June, xs 9 8.] Casey : North American Coleoptera. 71 
apical processes long and obliquely convergent; surface with the usual isolated 
tubercles toward base. Elytra twice as long as wide, just visibly wider than the 
prothorax, the apical declivity flattened, becoming alutaceous in lustre and 
almost impunctate toward the suture, which is elevated Female — Similar to 
* the male but larger, with the thoracic processes short and parallel, the elytra 
rather more than twice as long as wide and more distinctly wider than the pro¬ 
thorax, the apical declivity convex and coarsely perforato-pucctate throughout,, 
the suture moderately elevated. Length 13.0-15.5 mm.; width 4.3-5.1 mm. 
Texas (El Paso). robustus, sp. nov. 
Vertex more tumid and convex, less finely and quite strongly punctured throughout; 
abdomen strongly though sparsely punctured toward base ; thoracic processes 
more approximate, separated by but little more than a fourth of the total width. 
Female. —Plead moderate in size, the eyes very convex and prominent as usual. 
Prothorax not quite as long as wide, nearly as in robustus but less devoid of 
sculpture toward the basal angles. Elytra not at all mere than twice as long as 
wide, the apical declivity rather more convex at each side than in robustus , 
steeper and a little less coarsely punctured. Abdomen polished as usual, the 
punctures becoming finer and denser toward apex. Length 12.5 mm.; width 
4.3 mm. Arizona (Locality not specified—Levette Cabinet.) 
puncticeps, sp. nov. 
The male of fortis has the apical processes more convergent and 
longer than the female, but there seems to be no modification of the 
elytral declivity near the suture. Individuals vary much in size as usual 
in the Bostrichinse. 
Bostrichus Geoff. 
The genus Bostrichus , as represented in America, differs remark¬ 
ably from Amphicerus in the structure of the antennal club, the joints 
being short, subglobose, and with the sensitive spaces small and circu¬ 
lar ; it also differs in having the basal angles of the prothorax acute and 
prominent, but in that respect resembles Apatides, from which it differs 
in turn in the structure of the antennal club and frontal parts of the 
head. The following table comprises all the species known to me at 
present: — 
Prothorax narrowly and deeply sinuate at apex, with the limiting processes promi¬ 
nent and generally unciform ; elytra each with two ridges more or less distinct 
or interrupted.. 
Prothorax sinuato-truncate at apex, with the limiting angles acute and somewhat 
prominent; vestiture hair-like, decumbent and unevenly distributed; elytra 
without trace of ridges ; species smaller and more slender.5 
2 Hind tarsi fully as long as the tibiae ; unciform processes of the prothorax more 
prominent. Atlantic regions.3 
Hind tarsi shorter than the tibiae ; unciform processes shorter, not differing in form 
irom the lateral sen ules. ± 
