150 , ACADEMY OP NATURAL SCIENCES 



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

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

 may add that the four terminal joints are somewhat more dilated 

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

 emarginate at tip, is proportionally smaller than that of Scaitrus 

 stn'afus, permitting a view of the mandibles to the base; the palpi 

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

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

 seems to bear some resemblance to Enryclwra, but the antennae 

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

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

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

 be named Emlaj)hwn. It is still more closely allied to Helens 

 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 maxillas being armed with a horny 

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

 Heleus is a member. 



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

 allied to Ekodes than to Akis. — Leg.] 



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 : antennre, 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 inoqual surface, destitute 

 of distinct stria2 or punctures; lateral edge acute, a little reflected 

 at base ; hunicral angles acute. 



Length three-fourths of an inch. 



Found near the Rocky jMduntaiiis. The joints of the antennse 

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

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



[Vol. III. 



