188 long's second expedition. 



HELOPS Fabr. Latr. 



1. H. ARCTATUS. — Dark brassy, irregularly punctured; elytra 

 with dilated indentations. 



Inhabits Nortb-west Territory. 



Body long, cylindrical, a Jittle depressed; punctures dilated, 

 rather large, profound, approximate, irregularly disposed ; antennae 

 piceous, less than half the length of the body, terminal joint ob- 

 long-oval; palpi dark piceous, long labrum, breadth equal to 

 twice the length ; a small impressed spot between the eyes ; 

 thorax depressed ; widest hardly before the middle, from which 

 part the edge is rectilinear to the posterior angles, and very 

 nearly rectilinear to the [284] anterior angles, which are obtusely 

 rounded ; posterior angles a little angulated ; scutel rounded be- 

 hind, with short, cinereous, prostrate hairs ; elytra not dilated 

 behind; punctures larger than those of the thorax, often con- 

 fluent ; a slightly prominent line between the middle and su- 

 ture, a depressed one between the middle and lateral margin ; 

 several slightly elevated lines near the tip; disk with two 

 series of two or three much dilated alternate indented spaces ; tip 

 rounded ; beneath blackish with small punctures ; feet blackish- 

 piceous. 



Length half an inch. 



This insect occurred on the shore of St. Peter's river, and on 

 that of Red river of Lake Winnepeek. The larger indentations 

 of the elytra have a fortuitous appearance. 



[A Stenotrachelus identical with the Russian American S. oh- 

 scurus Mann. Bull. Mosc. 1852, 347. — Leg.] 



2. H. VENUSTUS. — Dark brassy, punctured; posterior angles 

 of the thorax slightly excurved ; elytra iridescent. 



Inhabits Pennsylvania. 



Body densely punctured ; antennae and palpi blackish-piceous ; 

 thorax, posterior angles acute, the lateral edge near them being 

 a little curved outwards ; elytra with brilliant coppery and green 

 vittae changing place with the direction of light ; striaj profound, 

 and with the convex interstitial spaces impunctured ; beneath 

 cupreous, brilliant. 



Length more than three-tenths of an inch. 



This species closely resembles the micans, Fabr. which has 



