Redescription of some South American species of Belonuchus (Coleoptera: Staphylinidae), with a checklist of the southern South American species of the genus

2011·0.49 MB·

by  Chani-Posse, Mariana

ISSN 0373-5680 (impresa), ISSN 1851-7471 (en línea) Rev. Soc. Entomol. Argent. 70 (3-4): 213-229, 2011 213
Redescription of some South American species
of Belonuchus (Coleoptera: Staphylinidae), with a
checklist of the southern South American species of the
genus
CHANI-POSSE, Mariana
Laboratorio de Entomología, Instituto Argentino de Investigaciones de las Zonas Aridas
(IADIZA, CCT CONICET-Mendoza), Casilla de Correo 507, 5500 Mendoza, Argentina;
e-mail: [email protected]
Redescripción de algunas especies sudamericanas de Belonuchus
(Coleoptera: Staphylinidae), con una lista de las especies del género
del sur de América del Sur
 ABSTRACT. Six species of Belonuchus Nordmann, 1837 from
South America are redescribed and illustrated: B. aluticollis (Bernhauer,
1921), B. castaneus Chani-Posse, 2006, B. flavicoxis (Bernhauer, 1912),
B. multipunctatus (Coiffait, 1981), B. richteri (Bernhauer, 1912) and B.
weiserianus (Bernhauer, 1921). A checklist of the 23 species of Belonuchus
currently known from southern South America is appended. A lectotype is
designated for B. richteri Bernhauer, 1922.
KEY WORDS. Belonuchus. Philonthina. Philonthus. South America.
Staphylininae. Taxonomy.
 RESUMEN. Seis especies de Belonuchus Nordmann, 1837, de
América del Sur se redescriben e ilustran: B. aluticollis (Bernhauer, 1921),
B. castaneus Chani-Posse 2006, B. flavicoxis (Bernhauer, 1912), B.
multipunctatus (Coiffait, 1981), B. richteri (Bernhauer, 1912) y B. weiserianus
(Bernhauer, 1921). Se provee una lista de las 23 especies actualmente
conocidas del sur de América del Sur. Se designa el lectotipo de B. richteri
Bernhauer, 1922.
PALABRAS CLAVE. Belonuchus. Philonthina. Philonthus. América del Sur.
Staphylininae. Taxonomía.
INTRODUCTION for more than 200 species at present
(Herman, 2001; Li & Zhou, 2010). Because
The genus Belonuchus Nordmann, 1837 most of its species are known to occur in the
belongs to the subtribe Philonthina in the Neotropical and Oriental regions, Smetana
subfamily Staphylininae. Although attempts (1995) has described the genus as primarily
have been made to elucidate its phylogenetic tropical. The number of species may change
relationships within the subtribe (Smetana, as poorly known tropical faunas are studied
1995), these have yet to be clarified (Smetana, and such studies are used to evaluate the
1995; Chani-Posse de Maus, 2008; Li & Zhou, current classification.
2010). The genus Belonuchus is distributed The geographical area covered in this
in all zoogeographical regions and accounts study, as in a previous work (Chani-Posse,
Recibido: 15-VI-2011; aceptado: 9-VIII-2011
214 Rev. Soc. Entomol. Argent. 70 (3-4): 213-229, 2011
2010), is the southern portion of South Naturales Bernardino Rivadavia, Buenos
America which comprises primarily the Aires, Argentina (Arturo Roig Alsina).
countries of Argentina, Chile, Paraguay and MLPA Museo de La Plata, La Plata,
Uruguay. According to Herman (2001), 16 Argentina (Analía Lanteri, Nora Cabrera).
species of Belonuchus are known to occur in NMPC National Museum (Natural
southern South America. Among these, nine History), Prague, Czech Republic (Jiři
species are known only from Argentina, six Hajek).
have a broader distribution in the Neotropical
region and one (B. rufipennis) is widely Preparation and examination of male
distributed in the New World. Newton (2008) and female genitalia follow Smetana (1982).
reported three more species of the genus Descriptions were made using a Leica MZ6
for southern South America: B. decipiens dissecting scope, and several genitalic
Sharp, 1876, B. haemorrhoidalis (Fabricius, features were examined with a Leitz Wetzlar
1801) and B. holisoides Sharp, 1876. As a compound microscope. Drawings were
result of recent studies on the southern South made with a camera lucida attached to the
American species of Philonthus Stephens, compound microscope or dissecting scope.
