222 ENTOMOLOGICAL NEWS. [May, 'lO 



Trib. Zonitini 

 Group Derideides. 

 Deridea, Isehna. 



Group Zonitides. 



Stenodera, Palaestra, (Tmesidera), Cochliophorns, Zonitis, (Euzoni- 

 tis), Zo nit aides. 



Group Nemognathides. 

 Gnathiuni, Xcinognatha, Leptopalpus. 



Trib. Horiini 

 Group Tricraniides. 



Trier a n iodes. Trier a n ia . 



Group Horiidcs. 

 Cissitcs, (Synlwria), Horia. 



The Genus Copestylum, 



BY J. M. ALDRICH, Moscow, Idaho. 



The genus under consideration belongs to the dipterous fam- 

 ily Syrphidae, and is closely related to Volucella, an immense 

 assemblage of mostly rather large flies having a Southern 

 range. The only generic character which sets off Copestylum 

 is the structure of the arista, which is covered, especially above 

 and toward the apex below, with closely set, short, black, flat- 

 tened hairs, giving it under the microscope a little the appear- 

 ance of a black ostrich plume. In Volucella the arista is of 

 ordinary structure, more or less plumose with the usual long, 

 thin, tapering hairs. 



The first member of this genus to become known to science 

 was marginatum, described as a I 7 olucclla by Say (a). His 

 material was from Mexico, and from the wording must have 

 consisted of a single specimen of each sex. 



Macquart (b) described the genus and founded it upon the 

 species flaviventris , from Colombia. He mentions two females. 



Osten Sacken (c) recognized Say's species (as a Volucella} 

 from Waco, Texas, in a single specimen; in (d) he correctly 

 place Jiiargiiiatitm under the genus Copestylum, and suggests 

 that ftaviventris may be a synonym. 



Williston (e) puts Macquart's species as a synonym of mar- 



