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NEW YORK STATE MUSEUM 



been that some writers have employed the designation of Cecid- 

 omyia to represent a certain group of insects, while others have 

 used it in a totally different sense. The type of the genus D. 

 s i s y m b r i i Schrnk. is a well-known species, and a study of its 

 structures should forever obviate any further danger of confusion 



Fig. 18 Dasyneura gibsoni, showing the general 

 characteristics of the genus (much enlarged, original) 



with the more typical Cecidomyia. The generic term Perrisia, pro- 

 posed by Rondani in 1846 for D. u r t i c a e Perris, agrees so 

 closely with D. s i s y m b r i i Schrnk. that we are unwilling to 

 accord it generic rank, despite the fact that there are certain well- 

 marked antennal differences between the two. 



