190 DESCRIPTIONS OF AND OBSERVATIONS ON 



subequal, to the last, which is a little longer ; thorax convex, but not 

 much elevated: elytra striate; basal fourth rufous: feet rufous : pectus 

 distinctly canaliculate each side of the middle. — Length three-twen' 

 tieths of an inch. 



Note. — I am indebted to Count Mannerheim of St Petersburg, Rus- 

 sia, for his excellent observations on this genus. His descriptions are 

 detailed and perspicuous. I have adopted, for the present, his views 

 of this genus. 



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 in- 

 sect with a specimen of the adstrictor, for which I am indebted to the 

 politeness of Professor Germar, I am inclined to consider it a distinct 

 species, and I give to it the above name, which that distinguished ento- 

 mologist proposes in his letter. This insect, compared with the ad- 

 strictor, is of a paler colour, and a little dififerent in form ; being less 

 attenuated behind ; in size it is much the same ; it is also somewhat 

 more obviously punctured. 



