4o8 Memoirs on the Coleoptera 



separated by narrow shining interspaces, the smooth median line 

 distinct and entire; elytra with the converging sides evenly and 

 notably arcuate throughout, the apex more acutely ogival than in 

 any of the preceding; sculpture nearly similar, the yellow squamules 

 rather longer and broader; beak in the female evenly arcuate, 

 moderately slender, gradually thicker basally, fully half as long as 

 the body, with the antennae inserted very slightly behind the middle. 

 Length (9) 4.6 mm.; width 1.8 mm. Mexico (State of Hidalgo). 



nugax 



Prothorax very distinctly wider than long, the basal lobe smaller, more 

 abruptly formed and narrowly rounded at tip 5 



5 — Sides of the prothorax converging and feebly arcuate, gradually 

 more so anteriorly to the distinctly tubulate and prolonged apex, 

 which is evidently less than half as wide as the base; punctures 

 rather strong and close, the median line evident and entire; elytra 

 nearly as in the preceding, but with the apex rather less sharply 

 ogival, two-fifths longer than wide, the striation and sculpture nearly 

 as in all the preceding forms; beak in the male thick, moderately 

 arcuate, feebly tapering and but little longer than the head and 

 prothorax, the antennae inserted evidently beyond the middle; ab- 

 domen in that sex only very feebly impressed medio-basally, the 

 impression clothed with scarcely different scales. Length (cf) 

 4.3-4.5 mm.; width 1.7-1.8 mm. Mexico (Temax, in northern 

 Yucatan), — Gaumer. Sent by Mr. Champion. Three specimens. 



logica 



Sides of the prothorax more parallel basally, more rapidly and strongly 

 rounded anteriorly to the less tubulate apex, which is half as wide 

 as the base, the punctures moderate in size, rather shallow and well 

 separated, the smooth median line sharply defined, even and entire; 

 elytra as in the preceding; beak in the male less thick than in the 

 preceding and slightly longer, almost half as long as the body, the 

 antennae inserted very slightly beyond the middle, the scape as 

 usual almost attaining the eye; abdomen in that sex barely per- 

 ceptibly impressed medio-basally and with the vestiture scarcely 

 differing. Length (cf) 4.5 mm,; width 1.9 mm. Mexico (Chil- 

 pancingo, in Guerrero), — Hoge. Communicated by Mr. Champion 

 under the name tonsilis Boh sparsella 



The male seems to be notably more abundant than the female 

 throughout this group of closely allied though recognizably different 

 forms. 



Stereogeraeus n. gen. 

 The type of this genus is Gerceus tenebricosus Chmp., of Guerrero, 

 Mexico, and it is separated from Centrinaspis and GercBus because 

 of marked habital peculiarities, residing in its large size, very stout 

 form, dense sculpture and tuberculate but not spiniform armature of 

 the prosternum in the male. The following species will also enter 



