Key to Basiceros species

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

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Basiceros

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

return to couplet #1

• 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

Basiceros militaris

• Crest medially emarginate and confluent at this point with median convexity of vertex .....Basiceros disciger

Basiceros disciger

3

return to couplet #1

• Mandible subtriangular, strongly bent ventrally and with the outer borders straight basally; anepisternum deeply depressed .....Basiceros scambognathus

Basiceros scambognathus

• Mandible triangular, not strongly bent ventrally, outer borders usually convex basally; mesopleura at the same level as the surrounding surface .....4

4

return to couplet #3

• 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

return to couplet #4

• 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

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

Basiceros convexiceps

6

return to couplet #4

• 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

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

Basiceros manni