102 THE CANADIAN ENTOMOLOGIST. 



scales, and this latter is much larger than in C. interruptus. The hind 

 wings are darker in C. concheiliis, and the thorax and head not so purely 

 white. 



C. interruptus has also been taken at Grimsby, Ont., by my kind 

 friend, Mr. J. Pettit. I have seen no specimens from New York State 

 yet, but it will probably occur with us. Its average expanse is 21 mil. 

 For a fine series of C. coiichellus I am indebted to Prof Zeller, of Stettin. 



A NEW GENUS OF APHID^. 



BY J. MONELL, MISSOURI BOTANIC GARDENS, ST. LOUIS, MO. 



Co/opha, 710V. gen. 



Antennae six jointed, wrinkled transversely, and almost moniliform. 

 Front wings with three discoidals ; the cubital once-branched. 

 Hind wings with one oblique vein. 

 Wings in repose, usually horizontal. 



C. ulmicola (Fitch) — Byrsocrypta ulmicola Fitch, N. Y. Rep., ii., 347. 

 Thelaxes ubnicola (Walsh), Proc. Phil. Ent. Soc, i., "American Ento- 

 mologist," vol. i., 108. 



The above-mentioned species was originally described by Dr. Fitch 

 (N. Y. Rep., 347), who had not seen the winged form, as Byrsocripta 

 ulmicola. The winged individuals were first described by the late Prof 

 Walsh, who removed it to " Thelaxes Westw." Judging alone from the 

 original description of Thelaxes in the " Synopsis of British Genera of 

 Insects," it would be almost impossible to say whether this insect is a 

 Thelaxes or not ; but Prof Westwood states in his " Arcana Ento- 

 mologica" (ii.,p. 64) that his genus Thelaxes is synonymous with Vacuna 

 Kalt; and since, in addition to other differences, Vacuna has five-jointed 

 antennae, it is evident that our insect can not belong to that genus, and as 

 I can find no generic description which will at all agree with this, either 

 in our American authorities or in Koch, Kaltenback and Passerini, T have 

 presumed it to be new and described it accordingly. 



