APPENDIX. 283 



and rounded; tibia pale rufous; posterior thighs much di- 

 lated, formed for leaping. 



Lenscth three-twentieths of an inch. 



SERROPALPUS, Oliv. 



S. 4-maculatvs. Blackish-brown, sericeous; elytra with 

 two yellow spots. 



Inhabits Arkansa and Missouri. 



jintennas and lahrum dull testaceous; thorax, anterior 

 margin obsoletely dull testaceous; scutel minute; elytra 

 narrower behind; a large, very irregular yellow spot before 

 the middle and another behind the middle oi ed^ch-, pectus 

 and postpectus distinctly punctured; anterior tarsi dilat- 

 ed and covered beneath by very dense, short, yellow hair; 

 remaining tarsi slender; venter dark red-brown, paler at 

 tip. 



Length nearly seven-twentieths of an inch. 



This species appears to be of rare occurrence. 



HELOPS, Fahr. Latr. 



1. H. arctatus. Dark brassy, irregularly punctured; 

 elytra with dilated indentations. 



Inhabits North-west Territory. 



Body long, cylindrical, a little depressed; punctures di- 

 lated, rather large, profound, approximate, irregularly dis- 

 posed; antennse piceous, less than half the length of the 

 bod)'', terminal joint oh\ong-o\ 2\\ palpi dark piceous, long; 

 labrum, breadth equal to twice the length; a small impres- 

 sed spot between the eyes; ?Aoro.r depressed; widest hardly 

 before the middle, from which part the edge is rectilinear 

 to the posterior angles, and very nearly rectilinear tg the 



