2T6 CONNECTICUT GEOL, AND NAT. HIST. SURVEY [Bull. 



basal tooth. Male hypopygium with tergite and sternite distinct ; 8th 

 sternite usually provided with fleshy lobes, tufts of setae or hair- 

 pencils. Ovipositor with cerci long and slender, smooth; in hicomis 

 grouj), all valves short and fleshy. 



Includes the majority of the so-called "Subunicolores", having the 

 wings unmarked or virtually so, and with the obliterative area at the 

 cord forming a conspicuous lunule against the ground color. 



Key to Groups 



1. Wings with cell 1st M.i open by atrophy of in aperta (dorsimacula group) 



Wings with cell 1st M2 closed 2 



2. Wings with cell 1st M-i very small, pentagonal, the upper face (second sec- 



tion of Mi+a) shorter than or subequal to the petiole of cell Mx\ ovipositor 

 with short fleshy cerci ; male hypopygium enlarged, the tergite variously 

 armed with fleshy lobes (except in johnsoniana) ; 8th sternite without 



fleshy lobes bicornis group 



Wings with cell 1st M-- normally elongated, the upper face (second section 

 of M1+2) exceeding the petiole of cell Mi; ovipositor with slender sclero- 

 tized cerci ; male hypopygium variously constructed, if tergite bears fleshy 

 horns, the 8th sternite armed with lobes 3 



3. Male hypopygium with the basistyle produced caudad into a long spatulate 



blade ; wings with two large dark areas basad of the stigmal darkening, 



these inter-connected by a pale brown wash in cell R macrolabis group 



Male hypopygium with the basistyle not produced into a long spatulate blade ; 

 wings rarely with a dark pattern, where this most conspicuous {fuliginosa, 

 disjuncta, $ ) the wing-surface chiefly or entirely dark brown or black- 

 ened, or (fuliginosa, $ ; dorsimacula) without a well-defined dark area 

 basad of origin of Rs 4 



4. Male hypopygium asymmetrical, the right basistyle produced caudad into a 



conspicuous 2-cleft arm (Fig. 31, I) ; female with wing chiefly dark brown 



or blackish, variegated with whitish along cord and beyond stigma 



fuliginosa group 

 Male hypopygium symmetrical; female without blackened wings (except in 

 disjuncta, where these are uniformly darkened) dorsimacula group 



The hicornis or fascipennis group. 



Nasus short. Antennae of moderate length; flagellum usually 

 more or less bicolored. Wings with cell 1st Mo small, pentagonal. 

 Male hypopygium with ninth tergite usually tumid. Ovipositor with 

 small fleshy cerci. 



Key to Species 



1. Cell 1st Mo very small, the cephalic face (second section of M1+2) shorter 



than petiole of cell ]\h 2 



Cell 1st Ma more elongate, its outer end pointed; cephalic face subequal to 

 or even slightly longer than petiole of cell Mi 6 



2. Second section of vein M,+o with macrotrichia parshleyi 



Second section of vein Mj+j without macrotrichia, pale and included in the 



obliterative streak 3 



3. Cells C and So strongly inf umed ; veins comprising outer end of cell Ist Mo 



not obliterated morrisonl 



Cells C and Sc not or but slightly darkened; veins comprising cell 1st Ms, 

 with the exception of M:h4, pale and semi-obliterated 4 



4. Cell 1st M2 entirely pale megaura 



Cell 1st M-2 with both ends more or less darkened 5 



5. Vestiture of thorax relatively short parshleyi 



Vestiture of thorax long and conspicuous bicornis 



