83 



The two sexes differed in color, and I saw them united repeat- 

 edly. Not one female had a tail, and this circumstance puzzled 

 me. I read Knoch's description of the canaliculatus^ the 

 female of which he says is furnished " aculeo ani elongato." 

 The presumption with me is that there are two species ; the 

 tailed one of the South being the true canaliculatus of Fabri- 







cius and Knocli, and the other the canaliculatus of Olivier, or 

 squamiger of Beauvois. 



You have not sent me any species of Slaps, but I have 

 B. tricostata Say, from Arkansas, and supposed that all the 

 American insects of the family were confined to the dry plains 

 of the West. You ask me what is the name of our common 

 large Tencbrio ? Not knowing exactly to what species you 

 refer, I subjoin the names of all my species, premising that I 

 make, with Herbst, a subgenus of those species which have the 

 thorax narrower at base than the coleoptra, and having the 

 antennas conspicuously thicker towards the tip. 



Subgenus Upis Herbst. 



No. 427, Tenebrio ( Upis) rugosus, mi. Black, rugose, opaque ; 

 each elytron with nine series of deep linear impressions ; 

 thorax broadest, before the middle, excurved before the poste- 

 rior angles which are produced ; two last ventral segments 

 subkevigated. Length .80 in. ; breadth .35 in. 



This insect appears to be rare. It was brought to me by my 

 cousin, who captured it in New Hampshire. It resembles 

 somewhat exeavatus Herbst, from India. 



No. 313, Icevis Oliv., pennsylvanicus Knoch and Do Geer ; 

 chrysops ? Herbst. Black, Isevigated ; each elytron with nine 

 series of small punctures, which are nearly obsolete at tip ; 

 thorax broadest behind the middle, posterior angles acute, 

 slightly excurved. Length from .75 in. to .84 in. ; breadth 

 from .27 in. to .32 in. 



No. 312, reticulatus Say. 



No. 708, rufipes Say. 



