406 NEW YORK STATE MUSEUM 



bbb Abdomen deep reddish, length i mm ; 5th antennal segment having 



the stems 2^ and 4 times the length of their diameters 



h u d s o n i c a n. sp., C. 200 



bbbb Abdomen dark reddish brown, length i mm ; 5th antennal segment 



having the stems 2J/2 and S/^ times the length of their diameters. . 



m o n t a n a n. sp., C. 325, 585 



METADIPLOSIS U. g. 



This genus is easily distinguished from the ordinary type of 

 Cecidomyia by the unique genitalia, the basal clasp segment being 

 short, stout, broadly rounded and with conspicuous triangular, chiti- 

 nous processes at the internal angles, while the terminal clasp seg- 

 ment is short, greatly constricted near the middle, enormously swol- 

 len and recurved apically. 



Type and sole species Metadiplosis spinosa n. sp. 



Metadiplosis spinosa n. sp. 



Male. Length i mm. Antennae dark brown, the basal segments 

 yellowish. Mesonotum dark brown, the submedian lines indistinct. 

 Scutellum reddish yellow, postscutellum reddish brown. Abdomen 

 light reddish brown, rather thickly clothed with pale setae and 

 slightly fuscous distally. Wings hyaline, halteres yellowish basally, 

 semitransparent apically. Legs a nearly uniform dark brown. 



Taken at Albany, N. Y., July 14, 1906, on quack grass. 



Type C. 573, N. Y. State Museum. 



EPIDIPLOSIS n. g. 



This genus is erected for a species remarkable because of the 

 enormously produced, curved, setose-bearing spine on the basal 

 clasp segment, this peculiar organ being nearly as long as the termi- 

 nal clasp segment and strongly suggesting the genitalic modification 

 we find in Lobodiplosis. It is, however, readily separable from this 

 last named genus by the simple claws. 



Type and sole species E p i d i p 1 o s i s s a y i n. sp., C. 429. 



Epidiplosis sayi n. sp. 



Male. Length 6 mm. Antennae light brown, yellowish basally; 

 face fuscous yellowish. Mesonotum fuscous brown, the submedian 

 lines narrow. Scutellum reddish brown, postscutellum yellowish, 

 the basal and terminal abdominal segments yellowish orange, the 