1829 (Coleoptera: Staphylinidae) and allied Photographs were taken using a digital
genera (Chani-Posse, 2006, 2010; Chani- camera attached to the dissecting scope.
Posse de Maus, 2008), five more species Measurements (given in millimeters) were
were transferred to Belonuchus: B. aluticollis made with an ocular micrometer. Overall
(Bernhauer, 1921), B. flavicoxis (Bernhauer, body length was measured from the apex of
1912), B. multipunctatus (Coiffait, 1981), B. the labrum to the apex of the abdomen. Other
richteri (Bernhauer, 1912) and B. weiserianus measurements were taken and abbreviated
(Bernhauer, 1921). as follows:
Furthermore, B. richteri (Bernhauer, HW- maximum head capsule width
1912) was found to be a senior secondary (including eyes)
homonym of B. richteri Bernhauer, 1922 and HL- length of head capsule, from anterior
a replacement name, Belonuchus castaneus, margin of frontoclypeus to neck constriction
was assigned to the latter species (Chani- (along midline)
Posse, 2006). PW- pronotum maximum width
The objectives of this study are to PL- pronotum length (along midline)
redescribe the six South American species EL- eye length (seen from above)
of Belonuchus - for which new valid names TL- temple length (from the posterior
were recently assigned (Chani-Posse, 2006, margin of the eye to the nuchal groove; seen
2010; Chani-Posse de Maus, 2008) - by from above)
incorporating new characters from external NW- neck maximum width
morphology, including genitalia and to S1- first segment of hind tarsus length
present a checklist of the 23 southern South S5- last segment of hind tarsus length
American species of the genus. EtL- elytra length at sides (from humerus
to apex; seen from above)
Etl-elytra length along suture
MATERIAL AND METHODS EtW-elytra width at base
Morphological terms mainly follow
The material studied was obtained on Smetana (1995) and Smetana & Davies
loan from the following collections: (2000) with slight modifications and/ or
FMNH Field Museum of Natural History, inclusions already detailed by the author in
Chicago, USA (Alfred F. Newton, Margaret K. previous studies (Chani-Posse, 2006; Chani-
Thayer). Posse de Maus, 2008).
IRSNB Institut Royale des Sciences The distribution given for each species is
Naturelles de Belgique (Yvonnick Gérard). based strictly on the examined specimens .
MACN Museo Argentino de Ciencias
CHANI-POSSE, M. Some South American Belonuchus 215
Genus Belonuchus Nordmann, 1837 tarsus as long as (B. aluticollis, B. flavicoxis)
to shorter than the front tibia, and the first
General remarks. The most recent tarsal segment as long as (B. weiserianus)
and complete description of the genus, to shorter than the second and third tarsal
at least for America north of Mexico, is segments combined. In any case, it must be
available in Smetana (1995). Li and Zhou noted that these characters are continuous,
(2010) also provide a complete diagnosis and as such, may give ambiguous results
and indicate the existence of two lineages when discretized by different authors (see
within Belonuchus, based on morphological also Chani-Posse, 2010).
differences in protarsi and genitalia: (1) Other characters common to the six
protarsi in both sexes dilated, with some species of Belonuchus here described
modified pale setae ventrally and paramere are the following: head with hind angles
of aedeagus well developed, usually with peg subangulate and at basal third as wide as
setae on underside of paramere; (2) protarsi distal third, with exception of B. castaneus;
in both sexes simple, not dilated, lacking antennae with segment 1 as long as segments
modified pale setae ventrally and paramere 2 and 3 combined, segment 4 elongate,
of aedeagus usually very small, without peg segments 9-10 transverse (Figs. 6, 14); eyes
setae on underside of paramere. According moderately to distinctly shorter than temples
to these authors, the former includes many (EL/TL= 0.8–0.4) seen from above (Figs. 1, 3,
Old World species and represents the genus 13, 19, 20); maxillary and labial palpi with
Trapeziderus Motschulsky, 1860, a current the last segment subcylindrical to fusiform,
synonym of Belonuchus that should be not acutely narrowed apically (Figs. 7, 15);
resurrected in the future, while the latter maxillary palpus with segment 2 longer than
represents the “true Belonuchus” erected by segment 3 (Figs. 7, 15); posterior arms of
Nordmann (1837). The reader must note that gular sutures joined before neck (Figs. 2, 4);
all available keys to the New World species of dorsal surface of pronotum with two rows of
the genus (e.g. Blackwelder, 1943; Smetana, punctures, each with five to eight punctures;
1995; Downie & Arnett, 1996; Newton et basisternum with medial longitudinal carina
al., 2000; Navarrete-Heredia et al., 2002) slightly developed; middle tarsus as long as
deal with Belonuchus sensu Nordmann. middle tibia; abdominal terga 2 and 3 with
Recognition. According to Smetana posterior basal line straight medially (Figs.
