156 RHYNCHOPHORA. 
Species (no. 1) with gibbous, nodose elytra, and a broad exposed 
pygidium in the g, the latter produced into a long process on 
each side, the anterior femora bidentate . . . . . . + + 
Species (nos. 2-5) with gibbous, tuberculate or nodose elytra, the 
pygidium (so far as known) nearly or quite covered, the 
anterior femora bi- or unidentate Loe ees 
Species (nos. 6-10) with oval or oblong, more or less tuberculate 
or nodose elytra, the pygidium nearly or quite covered, the 
anterior femora bidentate. . . . o 6 ew . 
B. Elytra (except in A. annulipes) without elevations. 
Species (no. 11) of obovate form and large size, with very sparse 
pubescence, that on the elytra arising entirely from the crenate 
punctures of the striz, the elytra themselves strongly gibbous, 
with polished interstices, the anterior femora with a triangular 
tooth, the hind pair unarmed woe 
Species (nos. 12, 18) of oblong-ovate form, with a convex prothorax 
and somewhat gibbous or convex elytra, with dense mottled 
pubescence, stout legs, and a long triangular tooth to the 
anterior femora . Loe eee - 5 2 ew 
Species (no. 14) of oblong-obovate form, very shining, the elytra 
each with a large bare space on the disc and the rest of their 
surface pubescent, the anterior femora with a stout triangular 
tooth . . oe 6 eo ew ew ew 
Species (nos. 15, 16) of oblong or obovate form, very shining, black, 
with convex prothorax and gibbous elytra, the latter margined 
at the base and almost bare, a line of white pubescence in the 
depressed anterior part of the suture excepted, the anterior 
femora bi- or unidentate; general facies like that of Otido- 
cephalus .. . foe ee 
Species (nos. 17-19) of ‘oblong form, black, shining, resembling 
those of the 4. funereus-group, but with less convex elytra, the 
latter with white or greyish pubescence, sometimes arranged in 
interrupted lines, the basal margin raised, the suture pubescent 
at the base oe ee . . . 
Species (nos. 20, 21) of oblong or subovate form, bl ack or bronze- 
black, shining, with the elytra glabrous, or with small scattered 
patches of whitish pubescence, the scutellum densely white- 
pubescent, the elytra sometimes wneous, the anterior femora 
feebly unidentate * a 
Species (nos. 22, 23) of subovate form, black, shining, resembling 
A. mexicanus, but with more abundant pubescence on the elytra, 
often condensed into a small spot on the shoulders, the elytra 
sometimes brassy, the anterior femora feebly unidentate. . 
A. furcatus-group. 
A. flavirostris-group. 
A. sextuberculatus-group. 
A. crenatus-group. 
A. nigropictus-group. 
A. distigma-group. 
A. funereus-group. 
A. albolineatus-group. 
A. mexicanus-group. 
A. eneotinctus-group. 
* In one out of sixty specimens of A, mexicunus examined all the femora are simple. 
