160 AMERICAN COLEOPTERA. 



BRUCHID^. 

 BKUCHUS Linn. 



Within the last few years no less than twenty species have 

 been added to our fauna in this genus. Among these are a 

 few previously known Mexican species which have turned 

 up on our side of the border, but the greater number have 

 been recently described by Mr. Schaeffer from collections 

 made at Brownsville, Texas, and in Southern Arizona. That 

 our resources are not yet exhausted is evident from the fact 

 that after carefully checking off the recently added forms, 

 there still remain in my collection some seventeen unde- 

 scribed species, the most of which will be made known in 

 the following pages. Many of Mr. Schaeffer's species are 

 fine strongly characterized forms which may be easily identi- 

 fied from the descriptions ; on the other hand the greater 

 number here described are relatively small and obscure, 

 which taken together with the fact that nearly forty species 

 have now been added since our latest synopsis, has prompted 

 me to prepare new tables and add some notes and corrections. 



In this brief survey I have followed the Horn system of 

 division into groups while recognizing the fact that this in 

 some cases does violence to a natural arrangement of the 

 species. 



Group VI, which was based on depauperate individuals of 

 Group VII, I have combined with the latter, and I have inter- 

 polated Villa to contain a few species having four denticles 

 in addition to the longer femoral tooth. In a more scientific 

 division of the species it is probable that all of Horn's groups 

 after the fifth should be united, the number of denticles serv- 

 ing merely as a clue to identification within the group. 



To facilitate the use of the following tables I give below, 

 with the slight modification above mentioned, Horn's system 

 of grouping. 



Thorax with tooth at middle of side. 



Hind femur with tooth on outer side only Group I. 



Thorax not toothed at sides. 



Disc of thorax elevated with median groove Group II. 



Disc of thorax simply convex. 



