50 COLEOPTERA. 



herd, and communicated to Dr. Kraatz, who returned it as 

 certainly distinct from any known species. 



It appears to be allied to S. melanariuSf Steph. {cine- 

 rascensy E'*.), but to be larger and more shining than that 

 species, and having the palpi black, except the basal joint, 

 which is yellow. From S. huphthalm.iis it seems to be at 

 once known by its sparingly punctured abdomen. The 

 middle keels of its abdominal segments appear to be strongly 

 elevated. 



8. Stenus annulatus. Crotch, Cat. Brit. Col. ed. 2; id. 

 Proc. Ent. Soc. 19 Nov. 1866 (described); Ent. 

 Mo. Mag. vol. iii, p. 168. 



Dr. Kraatz appears to have returned, as new, the insect 

 pointed out in my descriptions of our Stent (Ent. Mo. 

 Mag. vol. i, p. 92) as probably undescribed, and distinct 

 from S. impressus, from which it varies in its longei* elytra 

 and the greater amount of dark coloration at the apex of the 

 posterior femora. Mr. Crotch even suggests that it may be 

 a winged form of that insect, and states that it must be 

 close to S.flacipalpis, Thomson, though from his notes on 

 inspecting that author's types three years ago, it would seem 

 that the latter must be near St. impressipe7inis iosshim). 



From Thomson's description it seems to me impossible that 

 Insjlavipalpis can be reconciled with either the latter species 

 or S. annulatus. 



In De Marseul's Cat. (ed. 2), the very suggestive name 

 of S. annvUpes (erroneously attributed by him to Erichson, 

 instead of Heer) is given as a synonym of S. impressus. It 

 seems, however, to have nothing to do with that species, and 

 to be very close to S. geniculatus. 



