INSECT-GALLS OF THE VICINITY OF NEW YORK CITY ^7, 



culent. Yellowish green, tinged with red or entirely of this color. On stems 

 and leaf stalks of wild grapes. May and June. Common. 



Family Mycetophilid^ (Fungus-gnats). 



The species of flies belonging to this family are of medium 

 or small size and are more or less mosquito-like in form. ^lost 

 of them feed on fungi and in damp places where there is decaying 

 vegetable matter. 



73. Maple Spot Gall {Sciara ocellata Osten Sacken). — Eye-like, circular, 

 fiat. Light yellow, with a red central dot, or entirely green or yellow. In 

 numbers on the leaves of red maple {Acer rubrum). Common. 



Family Trypetid.^. 



Only a certain number of species belonging to this family of 

 flies produce galls. The wings of many of the species are beauti- 

 fully marked with spots or bands. 



74. .Goldenrod Gall {Trypcta polita Loew). — Consists of a small bunch of 



