INSECT-GALLS OF THE VICINITY OF NEW YORK CITY 



culent. Yellowish green, tinged with red or entirely of this eolor. 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. ]\Iost 

 of them feed on fungi and in damp places where there is deca^dng 

 vegetable matter. 



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

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

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



Family Trypetid^e, 



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 {Trypeta polita Loew) — Consists of a small bunch of 



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