Coleopterological Notices, IV. 427 



is proposed below, fifteen species are now brought to notice ; prob- 

 ably many more still remain unknown. Mexico appears to be the 

 principal focal centre of Otidocephalus, and, although well repre- 

 sented in Brazil, the genus would seem to be relatively less abun- 

 dant there, being largely replaced by Erodiscus. 



The species are readily subdivided into well-marked groups based 

 upon femoral, rostral and ungual structure, size of the eyes and 

 nature of the vestiture as follows: — 



Beak without dorsal excavation; femora dentate 2 



Beak with a large and very deep excavation near the middle ; femora un- 

 armed 9 



2 — Tarsal claws with a large, acutely angulate, internal lobe ; body with erect 

 setae 3 



Tarsal claws broadly swollen within toward base, but not at all angulate ; 

 body entirely without erect setse 8 



3 — Elytra with more or less dense recumbent vestiture in addition to the erect 

 sette, the pubescence tufted in structure 4 



Elytra with sparser recumbent or subrecumbent and paler hairs, simjile in 

 structure and always confusedly distributed over the surface 5 



Elytra with stiff erect white setcne, intermingled with longer, more slender, 

 blackish hairs, all forming single series on the intervals 6 



Elytra with simple erect seta?, either black or whitish in color, forming single 

 series on the intervals 7 



4 — Elytra each with four glabrous or subglabrous vitta?. 



Vittae narrow and sharply defined, with a few scattered tufts only near the 



apex 1 TittatU8 



Vittse much wider, always with unevenly scattered pubescent tufts through- 

 out the length, punctured and indefinitely limited ; body smaller and 

 relatively stouter 2 nivosiis 



Elytra without four subglabrous vittse. 



Pubescence moderately dense, paler along the elytral suture and median 



line of the pronotum 3 tilkei 



Pubescence uniform in color throughout the upper surface, pale brownish- 

 cinereous, broadly dense on the elytral intervals, but denuded in a narrow 

 space on eacli side of the series of punctures, producing a multi-vittate 

 appearance ; dorsal setae very short 4 iiisigllis 



5 — Elytra without well-defined series of punctures, confusedly and unevenly 

 punctate throughout 5 estriatlis 



Elytra with impressed even series of coarse deep punctures. 



Body very robust, the subrecumbent setfe coarse, abuiwlant, pure white and 

 very conspicuous ; pronotum sparsely, unevenly and not coarsely punc- 

 tate 6 egregius 



Body narrow, the subrecumbent shorter hairs sparse, somewhat dark in 

 color and not very conspicuous ; pronotum coarsely and very densely 



punctate 7 sci'Ol)icollis 



Annals N. Y. Acad. Sci., VI, Sept. 1892.— 29 



