308 AMERICAN PACHYBRACHYS (cOLEOPTERa) 



end of the detailed description. Unless otherwise stated, all types 

 are in the author's collection. 



Table of Groups 

 Front thighs not at all stouter; tibiae completely unarmed; eyes 



very small and remote Group F 



Front thighs always thickened; middle tibiae always, and front 

 tibiae except very rarely, with terminal spur; eyes large and 

 less remote. 



Upper surface distinctly pubescent Group A 



Upper surface glabrous or virtually so. 



Species wholly or in great part yellow or testaceous, the 

 legs never entirely black; thoracic M not sharply defined 

 (except palUdipennis) though often faintly or vaguely 

 indicated by diffuse brownish clouds; punctures usually 

 of some shade of brown; elytra with rare exceptions with- 

 out dorsal cloud or traces of standard spots. . . .Group B 

 Species yellow or testaceous with black or brown markings 

 representing the standard spots, the markings varying 

 greatly in development, both by reduction and extension, 

 and often irregularly confluent or confusedly mottled. 



Group C 



Species having the elytra more or less distinctly vittate. 



Group D 



Species wholly or in great part black, the pale areas gener- 

 ally few and small, but in a few species more extensive 

 and definitely arranged Group E 



Table of Species 



Group A 

 Pubescent species 

 The group character possessed by all the species here included, 

 is so definite as to need no elucidation. In only one species 

 (fortis) of the following groups have I observed any appreciable 

 pubescence on the upper surface, and there it is so sparse and 

 inconspicuous as to easily escape notice. 



1. Hind tibiae without terminal spin- 2 



Hind tibiae with slender terminal .spur. 



Elytral punctuation completely confused, ej^es widely distant. 



