Key to Basiceros species

Key based on Feitosa et al (2007). Covers all the described species.

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1

 * Occipital margin of head rounded, forming a continuous or nearly continuous raised crest.......... 2
 * Occipital margin of head trapezoidal or subrectangular, not forming a continuous crest........... 3

2

 * In full-face view, crest continuous around posterior part of vertex and separated from median convexity of vertex by a broad, uninterrupted sulcus parallel to the crest .....Basiceros militaris
 * Crest medially emarginate and confluent at this point with median convexity of vertex .....Basiceros disciger

3

 * Mandible subtriangular, strongly bent ventrally and with the outer borders straight basally; anepisternum deeply depressed .....Basiceros scambognathus
 * Mandible triangular, not strongly bent ventrally, outer borders usually convex basally; mesopleura at the same level as the surrounding surface..... 4

4

 * Head nearly as broad as long with the occipital lobes rounded; in frontal view, intermandibular space much shorter than the half length of mandibles; gaster with few specialized hairs longer than the basal pilosity.................................... 5
 * Head distinctly longer than broad with the occipital lobes angulated; in frontal view, intermandibular space broad, with about half length of the mandibles; gaster densely covered with specialized hairs longer than the basal pilosity ............ 6

5

 * Petiolar node and postpetiole totally covered with dense pilosity; petiolar node well developed and subrectangular in dorsal view; ventral carina of petiole with many developed teeth of different shapes .....Basiceros conjugans
 * Petiolar node and postpetiole weakly covered with pilosity; petiolar node subcylindrical in dorsal view to almost obsolete; ventral carina of petiole with a single developed tooth at the anterior portion of peduncle .....Basiceros convexiceps

6

 * Basal portion of mandibles with dense pilosity formed by whitish squamiform hairs; ventral carina of petiole with a short edge at the anterior portion of peduncle .....Basiceros singularis
 * Basal portion of mandibles smooth and shiny; ventral carina of petiole with a well developed edge at the anterior portion of peduncle, followed by smaller denticles of different shapes .....Basiceros manni