THE CANADIAN ENTOMOLOGIST. 417 



TWO NEW CANADIAN GALL MIDGES. 



BY C. P. FliLT, ALBANY, N.Y. 



Cystiphora canadensis n. s;)., 



The interesting midge described below was reared July 10, 

 1913, by Dr. A. Cosens, Toronto, Canada, from an inconspicuous 

 flat, blister gall on the Icaxes of white lettuce or rattlesnake root, 

 Prenanthes altissima or P. alba. This is the second American 

 species of Cystiphora to be disco\ered and is easily distinguished 

 from C. vihurnifolia Felt by colorational and structural characters. 



Gall. — Circular, diameter 5 mm., dark purplish with a paler 

 center. There is no perceptible thickening of the tissues. The 

 galls are placed irregularly between the veins. 



Female. — Length 1.25 mm. Antenuic extending to the third 

 abdominal segment, sparsely haired, dark brown; 13 or 14 segments, 

 the fifth cylindric, with a length twice its diameter; terminal seg- 

 ment either simple or composed of two closely fused segments. 

 Palpi: first segment irregularly capitate, the second subquadrate, 

 the third slender, with a length fully five times its diameter. Meso- 

 notum shining dark brown. Scutellum, postscutellum and abdo- 

 men mostly reddish brown, the terminal abdominal segment 

 fuscous, the tip of the ovipositor yellowish. Wings hyaline, the 

 third vein uniting with the anterior margin at the distal ninth. 

 Halteres pale yellowish. Coxa? and femora basally, fuscous yel- 

 lowish, the distal portion of femora, tibicie and tarsi mostly fuscous; 

 claws slender, toothed, the pulvilli as long as the claws. Ovi- 

 positor with a length nearly half that of the abdomen, the basal 

 half distinctly swollen and rather heavily chitinized, the distal half 

 with a diameter about half that of the basal portion, tapering 

 slightly to a narrowly rounded apex bearing a slender spur. Type 

 Cecid a2441. 



Hormomyia helianthi Brodie 



1894, Brodie, William— Biol. Rev. of-Ont., I, pp. 44-46 (Cecido- 

 myia) . 



1909, Jarvis, T. D.— Ent. Soc, Ont., 39th Rep't., p. 83 (Ceci- 

 domyia). 



The axillary galls of this species occur on Helianthus. They 

 are more or less cyliridric, occasionally flask-shaped and, according 



Decembar, 1913 



