245 



Acordulecera dorsalis, Say. — This species is not vincomraon upon 

 the bitter hickory {Carya amara) in June and Aiigust. My specimens 

 are all females of var. h. of Norton. Abbe Provancher has described, 

 from a single si)eciraen, A. saginata, which seems to me to be identical 

 with this variety of cIoJsaHs. 



Hylotoma. — We have three species, all of which appear to be rare. 



Cladius isomeria, Harris. The larvtB of this species ai-e yellowish, 

 black-spotted grubs, occurring )dentifully on vvillows in June. They 

 spin a light, transparent yellowish cocoon, and the flies emerge toward 

 the end of July. Specimens bred by me last year were all females, 

 and I am indebted to Mr. Fletcher for the male. 



Nematus. — Of this destructive genus we have several species, 

 including the universally known venlricosus, or currant saw-fly. 

 Another species which has attracted much attention recently by its 

 ravages on the larches in Quebec, New Brunswick and portions of the 

 United States, has apparently reached this locality, and will be found 

 here next summer, viz., iV. Erichsonii. 



Messct hyalina, Nort. — Mr. Guignard has captured a number of 

 this species, which has not hitherto been recorded from Canada. He 

 informs me that they were obtained in his yard in July, and had jn-ob- 

 ably been carried thither by easterly winds from some large poplar 

 trees on Waller street. 



Eniphytus. — Four or five species of this genus occur, including E. 

 maculatus, a well-known foe to strawberry plants. 



Dohriis. — Of our six species of this genus, aprilis is the most com- 

 mon, and is the only one which has yielded both sexes ; unlcolor and 

 arvensis are probably sexual varieties of one species, as specimens of 

 the former aie all males and of the latter all females. My specimens 

 of arvensis were obtained early in May upon stumps covered with fer- 

 menting sap, which attracts many insects. 



Dinuera Americana, Frov. — I have captured one specimen of this 

 rare species, which has the venation of the wings very irregular, the 

 cross nervure between the marginal cells being almost obsolete, and 

 there being only three sub-marginals instead of four. 



Selandria. — This genus contains several vei-y injurious species, of 

 which ruhi, the raspberry .saw-fly, is perhajos the most obnoxious. Its 



