8(7') Sides of male basal plate slightly convergent towards apex, with distinct
 protuberance at the apex (Fig. 6-23); median lobe as in Figs. 6-21 and 6-22 ..........
 ..................................b........ ........... Cybocephalus nigritulus LeConte

8' Sides of male basal plate parallel, with a gradual and weakly discernible
 protuberance at the apex (Fig. 6-15); median lobe as in Figs. 6-13 and 6-14 ..........
 ..................................C............... ...... .. Cybocephalus new species 2

9(7') Male basal plate evenly rounded at apex (Fig. 6-10); when viewed laterally the
 median plate on the median lobe is very elevated (Fig. 6-9); median lobe as in
 Fig. 6-8 ............... ............. ....... ............Cybocephalus californicus Horn

9' Male basal plate with a wide, flat apex (Fig. 6-32); when viewed laterally the
 median plate on the median lobe is not elevated (Fig. 6-31); median lobe as in
 Fig. 6-30................................. ........ .......... .... Cybocephalus schwarzi Champion

 Cybocephalus Erichson 1844

Cybocephalus Erichson 1844: 441-442.

 For a description of the genus, see Smith and Cave (2006a).

 Cybocephalus aciculatus Champion

 (Figs. 6-1, 6-11)

Cybocephalus aciculatus Champion 1913: 71.

 Diagnosis. Male and female are black but with a matte-like appearance. The

terminal club antennomere is rounded (Fig. 6-1), separating this species from all other

Mexican Cybocephalus except C. randalli. This species differs from C. randalli by the

greasy sheen on the head and pronotum, larger eyes with many more ommatidia than C.

randalli, and the antennal club smaller than the eye.

 Redescription. Female. Form: Elongate oval; contractile; strongly convex

dorsally. Length: 1.2-1.3 mm (measured from apex of clypeus to apex of elytra);

breadth: 0.85-0.90 mm (measured across elytral humeri). Color: Head, thorax, elytra

and underside black, lateral margin of pronotum and posterior margin of elytra yellowish

and translucent; legs and antennae brown or black. Head: Broad and convex with a