(1995), the genus can be recognized by the 1, 10, 11, 18); male sternum 7 with apical
combination of the following characters: margin straight; styli of tergum 9 simple,
last segment of labial palpus longer and moderately stout; sternum 8 with two long
narrower than segment 2; lateral puncture of subapical macrosetae at each side, with
pronotum bearing long macroseta separated exception of B. multipunctatus; tergum 10
from superior line of pronotal hypomeron with two subapical setae (Figs. 22, 27, 31,
by a distance at least three times as large 34, 38, 39); paramere entire and reduced,
as diameter of puncture (Fig. 8); front tarsus completely fused to median lobe (Figs. 23,
shorter than front tibia, first segment shorter 28, 33, 35; male unknown for B. richteri and
than segments 2 and 3 combined; first four B. weiserianus).
segments of front tarsus in both sexes simple,
not dilated, with ventral face bearing only
regular marginal setae (Figs. 1, 20); all tibiae RESULTS
spinose on lateral face; sternum 9 of male
genital segment with basal portion more Belonuchus aluticollis (Bernhauer, 1921)
or less asymmetrical and the paramere of (Figs. 1, 2, 21–25)
aedeagus without sensory peg setae.
Regarding the South American species Philonthus aluticollis „Bernhauer in litt.“;
here treated, the only characters to be Bruch, 1915: 444 (catalog). Nomen
modified from Smetana´s list are the front nudum.
216 Rev. Soc. Entomol. Argent. 70 (3-4): 213-229, 2011
Figs. 1-9. Belonuchus aluticollis. 1, Lectotype, male, dorsal view; 2, head, ventral view (GS= posterior
arms of gular sutures). B. castaneus: 3, head, dorsal view (D=distance separating medial interocular
punctures, d=distance separating medial punctures from lateral punctures); 4, head, ventral view (GS=
posterior arms of gular sutures), 5, pronotum (Dp=dorsal rows of punctures); 6, left antenna; 7, maxillary
and labial palpi; 8, head and pronotum, lateral view (Lp= lateral puncture of pronotum); 9, prosternum,
mesosternum and metasternum (in part) (CmR= circum- mesocoxal ridge).
Philonthus aluticollis Bernhauer, 1921: 107; identified by its head as long as wide, the
Scheerpeltz, 1933: 1332 (catalog); second antennal segment shorter than the
Blackwelder, 1944: 132 (list); Herman, following segment, the pronotum slightly
2001: 2747 (catalog); Chani-Posse, narrowed anteriad and the front tarsus as long
2004: 230 (list). as the front tibia. It differs from B. weiserianus
Belonuchus aluticollis; Chani-Posse, 2010: by the transverse distance between punctures
8, 9 (new combination). on elytra distinctly larger than the diameters
of punctures and the first segment of hind
Diagnosis. Belonuchus aluticollis may be tarsus as long as the last segment.
