Incadorcus

Grossi, Paschoal Coelho, 2011, Review of Incadorcus Arnaud & Bomans with the description of three new species from the Yungas of Peru and Bolivia (Coleoptera: Lucanidae: Lucaninae), Zootaxa 2750, pp. 1-14 : 2

Key to adults of Incadorcus species

Identification of males versus females: Male mandibles are strongly asymmetric and are as long as or longer than head length; female mandibles are almost symmetric, shorter than head length. The head of the males is as wide as both elytra; the female head is narrower than the width of both elytra. The external apex of the metatibiae is acute in males and truncate in females.

1 Surface color usually uniformly dark with no dark red areas at sides............................................. 2

- Surface color usually dark red, especially at sides of pronotum and elytra......................................... 3

2 Third interstriae appearing smooth, impunctate in basal half of disc. Female head and pronotum densely or moderately punc- tate.................................................................................. I. ashaninka sp. n.

- Third interstriae distinctly punctate in basal half. Females with head and pronotum finely punctate..................................................................................................... I. zugeri Arnaud & Bomans

3 Second and fourth interstriae shiny and costate; rest of elytra completely punctate; punctures setose with longer setae at elytral declivity...................................................................... I. damasoi Arnaud & Bomans

- All interstriae weakly shiny, flat, at most subcostate; punctures appearing glabrous but with short setae.................. 4

4 Third interstriae almost impunctate; if punctate, punctures fine. Temporal process not distinct in males.................. 5

- Third interstriae punctate; punctures moderate. Temporal process in males distinct ( Fig. 20 ) or not ( Fig. 21 )............. 6

5 Femora black. Male head moderately punctate and mandibles thick, head strongly rounded externally at base, external furrow deeply concave......................................................... I. shaunai Arnaud, Noguchi & Bomans

- Femora red. Male head finely punctate and mandibles slender, head weakly rounded externally at base, external furrow shal- low................................................................ I. cuzcoensis Arnaud, Noguchi & Bomans

6 Temporal process distinctly projected laterally. Third interstriae completely punctate, punctures moderate in size. Male mandi- bles with external furrow exceeding half of mandibular length......................... I. michellae Arnaud & Bomans

- Temporal process not projected laterally, simply rounded or almost absent. Third interstriae completely punctate or not. Male mandibles with external furrow exceeding half of mandibular length or confined to basal third....................... 7

7 Male mandibles with external furrow confined to basal third. Third interstriae not totally punctate; punctures ending at apex of basal third............................................................................ I. ayamaranus sp. n.

- Male mandibles with external furrow exceeding half of mandibular length. Third interstriae completely and uniformly punc- tate; punctures fine....................................................................... I. paulseni sp. n.

Figures

FIGURES 19 – 22. Mandibles, head and pronotum of male of Incadorcus species. 19 I. cuzcoensis. 20 I. michellae. 21 I. ayamaranus. 22 I. paulseni.