304 ACADEMY OF NATURAL SCIENCES 



rather narrower than the elytra, and with the head densely and 

 minutely punctured : elytra with impressed, punctured striae, and 

 convex interstitial lines : thighs bright rufous ; tibiae, anterior 

 [204] pair of the male with a short spine on the inner middle. 



Length half an inch. 



I have stated this insect to be polished, in order to distinguish 

 it from the Upis fulvipes Herbst, which it very much resembles, 

 and with which it is strictly congeneric. 



[[Also a Centronqnis. — Lec] 



[Continuation from Vol. 5, Nov., 1826, pp. 237—284.] 



OPATRUM Fabr. 



1. 0. NOTUM. — Brownish-black : elytra with regular series of 

 impressed punctures. 



Opatrum clathratum Melsh. Catal. 



Head with small, close set punctures ; terminal emargiuation 

 not angulated : thorax with small, close set punctures ; lateral 

 edge reflected ; posterior angles somewhat produced subacute : 

 elytra destitute of impressed strias, but with regular series of 

 large, profoundly impressed, rather longitudinal punctures ; tarsi 

 piceous. 



Length less than seven-twentieths of an inch. 



This does not correspond with the description of the clathra- 

 tum Fabr., inasmuch as the elytra are not striated. It is common. 



[Belongs to Ojmtrinus. — Lec] 



2. 0. PULLUM. — Brown j head and thorax dai'ker ; elytra 

 with punctured striae ; beneath reddish -brown. 



Desc. Head and thorax dark-brown, minutely and densely 

 punctured ; posterior angles not prominent ; lateral edges not re- 

 flected : antennae piceous ; terminal emarginations of the clypeus 

 not angulated : elytra with impressed, punctured striae, the punc- 

 tures profound, somewhat transverse ; interstitial lines with 

 numerous small punctures : beneath reddish-brown. 



Length rather more than three-tenths of an inch. [238] 



I obtained this species on the margin of the Arkansas river, 



[Vol. V. 



