92 ACADEMY OF NATURAL SCIENCES 



Body pale testaceous, with numerous minute hairs, which on 

 the elytra are yellowish : head with a slight irregular frontal im- 

 pressed line each side : antennae brown at tip : thorax with a 

 longitudinal impressed line from the head to the scutel : elytra 

 black-blue, [ 144 ] with very obtuse hardly impressed grooves : 

 venter testaceous or blackish-piceous. 



This species was found by Mr. Nuttall in Missouri, and T have 

 since observed great numbers of them near Engineer Canton- 

 ment. These chiefly occurred during the winter, in a quarry 

 from which building stone had been taken for the use of Camp 

 Missouri. They were found hybernating in the fissures of the 

 rocks. 



It differs from the B. fnmavs in being much inferior in point 

 of size, in this respect approaching nearer to B. crepitans of 

 Europe. The greatest width of the thorax is much more con- 

 siderable in proportion to the shortest diameter, than that of the 

 fumans, and of course the thorax appears proportionally wider 

 before. The color, also, of the head and thorax is different, and 

 the elytra are far more slightly grooved. It possesses the singu- 

 lar power of crepitating common to its congeners. 



FEEONIA Latr. 



1. F. SUPERCILIOSA. — Apterous; black, impunctured ; elytra 

 tinged Avith purplish ; basal thoracic lines dilated. 



Length nearly two-thirds of an inch. 



Body black, impunctured, glabrous : antennae surpassing the 

 base of the thorax, with brownish hair towards the tip ; frontal 

 groove much dilated : labrum and palpi piceous, the former 

 emarginate ; thorax wide before, much marrowed behind ; dorsal 

 [ 145 ] line distinct, basal lines dilated ; a very distinct anterior 

 transverse line ; lateral edge rectilinear from near the middle to 

 the posterior angles j posterior angles rounded ; base wider than 

 the petiole : elytra tinged with purple ; striae profound, impunc- 

 tured ; interstitial lines convex : beneath tinged with piceous. 



This species, which seems to belong to the genus Pteiostichus 

 of Bonelli, is closely allied to that which I have described under 

 the name of Hfi/gicun, but the thorax is differently formed, being 

 much wider before, the antennae longer, frontal grooves more 

 dilated, the elytra of a different color and more obtuse. 



[Vol. III. 



