

"■^ 



Cjje Canadian dMomotopi 



VOL. VII. LONDON, ONT., NOVEMBER, 1875. No. 11 



V 



THREE NEW GALLS OF CECIDOMYIA. 



BY C. R. OSTEN SACKEN, CAMBRIDGE, MASS. 



I hardly need an apology for presenting from time to time to the 

 entomological public descriptions of galls of Cecidomyice, even when I 

 did not succeed in rearing the fly. Such observations, unless published 

 soon, are very apt to be lost ; once published, they gradually accumulate 

 and furnish a welcome material for the future monographer. To facilitate 

 reference, I give here a list of my previous publications on the galls of 

 North American Cecidomyice : — 



1. On the N. Am. Cecidomyicz (In the Monogr. N. A. Diptera, vol. 



!>P- !73— 2 °5)« 



2. Lasioplera, reared from a gall on the Golden-rod (Proc. Ent. Soc. 



Phil. 1863, p. 368—370). 



3. Two new N. A. Cecidomyicz (Proc. Ent. Soc. Phil. 1866, p. 219 — 

 220). 



4. Biological notes on Diptera. Article first : Asphondylia monaclia, 

 n. sp., and other galls on Solidago (Trans. Ent. Soc. Phil. 1S69, p. 299 — 

 303). Article second : AnewAmer. Asphondylia; On some undescribed 

 galls of Cecidomyice. Article third : A Cecidomyia living in pine resin 

 (Diplosis resinicola, n. sp.) ; a gall of Cecidomyia on Wild Cherry; 

 additions, corrections. 



Cecidomyia (tilise) verrucicola, n. sp. Wart-shaped, round, pale green 

 galls, 3 — 4 millim. in diameter, projecting on the upper and underside of 

 the leaves of the linden. They occur between the ribs and veins and 

 often upon them. In autumn they become brown, hard and woody, and 

 spring open on the underside, a circular piece detaching itself and either 

 falling to the ground, or remaining fastened to the gall by a small portion 

 of its circumference, in the shape of a lid. Inside of the gall, when 

 green, there is a low-roofed cavity, containing a white larva, with a distinct 