CHANI-POSSE, M. Some South American Belonuchus 217
Figs. 10-17. B. castaneus. 10, First three visible abdominal tergites. B. flavicoxis: 11, lectotype, female,
dorsal view; 12, elytra. B. multipunctatus: 13, head and pronotum, dorsal view (D=distance separating
medial interocular punctures, d=distance separating medial punctures from lateral punctures, Dp=dorsal
rows of punctures); 14, left antenna; 15, maxillary and labial palpi; 16, mesosternum and metasternum
(in part) (CmR= circum- mesocoxal ridge); 17, right elytrum.
punctures; distance separating medial
Redescription. Length of the body 7.5– interocular punctures on frons about three
7.8 mm. Coloration. Head and thorax times as large as distance separating medial
castaneous-brunneous to castaneous-piceous; punctures from lateral punctures; infraorbital
elytra castaneous-brunneous to castaneous; ridge present, reaching postgenal ridge;
abdominal segments castaneous to postmandibular ridge present. Antennae with
castaneous-piceous; antennae, palpi and segment 2 shorter than segment 3, segments
legs brunneous to castaneous-brunneous. 5-6 quadrate, segments 8-10 transverse.
Head as long as wide (HW/HL= 1.0) (Figs. Maxillary palpus with last segment 1.4–1.8
1, 2), about as wide as pronotum (HW/ times as long as preceding segment. Labial
PW= 0.92–1.02); dorsal surface coarsely palpus with last segment 1.4–1.8 times as
and moderately punctate, with four to six long as preceding segment. Neck no more
postocular punctures and four epicranial than 0.5 times as wide as head at widest
218 Rev. Soc. Entomol. Argent. 70 (3-4): 213-229, 2011
point (NW/HW= 0.5). female individual with additional labels:
Pronotum about as long as wide (PW/ “Philonthus aluticollis Bernh.” (in Bernhauer
PL= 0.95–1.0), slightly narrowed anteriad, handwriting), “Cotypus” (green label).
dorsal surface of pronotum with two rows Note: Chani-Posse (2010: 8) designated the
of punctures, each with five punctures (Fig. lectotype.
1). Basisternum with medial longitudinal
carina slightly developed. Metaventrite with Additional material examined.
circum-mesocoxal ridge broadly rounded ARGENTINA: Jujuy: Hornadita, 10.20,
medially. Elytra at sides moderately longer Weiser, 3400m, 2 males, one with additional
(EtL/PL=1.3) and at suture distinctly shorter pink label “cotypus”, Philonthus aluticollis
(Etl/PL=0.65) than pronotum at midline; det. Bernh (NMPC).
transverse distance between punctures
distinctly larger than diameters of punctures Belonuchus castaneus Chani-Posse 2006
(Fig. 1). Front tarsus as long as front tibia; first (Figs. 3–10, 26–29)
segment of hind tarsus as long as last segment
(S1/S5= 1.0). Abdominal terga moderately Belonuchus richteri Bernhauer, 1922: 15;
punctuate basally, distance separating Scheerpeltz, 1933: 1379.
punctures distinctly larger than diameters of Belonuchus castaneus Chani-Posse, 2006:
punctures; terga 2 and 3 with elevated area 366 [new name for richteri (Bernhauer,
between basal lines impunctuate, posterior 1922)].
basal line straight medially.
Male genitalia. Sternum 8 moderately Diagnosis. Belonuchus castaneus may
emarginate medio-apically. Sternum 9 be identified by the head wider than long,
moderately emarginate apically with three the transverse distance between punctures
long apical setae at each side (Fig. 21). on elytra about equal to the diameters of
Tergum 10 subtruncate medio-apically (Fig. punctures and the median lobe of aedeagus
22), with 2-6 short apical setae. Aedeagus gradually narrowed from the base of
with median lobe gradually narrowed from paramere. It differs from B. aluticollis and
apical third; apex of median lobe subacute B. flavicoxis by the eighth antennal segment
(in dorsal view) and straight in its apical quadrate, the pronotum longer than wide,
fourth (in lateral view) (Figs. 23, 24). the front tarsus shorter than the front tibia
Female genitalia. Tergum 10 similar to that and the distance between punctures on
of male. Second gonocoxite with one basal abdominal terga about equal to the diameters
strong seta and one long apical seta, without of punctures.
stylus (Fig. 25).
