NO. 1988. STUDIES OF NORTH AMERICAN WEEVILS— PIERCE. 381 

 AMOTUS LONGISTERNUS Casey. 



The nasal plate is triangular with truncate lateral angles and basal 

 emargination. The area is bounded by a poorly defined rim, is 

 glabrous and strongly punctate. 



AMOTUS GRACILIOR Casey. 



Mimetes setulosus Horn, 1876 [not Lacordairej. 



The nasal plate is represented by a broadly triangular, punctate, 

 glabrous ill-defined, basally emarginate area. 



AMOTUS LONGIPENNIS Pierce. 



The nasal plate is represented by an apically convex, basally 

 emarginate, punctate, glabrous depressed area. 



Genus DIAMIMUS Horn (1876). 

 Diamimus Horn, Proc. Amer. Philos. Soc, vol. 15, 1876, p. 46. 

 The genus is monotypic, based on suhsericeus Horn. 



DIAMIMUS SUBSERICEUS Horn. 



The nasal plate is a well-defined concave, rimmed, glabrous, 



minutely punctate, basaUy emarginate, ogival area. The posterior 



tibiae have at the apex a double row of bristles forming an inclosed 



area. 



Genus PERITAXIA Horn (1876). 



Peritaxta B-ORN , Proc. Amer. Philos. Soc., vol. 15, 1876, p. 46. 



In the absence of previous type designation we may consider rugi- 

 collis Horn as type. 



The species of this genus have a habitus very easy to recognize. 



The vestiture is varnished and interspersed with much pubescence. 



The nasal plate is concave, triangular, rimmed, glabrous and basally 



emarginate. The tip of the posterior tibiae has only a single row of 



bristles. 



Table of species of Peritaoda. 



1. Elytral interspaces much wider than striae. Species moderately robust. 



a^. Pubescence short, cinereous, vestiture consisting of very dark piceous scales; 



ocular lobes distinct but feeble rugicoUis Horn. 



a?. Pubescence long, grayish. 



6^ Prothorax as broad as long, very irregularly, but deeply punctate; size 



9 mm hispida Horn. 



b~. Prothorax transverse, indistinctly punctate; size 5-7. 5.. perforata Casey. 



2. Elytral interspaces not wider than strial punctures. Prothorax as long as broad, 



deeply and regularly punctate. Species very slender. Pubescence long gray- 

 ish; size 8 mm elongata, new species. 



PERITAXIA ELONGATA, new species. 



Described from a single specimen collected in the Chisos Mountains, 

 Brewster County, Tex., June 10, 12, 1908 (Mitchell and Cushman.) 



A very slender, elongate species, bristlirig with long pubescence 

 and clad with a thick varnished covering of scales. Body black, 



