288 NEW YORK STATE MUSEUM 



Halteres and legs practically as in the opposite sex; terminal 

 segment enlarged as a roundly triangular appendage having a length 

 about equal to that of a normal segment, the anterior margin with 

 a median round emargination ; lateral margins broadly rounded, the 

 distal narrowly so ; ventral ly at the posterior third there is a median 

 pair of subtriangular plates, the dorsal one with a length one-half 

 greater than its diameter, the ventral one-fourth the length of the 

 dorsal, broadly rounded posteriorly. Type Cecid. 1049. 