Redescription. Length of the body 6.2–6.8
Geographical distribution. Belonuchus mm. Coloration. Head castaneous-piceous;
aluticollis is currently only known from thorax and elytra castaneous; abdominal
northwestern Argentina (Jujuy). segments castaneous to castaneous-piceous;
antennae, palpi and legs testaceous-
Type material. Lectotype (Fig. 1), male, with brunneous to brunneous.
labels: “Iturbe/ 3700m”, “Jujuy/10.XI.919/ Head moderately wider than long (HW/
Weiser”, “aluticollis Bernh./ Typus” (yellow HL= 1.2) (Fig. 3), moderately wider than
label), “Chicago NHMus. /M. Bernhauer pronotum (HW/PW= 1.3); dorsal surface
Collection” “Lectotype Philonthus aluticollis coarsely and moderately punctate, with
Bernhauer, 1921/ Des. Chani-Posse de Maus four to six postocular punctures and four
2008” (FMNH). Paralectotypes: 1 male, 1 epicranial punctures; distance separating
female, with labels: “Jujuy/10.XI.919/ Weiser”, medial interocular punctures on frons about
“Cueva Iturbe/ 3700m”,“Paralectotype three times as large as distance separating
Philonthus aluticollis Bernhauer, 1921/ Des. medial punctures from lateral punctures
Chani-Posse de Maus 2008” (MACN); the (Fig. 3); infraorbital ridge present, reaching
CHANI-POSSE, M. Some South American Belonuchus 219
Figs. 18-20. B. richteri. 18, Pronotum, elytra and first two visible abdominal tergites; 19, head, dorsal
view. B. weiserianus: 20, lectotype, female.
postgenal ridge; postmandibular ridge and 3 with elevated area between basal
absent. Antennae with segment 2 shorter than lines punctuate, posterior basal line straight
segment 3, segment 5 elongate, segment 6-8 medially (Fig. 10).
quadrate, segments 9-10 transverse (Fig. 6). Male genitalia. Sternum 8 moderately
Maxillary palpus with last segment 1.4–1.8 emarginate medio-apically. Sternum 9
times as long as preceding segment (Fig. 7). slightly emarginate apically with one long
Labial palpus with last segment 1.4–1.8 times apical setae at each side (Fig. 26). Tergum
as long as preceding segment (Fig. 7). Neck 10 subtruncate medio-apically (Fig. 27),
no more than 0.5 times as wide as head at with 8-10 short apical setae. Aedeagus with
widest point (NW/HW= 0.4) (Fig. 3). median lobe gradually narrowed from base
Pronotum slightly longer than wide (PW/ of paramere; apex of median lobe subacute
PL= 0.9), slightly broadened anteriad, dorsal (in dorsal view) and straight in its apical
surface of pronotum with two rows of fourth (in lateral view) (Fig. 28).
punctures, each with six punctures (Fig. 5). Female genitalia. Tergum 10 similar to that
Basisternum with medial longitudinal carina of male. Second gonocoxite with 2–5 strong
slightly developed (Fig. 9). Metaventrite with setae along its outer margin, and stylus with
circum-mesocoxal ridge broadly rounded two long apical setae (Fig. 29).
medially (Fig. 9). Elytra at sides moderately
longer (EtL/PL=1.2) and at suture distinctly Geographical distribution. Belonuchus
shorter (Etl/PL=0.7) than pronotum at midline; castaneus is currently known from Argentina
transverse distance between punctures about and Brazil (new record).
equal to diameters of punctures. Front tarsus
shorter than front tibia; first segment of hind Type material. Lectotype, male, with labels:
tarsus as long as last segment (S1/S5= 1.0). “Rep. Argentina / PROV. MISIONES / RICHTER
Abdominal terga moderately punctuate / 19”, “richteri Bernh. / Typus” (yellow
basally, distance separating punctures about label), “Chicago NHMus. / M. Bernhauer
equal to diameters of punctures; terga 2 Collection”, “Lectotype Belonuchus richteri
220 Rev. Soc. Entomol. Argent. 70 (3-4): 213-229, 2011
Figs. 21-40. Belonuchus aluticollis. 21, Sternum 9; 22, tergum 10, male; 23, aedoeagus, dorsal view;
24, aedoeagus, lateral view; 25, gonocoxites of female genital segment. B. castaneus: 26, sternum
9; 27, tergum 10, male; 28, aedoeagus, dorsal view; 29, gonocoxites of female genital segment. B.
flavicoxis: 30, sternum 9; 31, tergum 10, male; 32, aedoeagus, dorsal view; 33, aedoeagus, lateral
view. B. multipunctatus: 34, tergum 10, male; 35, aedoeagus, dorsal view; 36, gonocoxites of female
genital segment. B.richteri: 37, gonocoxites of female genital segment; 38, tergum 10. B. weiserianus:
39, tergum 10; 40, gonocoxites of female genital segment.
