Hybochaetodus flaco Ocampo, 2002

Ocampo, Federico C., 2002, A New Species Of Hybochaetodus Arrow (Coleoptera: Scarabaeoidea: Hybosoridae: Anaidini) From Peru, The Coleopterists Bulletin 56 (3), pp. 446-450 : 448-450

Hybochaetodus flaco Ocampo , new species

Figs. 1 , 2 , 4, 5

Type Material. Holotype male labeled: ‘‘ Peru: Cusco: Esperanza /138109390S 718369150W/ Elfin forest , ca. 2,900 m / pitfall human dung/ T. Larsen, XI-10-11, 1999;’’ my red holotype label: ‘‘ Hybochaetodus flaco / HOLOTYPE /F. C. Ocampo.’’ Genitalia in glycerin-filled vial beneath specimen. Holotype deposited in the United States National Museum , Washington D.C. ( USNM) .

Holotype. Male. Length 9.00 mm; width 4.37 mm. Color: Reddish-brown. Head: Frons in dorsal view with base slightly concave in middle; surface punctate in middle, rugose on sides. Frontoclypeal suture obsolete. Clypeal shape subtrapezoidal, apex weakly rounded, surface punctate; punctures moderately dense, large. Clypeal margins not reflexed, vertical surface of apex blunt. Labrum rounded, apex slightly indented; dorsal surface with fringe of setae; lateral margins rounded. Mandibles protruding beyond labrum; external surface sculptured, sparsely setose; apex acute, slightly reflexed; scissorial area with small, preapical tooth. Labium with apex of mentum slightly indented, surface sparsely setose. Antennal club with basal segment cupuliform, capable of receiving penultimate and ultimate segments. Pronotum: Surface convex, 0.7 times as long as wide, surface punctate in middle, rugose on sides; punctures moderately dense ( Fig. 1 ). Base with fovea in middle. Anterior margin with weak bead; lateral margins arcuate, weakly denticulate at apex; posterior margin sinuous. Anterior angles acute; posterior angles nearly right-angled. Scutellum: Shape triangular, surface moderately setose, apex acute. Ely-

THE COLEOPTERISTS BULLETIN 56(3), 2002 449

(4, 6) lateral and (5, 7) ventral views.

tron: Elongated, apex weakly acute; surface with 12 striae; interval with v-shaped surface ( Fig. 1 ); intervals 4 and 7 slightly carinate. Disc with 1 lateral, longitudinal carina; carina extends from humerus to declivous area. Lateral margin weakly denticulate. Epipleuron shagreened, equal in width from humeral angle to 2/3 length, apex tapered. Hind wing: Reduced, obsolete. Venter: Prosternal surface transversely strigulate; prosternal shield with posteriomedial process poorly developed. Meso- and metasternal surface strigulate. Proepisternal surface strigulate. Abdominal sternites transversely strigulate. Legs: Procoxal surface strigulate. Metatrochanter with posteriomedial tooth absent. Femoral surface vermiculate to strigulate, sparsely setose. Protibia with 3 teeth and small denticles on outer margin; basal and middle teeth subtriangular; dorsal surface with 2 setose, longitudinal carinae; protibial spur as long as apical tooth, curved at apex, apex acute. Pro-, meso-, and metatarsomeres 1 longer than 2 and protarsomere 1 with small ventral tooth; tarsomeres 2–4 subequal in length; tarsomere 5 longer than 4. Pro-, meso-, and metatarsal claws shorter than tarsomeres 5, simple, curved. Meso- and metatibiae slender, outer surface with 2 longitudinal rows of teeth, teeth small, 1 seta at base of each tooth. Meso- and metatibial apex with 1 poorly developed spine on outer margin. Meso- and metatibial medial spur longer than external spur, mesotibial external spur with apex blunt, medial spur with apex acuminate. Parameres: ( Figs. 4–5 ).

Diagnosis. This species is distinguished from H. obscurus Arrow by the presence of the elytral carina and by the nearly right-angled pronotal posterior angles ( Fig. 1 ), ( H. obscurus lacks elytral carinae and its posterior angles are rounded). The shape of the parameres is also diagnostic ( Figs. 4–7 ).

Distribution. Cusco, Peru.

Etymology. From the Spanish flaco , meaning slender; in reference to the narrow body form of this species.

Remarks. The biology of this species is unknown. The specimen on which this description is based was collected at a pitfall trap baited with human dung. Label

450 THE COLEOPTERISTS BULLETIN 56(3), 2002

data indicate that the specimen was found in elfin forest at 2,900 m elevation.

Hybochaetodus flaco is only known from the type locality where it occurs in sympatry with H. obscurus .

Figures

Fig. 1. Habitus of Hybochaetodus flaco Ocampo, new species, from Peru.

Figs. 2, 3. Metasterna. 2) Hybochaetodus; 3) Anaides.

Figs. 4–7. Male parameres and phallobase. 4, 5) Hybochaetodus flaco; 6, 7) H. obscurus;