288 THE CANADIAN. ENTOMOLOGIST. 



coxa, trochanters and basal third of femur light yellow ; remainder of 

 femur, tibia and tarsus dark brownish-black ; middle leg similar to fore, 

 but apical half of femur dark coloured ; hind leg similar to fore, but only 

 the apical third of the femur is dark, tibia paler brown ; tarsus as in fore 

 leg. Halteres rather long, yellow throughout. Abdomen above black, 

 the dorsum of each segment being paler in the basal two-thirds ; genitalia 

 black ; beneath dirty blackish-yellow. 



Wings hyaline, stigma rather indistinct, brown ; veins at base of wing 

 strongly yellow, giving this colour to the wing at this region ; subcosta is 

 yellow for its entire length, the other veins for a short distance only ; 

 radius and costa of a paler brown than the other veins. 



9 . — Similar to ^ , but genital segment light brown. 



Subcosta long, fork very close to tip, Scj being about twice as long as 

 Scj, ending anterior to cell R3. Radius long, cross-vein r at tip ; radial 

 sector often angulate, with a spur at the angulation, rather short, longer 

 than R2, but not as long as Rg. Vein Rg^g about equal to the basal 

 deflection of Cui Basal deflection of R4+5 shorter than R2+3 ; cross-vein 

 r-m two-thirds the length of the basal deflection of Cu^. Petiole of cell 

 M (vein Mi^a)^ variable in length, from as long as the r-m cross-vein, to 

 one and one-half the length of the basal deflection of Cu, or from two- 

 fifths the length of cell Mi to nearly twice as long as this cell. Very 

 considerable variation occurs in the two wings of the same specimen. 

 Basal deflection of Cui, under the middle of cell ist, Mg. Cu^ equal to, 

 or very little longer than, the basal deflection of Cu^. Cu^ + Mg about 

 equal to basal deflection of Cuj. Cells Rg, R5 and ist Mg usually in one 

 line. 



Length, ^, 5.9-6.3 mm.; 9, 6,5-7.3 mm.; wings, S , ? , 6.5 mm. 



Type. — (^ , Coy Glen, Ithaca, N. Y., May 21, 'ir. 



Co-types.— ? 9, Coy Glen, May 2i,'ii ; 9 , Six-Mile Creek, Ithaca, 

 N. Y., May 21, 'ir. (Thompson and Rutherford.) 



This species belongs to ihe/ra/n'a group, and appears to be closest 

 to costaiu Coq. from New Mexico ; kom fratria and costata it differs in 

 being much smaller and decidedly distinct in coloration. 



