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632 NEW YORK STATE MUSEUM 



aciculate unicellular hairs." He has recorded the species from Wilmington 

 111. [tSVr pi. 1, fig. 14] 



Ash midrib gall 



Cecidomyia pcllex Osten Sacken. 



A peculiar, elongated, greenish or reddish brown gall wrapping itself about the 

 midrib and inclosing whitish, footless larvae, is the work of this species. 



Fig. 169 Ash midrib gall, Cecidomyia pellex (original) 



This insect is somewhat common in the Hudson river valley, having 

 been observed in the neighborhood of South Durham by Mr O. Q. Flint 

 and found in numbers at Poughkeepsie by Mr Young. It also occurs about 

 Albany, the galls being nearly full grown the latter part of May or early in 

 J nne. 



