INSECTS OF LOUISIANA. 301 



but the puncture upon the middle of each of the two posterior 

 ventral segments is very obvious, and does not exist in the pre- 

 sent insect. I have found it in Florida and Pennsylvania. Dr. 

 Pickering sent me an individual from Salem, Massachusetts. It 

 resembles marnioratus nob., which is a much larger insect and 

 has the two ventral punctures like murtnus but smaller. 



[The ventral punctures mentioned are not specific but sexual 

 eharacters. — Lec] 



ATEUCHUS Fabr. 



A. HUMECTUS. — Blue-black, glabrous, impunctured ; elytra 

 with minute striae. 



Inhabits Mexico. 



Body black with a decided tinge of blue or violaceous, impunc- 

 tured, glabrous, polished : head simple, bidentate at tip : antennae 

 cinereous-black, dull ferruginous at base : thorax simple, rather 

 convex : elytra somewhat convex, striae acute but remarkably 

 slender and slightly impressed, not visible to the unassisted 

 eye. [5] 



Length nine-twentieths of an inch. 



Much smaller than volvcns Fabr., which it resembles much in 

 the form of the head, but the present species is polished and 

 entirely impunctured. 



[Belongs to Cantlion. — Lec] 



TROX Fabr. 



T. /EQUALI8. — Elytra simply striate, the interstitial spaces con- 

 vex with ferruginous fascicles. 



Inhabits United States. 



Body brown-black, punctured : palpi and antennae rufous : 

 thorax not deeply impressed along the middle : elytra regularly 

 and simply striated : interstitial lines equal, a little convex, with 

 oblong fascicles of ferruginous hair ; feet black-piceous. 



Length one-fourth of an inch. 



This species inhabits various parts of the Union, and I re- 

 ceived a specimen several years since, from Dr. Melsheimer, un- 

 der the name I have adopted. It resembles arenarius F. of 

 which however the alternate interstitial lines are more elevated. 



