Baring 433 



states that the dense thoracic scales are rounded but does not allude 

 in any way to the conspicuous white elongate squamules arising 

 from the strial punctures in the species mentioned. Our only 

 species having large and linearly suboval pronotal scales, have 

 these strial squamules distinct, excepting ockreosus, where they 

 become so small and slender as to be easily overlooked; but here, 

 the vestiture is brownish-yellow and not white as stated of larvatus. 

 The following Mexican species is of a common Sonoran type in 

 regard to form, sculpture and habitus, but the vestiture is longer 

 and more bristling: 



*Odontocorynus histriculus n. sp. — Oblong, moderately convex, black 

 throughout, feebly shining, the squamules of the upper surface slender, 

 white, much longer than usual, rather sparsely and uniformly distributed 

 and in part suberect and bristling; scales of the under surface large, 

 dense, white, oblong-suboval and closely decumbent as usual; beak in 

 the female smooth, minutely and sparsely punctate, coarsely at base, 

 cylindric, feebly tapering, arcuate and half as long as the body, the 

 antennae inserted just beyond the middle, the first two funicular joints 

 elongate, the first much the longer; prothorax short, not quite one-half 

 wider than long, the sides feebly converging and slightly arcuate, grad- 

 ually more rounding and oblique in fully apical third, the apex scarcely 

 at all constricted and half as wide as the base; punctures coarse, close 

 and subrugose, the median smooth line distinct and subentire but 

 irregular; basal lobe abrupt and broadly rounded as usual; elytra 

 broad, distinctly wider than the prothorax and almost twice as long, a 

 fifth longer than wide, the humeral swellings very moderate; sides very 

 slightly oblique and feebly arcuate; apex broadly and obtusely rounded; 

 grooves moderate, deep, the intervals coarsely and confusedly punctato- 

 rugose, alternating slightly and from two to three times as wide as the 

 grooves. Length (9) 4-0 mm.; width 1.9 mm. Mexico (Cuernavaca), 

 — Wickham. 



In the more northern series this species may be placed just after 

 pulverulentus and lulingensis, but the strial punctures are small 

 and obscure and do not bear slender squamules. 



The other Mexican species described below do not resemble any 

 of the more northern forms of the genus, being more elongate and 

 with sparser and more feeble vestiture and sparser sculpture. In 

 all but siibglaber and suhvittatus, where the thoracic apex is as in our 

 species, the sides of the more strongly tubulate apex are acutely 

 dentate; this is the condition in latiscapus Chmp., also, but here 

 the hair-like sparse vestiture is conspicuous, when compared with 

 the almost glabrous upper surface of Umatulus and vernicicollis. 



T. L, Casey, Mem. Col. IX, Feb. 1920. 



