150 ACADEMY OF NATURAL SCIENCES 



Occurred under dried bison dung, &c., near the Rocky Moun- 

 tains. In addition to the above description of the antennse, I 

 may add that the four terminal joints are somewhat more dilated 

 than the others. The mentum, although broader than long and 

 emarginate at tip, is proportionally smaller than that of Scaiirus 

 striatum, permitting a view of the mandibles to the base; the palpi 

 are decidedly more dilated at tip than those of Tentyria glabra ; 

 in this respect approaching the family of Blapsidse. In form it 

 seems to bear some resemblance to Eurydwra, but the antennae 

 are eleven-jointed. As it does not entirely agree with any genus 

 the characters of which Latreille has noted, it may be proper to 

 remove it to the Blapsidae, under a separate genus, which may 

 be named Emhajihion. It is still more closely allied to Helcus 

 by its form, and indeed, if external characters only were to be 

 considered, we would certainly be justified in referring it to that 

 genus, but the fact of the maxilla; being armed with a horny 

 nail, excludes it entirely and absolutely from the family of which 

 Helens is a member. 



[The genus Umhaphion is well grounded, and is more nearly 

 allied to Eleodes than to Akis. — Lec] 



ASIDA Latr. 



1. A. OPACA. — Black, opaque, scabrous: thorax with acute 

 angles, and lateral reflected margin; elytra subinequal. [255] 



Inhabits Arkansa. 



Body black, opaque, scabrous with minute elevated points, 

 which furnish very minute polished hairs : antennae, terminal 

 joint as small as the second : thorax widely emarginate for the 

 reception of the head ; anterior angles prominent ; lateral margin 

 dilated, reflected ; lateral edge arquated, excurved near the base : 

 posterior angle very prominent, acute ; posterior edge slightly de- 

 flected in the middle, recurved each side towards the angles : 

 scutel minute : elytra with a somewhat inequal surface, destitute 

 of distinct strias or punctures ; lateral edge acute, a little reflected 

 at base ; humeral angles acute. 



Length three-fourths of an inch. 



Found near the Rocky Mountains. The joints of the antennje 

 gradually become a little wider and shorter to the terminal one, 

 Avhich is less than half the size of the preceding joint. The 



[Vol. III. 



