AMERICAN PHILOSOPHICAL SOCIETY. 629 



striate; basal fourth rufous; feet rufous: pectus distinctly 

 canaliculate each side of the middle. 



Length three-twentieths of an inch. 



Note. — I am indebted to Count Mannerheim of St. Peters- 

 burg, Russia, for this excellent observations on this genus. His 

 descriptions are detailed and perspicuous. I have adopted, for 

 the present, his views of this genus. 



[Also a Microrhagus. — Leg.] 



THROSCUS Latr. 



T. CONSTRICTOR. 



This species is the approximate analogue of the adstrictor 

 Fabr., of Europe, to which I had always referred it : but on 

 comparing our insect with a specimen of the adsfrictor, for which 

 I am indebted to the politeness of Professor Germar, I am in- 

 clined to consider it a distinct species, and I give to it the above 

 name, which that distinguished entomologist proposes in his 

 letter. This insect, compared with the adsfrictor, is of a paler 

 color, and a little different in form ; being less attenuated be- 

 hind; in size it is much the same; it is also somewhat more ob- 

 viously punctured. 



1836.] 



