400 NEW YORK STATE MUSEUM 



MYCODIPLOSIS Rubs. 



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 5th antennal segment 

 with a length ^ greater than its diameter, .r e d u c t a 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 



c? Abdomen yellowish transparent; scutelkmi 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 ^ the length of the style 



c Ventral plate expanded apically, broadly and deeply emarginate 

 d Dorsal plate long 



e Lobes -greatly expanded distally, 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. urticae Felt 123) 



ee Lobes long, not greatly- expanded laterally, narrowly rounded 



apically 



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



mm, the fifth antennal segment having the stems 2 and 2^ 



times their diameters ; bred from folded, thickened cherry 



leaves. ... (C e c i d o m y i a) cerasifolia Felt, C. ai57i 



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



antennal segment having the stems 2>4 and 4 times their 



diameters; bred from glol)nlar leaf gall on poplar 



p o p u 1 i f o 1 i a n. sp., C. aT5i4 



