A new Brazilian stag beetle of the genus Sclerostomus Burmeister, 1847 (Insecta: Coleoptera: Lucanidae) Author Grossi, P. C. Author Racca-Filho, F. text Zootaxa 2004 575 1 4 journal article 10.5281/zenodo.157255 62267587-8845-4a4e-8492-12b4c1fd328c 1175­5326 157255 207973C1-A69F-466E-98F7-1E63D4772842 Sclerostomus ( Altitatiayus ) trifurcatus , new species Material examined. Holotype : male, Brasil , MG, Passa Quatro, Serra Fina, Trilha da Boca do Lobo, 2800 m , 07­XI­1999 , R. Koike col. Ex col. E. & P. Grossi deposited in Museu Nacional do Rio de Janeiro, Universidade Federal do Rio de Janeiro, Brazil . Description. Male: 16 mm in length, 6 mm wide. Body elongate­oval and convex ( Fig. 1 ); glabrous and black dorso­ventrally. Head broad, rectangular, excavated in the middle from vertex to the frontal border; posterior lateral borders elevated, spherical in shape; frontal border sinuate; canthus with anterior concavity, covering less than half of the eyes; frons with a conspicuous tubercle. Antennae with the scape weakly arched and the pedicel small. (Specimen lacking the antennal clubs.) Mandibles fully upturned, trifurcate apically. Lower portion of the mandible with a flat tooth basally, presenting above a bifurcate apophysis. The basal tooth of mandible median and acute ( Figs. 2 and 3 ). Labrum triangular with a small tooth laterally; labium granulose, convex and setose with marginal punctures anteriorly. Pronotum smooth, bordered all around, weakly convex; anterior border elevated towards the middle with a minute central dent. Protibiae sparsely setose with four teeth externally. Meso and metatibiae with one external spine at the middle. Elytra convex and finely punctured, with eight longitudinal striae, with coalescent punctures basally. FIGURE 1 . Sclerostomus ( Altitatiayus ) trifurcatus n. sp . , male, dorsal view (scale 5 mm) FIGURE 2 . Sclerostomus ( Altitatiayus ) trifurcatus n. sp . , male, lateral view (scale 5mm). FIGURE 3 . Sclerostomus ( Altitatiayus ) trifurcatus n. sp . , right mandible, left view (scale 1 mm). Female: unknown. Etymology. The specific epithet refers to the trifurcate mandibles, which are unique in the genus and readily distinguish it from other species of Sclerostomus . Discussion. The new species can be easily distinguished from other Sclerostomus species by the apical trifurcate mandibles and by the presence of a conspicuous tubercle on the frons.