400 NEW YORK STATE MUSEUAE 



MYcoDiPLosis Rnbs. 

 This genus comprises a large number of small, yellowish or light 

 brown forms presenting very much the same general appearance 

 and yet differing considerably in structural characters. The anterior 

 claws are unidentate and the third vein as a rule joins the margin 

 of the wing beyond the apex. We have referred to this group a 

 considerable number of forms having a more or less uniform 

 structure and not referable to such recently erected genera as Kar- 

 shomyia, Lobodiplosis, Youngomyia and Coquillettomyia, all of 

 which are separated from this large genus by well marked structural 

 characters. 



Key to species 

 a Third vein uniting with costa well before the apex 

 b Harpes indistinct, not lobelike 



c Abdomen pale yellowish; ventral plate rather long, broadly emargi- 

 nate, the basal portion of the stem of the Sth antennal segment 

 with a length yi greater than its diameter, .reducta n. sp., C. 479 

 bb Harpes lobulate, distinct 

 c Harpes setose 



d Abdomen reddish brown ; ventral plate short, truncate, the basal 

 portion of the stem of the 5th antennal segment with a length 



twice its diameter m i n u t a Felt, C. 290 



cc Harpes strongly spined, the basal portion of the stem of the 5th 

 antennal segment with a length ^ greater than its diameter 



J Abdomen yellowish transparent; scutellum reddish brown 



a c e r i f o 1 i a Felt, C. 37 

 dd Abdomen dark reddish brown ; scutellum a pale fuscous yellowish 



p i n i Felt, C. 348 

 aa Third vein uniting with costa beyond the apex 



b Ventral plate long, at least Yi the length of the style 



c Ventral plate expanded apically, broadly and deeply cmarginate 

 d Dorsal plate long 



e Lobes greatly expanded distalh', spatulate ; abdomen yellowish, 



length .75 mm. . . . (C e c i d o m y i a) a n g u 1 a t a Felt, C. 332a 



(Syn. C . u r t i c a e Felt 123) 



ee Lobes long, not greatly expanded laterally, narrowly rounded 



apically 



/ Abdomen yellowish brown, reddish brown basally, length .75 



nun, the fifth antennal segment having the stems 2 and 2J/2 



times their diameters ; bred from folded, thickened cherry 



leaves. . . . (C e c i d o my i a) cerasifolia Felt, C. aiS7i 



// Abdomen light yellowish, reddish basally, length i mm; 5th 



antennal segment having the stems 2]^2 and 4 times their 



diameters; lired from gloliular leaf gall on poplar 



p o p u 1 i f o 1 i a n. sp., C. ai5T4 