CHANI-POSSE, M. Some South American Belonuchus 221
Bernhauer, 1922 / Des. Chani-Posse on elytra distinctly larger than the diameters
2011”. (FMNH). Paralectotypes: one male of punctures.
and one female, “Rep. Argentina / PROV.
MISIONES / RICHTER / 19”, “richteri Berh. Redescription. Length of the body 6.2 mm.
/ Cotypus” (yellow label), “Chicago NHMus. Coloration. Head, thorax and abdomen
/ M. Bernhauer Collection”, “Paralectotype castaneous-brunneous; elytra castaneous-
Belonuchus richteri Bernhauer, 1922 / Des. piceous; antennae, palpi and legs
Chani-Posse 2011” (FMNH). brunneous.
Notes: Although the type locality and both Head moderately wider than long (HW/HL=
male and female characters are given in the 1.2) (Fig. 11), about as wide as pronotum
original description, there is no indication (HW/PW= 1.1); dorsal surface coarsely and
about how many specimens were examined moderately punctate, with three postocular
by Bernhauer (1922). All the specimens here punctures and two to three epicranial
studied agree with the original description. Of punctures; distance separating medial
them, the male individual in better condition interocular punctures on frons about three
is the lectotype hereby designated. times as large as distance separating medial
punctures from lateral punctures; infraorbital
Additional material examined. Twelve ridge present, reaching postgenal ridge;
specimens (4 males, 3 females, 5 unsexed). postmandibular ridge absent. Antennae with
ARGENTINA: Misiones: Richter, in segment 2 shorter than segment 3, segment
green card „Cotypus“, Bernhauer determ., 5 elongate, segment 6 quadrate, segments
in Bernhauer handwriting „Philonthus 8-10 transverse (Fig. 11). Maxillary palpus
richterianus Brnh.“, 5 (MLPA); C. Richter, with last segment 1.4–1.8 times as long as
in Bernhauer handwriting „tenebrosus B“ preceding segment. Labial palpus with last
det. Bernhauer, Museo Pragense, Chicago segment 1.4–1.8 times as long as preceding
NHMus Bernhauer Collection, 1male segment. Neck no more than 0.5 times as
(FMNH). BRAZIL: Sao Paulo: Mraz LGT, wide as head at widest point (NW/HW= 0.4)
Museo Pragense, Chicago NHMus Bernhauer (Fig. 11).
Collection, 3 males, 3 females (FMNH). Pronotum about as long as wide (PW/PL= 1.0),
slightly broadened anteriad, dorsal surface of
Belonuchus flavicoxis (Bernhauer, 1912) pronotum with two rows of punctures, each
(Figs. 11, 12, 30–33) with six punctures. Basisternum with medial
longitudinal carina slightly developed.
Philonthus flavicoxis Bernhauer, 1912: 43; Metaventrite with circum-mesocoxal ridge
Bernhauer and Schubert, 1914: 338 narrowly rounded medially. Elytra at sides
(catalog); Bruch, 1915: 444 (catalog); moderately longer (EtL/PL=1.3) and at suture
Blackwelder, 1944: 133 (list); Herman, distinctly shorter (Etl/PL=0.7) than pronotum
2001: 2823 (catalog); Chani-Posse, at midline; transverse distance between
2004: 230 (list). punctures distinctly larger than diameters
Belonuchus flavicoxis; Chani-Posse, 2010: of punctures (Fig. 12). Front tarsus as long
8, 9 (new combination). as front tibia; first segment of hind tarsus as
long as last segment (S1/S5= 1.0). Abdominal
Diagnosis. Belonuchus flavicoxis may be terga moderately punctuate basally, distance
identified by the pronotum as long as wide, separating punctures distinctly larger
the eighth antennal segment transverse, the than diameters of punctures; terga 2 and
front tarsus as long as the front tibia and the 3 with elevated area between basal lines
median lobe of aedeagus gradually narrowed impunctuate, posterior basal line straight
from its apical fourth. It differs from B. medially (Fig. 11).
