394 NEW YORK STATE MUSEUM 



cc Abdomen dark brown or brownish black 



d The 5th antennal segment with the basal portion of the stem 

 having a length equal to its diameter, the distal portion of 

 the stem with a length 3 times its diameter; the 4th palpal 

 segment ]/2 longer than the 3d. Bred from Negundo. . . . . . 



^ n e g u n d i f 1 i a n. sp., C. 967 



dd The 5th antennal segment with the 2 portions of the stem 



having a length ^ greater than the diameter ; the 4th palpal 



segment ^ longer than the 3d. Bred from melon tip 



s e t i g e r a Lintn. 



ddd The 5th antennal segment with the 2 parts of the stem 



.having a length 2^ times greater than the diameter; the 



4th palpal segment twice the length of the preceding. 



Probably bred from Fraxinus 



canadensis n. sp., C. 1027 



DICHRODIPLOSIS Kieff. 



A few soiTiewhat diverse species have been referred to this genus 

 because they have all the claws unidentate. It is probable that 

 several forms at least are not cogeneric with the type of the above 

 named genus. 



Key to species 



a Abdomen fuscous yellowish, length 1.25 mm; fifth antennal segment having 

 the stems with a length 3^ and 4^ times their diameters ; palpi quadri- 



articulate ; bred from a subglobular leaf gall on poplar 



p o p u 1 i n. sp., C. ai743 

 aa Abdomen reddish brown 



h Fifth antennal segment having the stems with a length 2 and 3^/^ 



times their diameters; length 1.5 mm. . . .a n d r o g y n e s n. sp., C. 6 



hb Fifth antennal segment having the stems very short, the basal stem with 



a length only about 5^ its diameter 



c Antennal swellings elongate, coalescing; length 1.5 mm; probably bred 



from oak leaves (Cecidomyia) quercina Felt, C. 1006 



cc Antennal swellings stout, well separated, length 1.5 mm 



(Cecidomyia) multifila Felt, C. 1024 



BREMiA Rond. 

 This genus, like Aphidoletes, has the antennal setae and hairs 

 greatly prolonged on the dorsal face. The male may be distin- 

 guished from all other Cecidomyiidae known to us by the low 

 rtidimentary circumfilum occurring on the base of the distal en- 

 largement of the antennal segments [fig. 44]. The pulvilli are 

 very short or rudimentary, the anterior claws only being uniden- 



1 Possibly the same as Cec i d o m yia negundinis Gill, 



