158 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



In "Genera Insectorum" I united this with Mycomya, treating 

 it as a subgenus, for the reason that I did not consider the 

 fasciate wings of generic value, none of the other characters 

 being uniformly trustworthy. I restore it because I now 

 believe that in addition to the markings on the wing there are 

 sufficient structural characters which combined mark the genus 

 even though none of them can independently be relied upon. 

 The hypopygia while apparently differing from that of My- 

 comya are so varied and so complex in both genera that I have 

 not yet found a single character which could be used to separate 

 the two. 



Table of Species. 

 a. Media forks distad of the small cell R^ which is not more 

 than 3 times as long as wide, 

 b. Extremity of the wing not hyaline. 



c. Tergites of the first, third and fifth, and larger 

 part of sixth, segments dark brown ; a spot near 

 anterior margin of second and fourth segments 

 and produced in a median line, remaining parts 

 and venter, yellow ; entire dorsum sometimes 

 dark brown. Length 4 mm. (fig. 98). 



I. macularis n. sp. 

 cc. Intermediate abdominal segments each with a pair 

 of spots near posterior margin, sometimes obso- 

 lete ; length 5>4 mm. 2. didyma. 

 bb. Wing with broad subapical fascia, the apex of the wing 

 clear hyaline, 

 c. Spot which covers the R-M crossvein extends near- 

 Iv to the posterior wing margin ; small cell R^ 

 over twice as long as wide ; apex of subcosta 

 evanescent, 

 d. Subcostal crossvein is situated proximad of 

 the base of the small cell R^ ; (fig. 95). 



3. nept tenia. 

 dd. Subcostal crossvein is slightly distad of the 

 base of the small cell R^ ; (fig. 96). 



4. impatieus n. sp. 

 cc. The spot which covers the small cell and the cross- 

 vein does not reach the base of the fork of the 

 cubitus ; the subcostal crossvein is placed distad 



