94 MEMOIRS ON THE COLEOPTERA 



punctate, the eyes large but not very prominent; antennae very short, the 

 club large and subglobular; prothorax quadrate, fully as long as wide, the 

 apex slightly wider than the base; sides nearly straight and even, but 

 becoming faintly crenulate basally; surface broadly and feebly impressed 

 medially, except at base, and not densely punctate, more coarsely and 

 closely so at the sides; elytra truncate at tip, three-fifths longer than wide 

 and but just visibly wider than the prothorax in both sexes, the parallel 

 sides very feebly arcuate; striae fine and very finely punctate, obsolete 

 toward the suture and on the flanks, where they are represented simply 

 by the series of punctures; pygidium rather longer than wide and almost 

 half as long as the elytra, loosely punctate, the terminal segment (cf ) 

 rather small; abdomen reticulate but almost completely impunctate, the 

 last segment broadly arcuato-truncate in the male and feebly punctate, 

 the post-coxal plaques elongate, triangular and rather feeble. Length 

 9 ) 1.45-1.58 mm.; width 0.33-0.38 mm. Illinois. 



Differs from striatus Lee., in its still smaller size, shorter and less 

 apically blackish elytra, less arcuate sides of the prothorax anteriorly, 

 more truncate and less punctured fifth ventral of the male and in 

 several other characters. 



Europs Woll. 



This genus, while resembling certain others of the family, such as 

 Hesperobcsnus, in external habitus, is well distinguished by the acute 

 intercoxal process of the abdomen, this being broadly obtuse in all 

 the other genera. Sexual differences in the size and form of the 

 head become rather more pronounced here than elsewhere in the 

 family, and I have at hand a male and female from Havana, Cuba, 

 taken by Baker, in which these differences become extreme, the 

 female being smaller, much more slender and parallel and with 

 relatively very much smaller head than the male. The female fits 

 rather well Chevrolat's description of his Rhizophagiis cubensis, 

 the dark apex of the elytra, not mentioned in the description, being 

 less pronounced in the female than in the male and in the types of 

 the author was probably a feature too feeble to attract attention. 

 Chevrolat uses the language "vage punctato," referring to the 

 pronotum ; the punctures are rather small and sparse but deep and 

 sharply defined, and agree with the expression used, being rather 

 irregularly scattered. 



The following species is widely distinct from pallipennis Lee., 

 and I cannot recognize it among the numerous Mexican species 

 defined by Sharp: 



