AMERICAN DIPTERA. 53 



Cecidomyia caryae nucicola, n. sp. 



Green husk of tlie nuts of the shell-bark hickory (^Carya aILn), de- 

 formed by swellings, giving it an irregular appearance. When cut 

 open the bumps showed small round cavities on the inside, often two 

 or three together, each containing a pale reddish larva. Its breast- 

 bone is distinct, elongated, narrow, its branches short and square, end- 

 ing in sharp angles anteriorl}', instead of being rounded ; the emargi- 

 nation between them broad and deep. Anal end of the body smooth. 

 In one case, the husk of a small nut, thus deformed, had burst open, 

 leaving the nut uncovered, although it was yet far from being ripe ; 

 what remained of the husk formed several wart-like swellings on the 

 basal portion of the nut. 



Found August 0, 18G0, near Rhiuebeck, X. Y. 



Cecidomyia tilise citriaa, n. sp. 



Swollen and deformed terminal buds on young shoots of the linden 

 tree (7'i/ia a mrricaiia~). The gall thus formed is irregular in shape. 

 with leaves growing out of it; its flesh moderately succulent. The 

 cavities inside are filled with bright lemon-yellow larvae of Cecidomi/in. 

 Breast-bone small, but distinct; the excision on its anterior edge is 

 unusually deep. 



On the leaves surrounding the larger galls, the same gall occurred 

 in the shape of a small round swelling of the midrib ; its identity with 

 the larger gall was proved by the presence of the yellow larviu inside 

 of it. 



Found in July, 18G9, near Sharon Springs, X. Y. 



Cecidomyia qaercas majulis, n. sp. 



]Jlister-like gall of Cecidomyia on young leaves of the pin-oak 

 ( Qucrcus palustriii). 



Generall)', these galls occur on the principal ribs of the leaf; sonje- 

 times between the ribs. They are oblong, blister-like, hollow ; surface 

 somewhat uneven, wrinkled, walls thin ; color pale green or reddish. 

 They bulge out on one side of the leaf and have a longitudinal slit on 

 the other. Galls projecting on the under side of the leaf and having 

 the slit on the upper side seem to be somewhat more common than 

 those of the opposite description. The slit can be opened without in- 

 juring the gall by gently pulling at the sides. Such galls which grow 

 upon a rib show a trace of it on their longitudinal diameter. The 

 larva, which can be taken out of the slit without lacerating the gall, is 

 rather larger than the majority of the larvae of Cecidomyia, (about 0.2 

 of an inch long.) and not reddish, as usual, but white, smooth ; the 