castaneus by the circum-mesocoxal ridge of Male genitalia. Sternum 8 moderately
metaventrite narrowly rounded medially and emarginate medio-apically. Sternum 9
the transverse distance between punctures deeply emarginate apically with two long
222 Rev. Soc. Entomol. Argent. 70 (3-4): 213-229, 2011
apical setae at each side (Fig. 30). Tergum segments castaneous-brunneous, other
10 subtruncate medio-apically (Fig. 31), segments castaneous-piceous, palpi and legs
with 2-6 short apical setae. Aedeagus with castaneous-brunneous.
median lobe gradually narrowed from apical Head distinctly wider than long (HW/HL=
fourth; apex of median lobe subacute (in 1.4) (Fig. 13), about as wide as pronotum
dorsal view) and straight in its apical fourth (HW/PW=1.1); dorsal surface coarsely
(in lateral view) (Figs. 32, 33). and moderately punctate, with four to
Female genitalia. Unknown. six postocular punctures and five to six
epicranial punctures; distance separating
Geographical distribution. Belonuchus medial interocular punctures on frons about
flavicoxis is currently only known from three times as large as distance separating
northwestern Argentina (Tucumán). medial punctures from lateral punctures
(Fig. 13); infraorbital ridge present, reaching
Type material. Lectotype, female, postgenal ridge; postmandibular ridge
with labels: “Rep. Argentina/ Prov. present. Antennae with segments 2 and 3
Tucumán/20.1.1908/ C. Bruch”, “flavicoxis subequal in lenght, segment 5 elongate,
Bernh./ Typus” (yellow label), “Chicago segment 6 quadrate, segments 7-10 transverse
NHMus. /M. Bernhauer Collection” (Fig. 14). Maxillary palpus with last segment
“Lectotype Philonthus flavicoxis Bernhauer, slightly longer than preceding segment (Fig.
1912/ Des. Chani-Posse de Maus 2008” 15). Labial palpus with last segment slightly
(FMNH). longer than preceding segment (Fig. 15).
Note: Chani-Posse (2010: 8) designated the Neck more than 0.5 times as wide as head at
lectotype. widest point (NW/HW= 0.6) (Fig. 13).
Pronotum slightly longer than wide (PW/
Belonuchus multipunctatus (Coiffait, PL= 1.1), slightly broadened anteriad, with
1981) anterior angles subrectangular, dorsal surface
(Figs. 13–17, 34–36; Figs. 17–21 in Chani- of pronotum with two rows of punctures, each
Posse de Maus, 2008) with eight punctures (Fig. 13). Basisternum
with medial longitudinal carina slightly
Endeius multipunctatus Coiffait, 1981: 297; developed. Metaventrite with circum-
Herman 2001: 2584. mesocoxal ridge broadly rounded medially
Belonuchus multipunctatus; Chani-Posse de (Fig. 16). Elytra at sides moderately longer
Maus, 2008: 386 (new combination). (EtL/PL= 1.3) and at suture distinctly shorter
(Etl/PL= 0.65) than pronotum at midline;
Diagnosis. Belonuchus multipunctatus may transverse distance between punctures
be identified by its head distinctly wider than distinctly larger about equal to diameters of
long, the antennal segments 7-10 transverse, punctures (Fig. 17). Front tarsus shorter than
and the distance separating punctures on front tibia; first segment of hind tarsus as long
abdominal terga distinctly larger than the as last segment (S1/S5= 0.8). Abdominal
diameters of punctures. It differs from other terga moderately punctuate basally, distance
Belonuchus species by the last segment of separating punctures distinctly larger than
both maxillary and labial palpi not more diameters of punctures; terga 2 and 3 with
than slightly longer than the preceding elevated area between basal lines punctuate,
segment and the anterior angles of pronotum posterior basal line straight medially.
subrectangular. Male genitalia. Sternum 8 deeply emarginate
medio-apically and three long subapical
Redescription. Length of the body 7.9– macrosetae at each side. Sternum 9 slightly
9.8 mm. Coloration. Head castaneous- emarginate apically with three long apical
piceous to black; thorax castaneous; elytra setae at each side. Tergum 10 subangulate
brunneous; abdomen castaneous-piceous medio-apically (Fig. 34), with 8-10 short
to brunneous apically; first three antennal apical setae. Aedeagus with median lobe