OP PHILADELPHIA. 153 



each other than the length of their diameters ; impressed stria? 

 none; interstitial lines with a few [261 J remote, acute, minute 

 punctures; lateral margin irregularly punctured, rounded : thighs 

 robust, mutic. 



Length seven-tenths to four-fifths of an inch. 



This species occiirred near the Rocky Mountains. 



[Also an EleodcA. — Lec] 



6. B. AXTRICATA. — Black ; elytra irregularly punctured, and 

 destitute of impressed striae. 



Inhabits Arkansa. 



Body deep black, narrowed anteriorly, oblong-subovate, imma- 

 culate, punctured : head acutely punctured : labrum with rigid 

 hairs: thorax subquadrate,- punctures smaller than those of the 

 head and more distant ; lateral edge regularly arquated ; anterior 

 edge very slightly concave ; posterior edge nearly rectilinear, a 

 little arquated each side near the angles which are obtuse : seutel 

 convex, inipunctured : elytra destitute of strias, or distinctly 

 regular series of punctures ; scabrous with minute slightly ele- 

 vated points, each of which precedes a puncture; lateral margin 

 rounded. 



Length about half an inch. 



This species occurs in the country of the Arkansa and Platte, 

 near the mountains. Mr. Nuttall also obtained specimens on the 

 Upper Missouri. It is somewhat similar to the preceding species, 

 but is shorter, and the sculpture of the elytra sufficiently distin- 

 guish it. 



[Also an Eleodes. — Lec] 



7. B. OBSOLETA. — Black; elytra striate, slightly scabrous; 

 suture obsoletely reddish-brown. [ 262 ] 



Inhabits Arkansa and Missouri. 



Body oblong-subovate, deep black, punctured : head and thorax 

 similar to those of the preceding species : elytra with impressed 

 striae, which are slightly scabrous, with minute elevated points 

 and impressed punctures ; interstitial lines also punctured ; sutural 

 margin obsoletely reddish-brown. 



Length from half an inch to more than three-fifths. 



Like the preceding, this species inhabits the arid plains in the 

 vicinity of the Rocky Mountains. The striae of this insect are 

 1824.] 



