Incadorcus paulseni Grossi, new species

Incadorcus paulseni Grossi new species

(Figs. 14, 22, 30, 38)

Type material. Holotype male, FMNH labeled: a) “ BOLIVIA: Dept. / Cochabamba, Prov. / Carrasco, Serrania de / Siberia, Chua Khocha, / 3.IX.1990 ”; b) “ FMNH #90-205, cloud / Forest, 2300 m, / bromeliad sp.3, / M. Ledezma, No.132 / FIELD MUSEUM”; c) red label “ Incadorcus paulseni (3) / Grossi / HOLOTYPE ”.

Description, holotype male (Fig. 14). Length: 13.8 mm. Width: 5.1 mm. Color: Ocular canthus and sides of pronotum and elytra dark red; longitudinal middle of body, mandibles, head, legs and venter black. Head: Shape transverse, about 1.7 x wider than long. Surface moderately punctate; punctures fine, becoming bigger near lateral and posterior margins. Anterior margin with sides moderate produced, rounded, straight medially. Canthus widely rounded, internally concave; extending 1/3 of eye length in dorsal view. Temporal process weakly developed, almost imperceptible. Mandibles shorter than head, robust and slightly incurved. Dorsal carina reaching apex, straight; lateral furrow with ½ of mandibular length, apically narrower. Left mandible with external side sinuous at middle and rounded basally; apical subtriangular internally expanded tooth moderately developed, with internal margin with no tooth, simply straight; posteriorly with a small concavity and with a dorsal carina, carina extending until basal tooth. Medially below carina with an acute tooth, basal tooth quadrate. Right mandible almost disarmed; apically straight weakly laminate; near middle with three conjoined rounded teeth, increasing in size to base; near base with acute subtriangular tooth; basal tooth rounded. Pronotum: Surface shiny, moderately punctate, denser punctation posteriolaterally; punctures fine to moderate sized. Anterior angles acute, margin narrow and carinate. Lateral angles rounded; posterior angles straight, appearing acute. Elytra: Integument surface smooth and shiny. From elytral suture to side with 6 distinct striae, after 6th stria completely punctate; punctures fine to moderate. First to 4th interstriae sparsely punctate; punctures fine. Fifth interstria with moderate punctures. Second interstria subcostate. Third interstria near 4th stria with a longitudinal, line-shaped furrow. Fourth interstriae with a somewhat oblique, line-shaped furrow. Humerus rounded. Epipleuron flattened from middle to apex with scattered elongated yellowish-white setae. Legs: Protibiae with 9–10 external acute teeth, increasing in size to apex. Mesotibiae with 1 well-developed tooth after external middle. Metatibiae with 1 small tooth after external middle. Genitalia: Genital capsule simple. Aedeagus symmetric (Fig. 38). Basal piece 1.5 times longer than paramere length. Parameres distally rounded; median lobe with subparallel sides, longitudinal middle slightly convex, apex almost completely concave. Everted internal sac shorter than parameres and basal piece together with paired strap-like sclerites almost reaching apex, darker and wider apically; apex of internal sac darkened, bulbous and with a distal tubular expansion with gonopore situated at apex.

Epithet. The specific epithet is in homage to M. J. Paulsen, a specialist on New World Lucanidae and friend, who brought this new species to my attention.

Remarks. This is the second known species from Bolivia, and the one with the southernmost distribution within the genus. The mandibular shape is unique with the left mandibular apical tooth completely straight, with no tooth at its internal margin. Incadorcus paulseni resembles I. cuzcoensis, from which it can be distinguished by the mandibular shape, less punctate body and male genitalia. Both species have a dark red ocular canthus. This species is only known from the holotype, which was purportedly collected under an indeterminate species of bromeliad. This is the only recorded natural history data for the genus.