398 NEW YORK STATE MUSEUM 



codiplosids, breed largely in fungi. The type species is evidently 

 widely distributed and persists through a considerable part of the 

 growing season. 



Key to species 



a Basal clasp segment with the apical lobe broadly rounded, smooth . 



(M y c o d i p 1 o s i s) a c e r i n a Felt, C. 243, 269, 270, 548, 688, 699 

 aa Basal clasp segment with a long, setose lobe apically 



(M y c o d i p 1 o s i s) que rein a Felt, C. 271 



COQTJILLETTOMYIA U. g. 



This genus is allied to Mycodiplosis, since it has the anterior tar- 

 sal segments unidentate. It may be separated therefrom by the 

 conspicuous setose basal lobe at the internal angle of the basal 

 clasp segment. The ventral plate is about as long as the style and 

 broadly rounded apically, while the harpes are strongly chitinized. 



Type Mycodiplosis lobata Felt. 



Key to species 



a Abdomen dark salmon, the internal lobe of the basal clasp segment short, 

 broad, naked, the ventral plate slightly emarginate;- harpes incon- 

 spicuous (Mycodiplosis) lobata Felt, C. 176 



aa Abdomen yellowish, the internal lobe o'f the basal clasp segment short, 

 stout, setose, the ventral plate broadly rounded ; harpes short, spined 



apically t e x a n a n. sp., C. 31728 



aaa Abdomen light brown, the internal lobe of the basal clasp segment long, 

 setose ; ventral plate broadl}^ rounded ; harpes long, terminating in a 

 heavy, curved, chitinous process d e n t a t a n. sp., C. 622 



KARSHOMYIA U. g. 



The form referable to this genus is a small, yellowish brown 

 banded species allied to Lobodiplosis Felt and easily distinguished 

 therefrom by the unique genitalia. The stout basal clasp segment 

 bears a broadly dilated, subfusiform terminal clasp segment; the 

 harpes are strongly chitinized and very complex [pi. 41, fig. i]. 

 The wing is shown on plate 38, figure 7. Type and sole species, 

 Mycodiplosis viburni Felt, Cecid. 89. 



YOUNGOMYIA n. g. 



This genus comprises several rather large, brownish Diplosids 

 allied to Mycodiplosis and distinguished therefrom by the peculiar 

 genitalia. The terminal clasp segment is greatly produced, being 

 distinctly longer than the basal clasp segment, which latter has a 



