254 Journal New York Entomological Society. [Vol. xxi. 



Sections of the fourth vein i : 4, of the fifth vein subequal. (Eur. ;* Col.*) 



nigripes Meigen, sens. str. Schiner. 



27. Second section of the costa about three times as long as the third section; 



fourth vein diverging from the third and ending much beyond the 

 wing-tip ; discal cell large, the segments of the fifth vein 3:2; wings 

 broad; third antennal joint very small, the arista long, slender and 



pubescent 28. 



Second section of the costa about four times as long as the third section ; 

 arista short, stout at base, and apparently bare 29. 



28. Front broader, about one third the width of the head, brownish ; abdomen 



black; frontal bristles fine. (D. C, N. J., Mass., Ont., 111.,* Wise.,* 



La.,* Kans., Tex.*) parvicornis Loew. 



Front narrower, less than one third the width of the head, the frontal 

 lunule with a rounded white spot ; abdomen black, in the J' the last 

 few segments yellowish; frontal bristles robust. (Pa., Mass.,* N. H., 

 Fla., 111.,* La.,* S. Dak.*) terminalis Coquillett. 



29. Discal cell large, the segments of the fifth vein 3:2; fourth vein ending 



far beyond the wing-tip, its segments about 2:5; four dorsocentrals ; 

 thorax lightly pollinose. (Eur. ;* Id.,* Wash.,* Ore.*) . .reptans Fallen. 

 First section of the fifth vein not greatly longer than the outer section ; 

 tip of the wing near the middle of the first posterior cell, the third 

 and fourth veins subparallel 30. 



30. Discal cell smaller than usual, the basal section of the fifth vein much 



shorter than the outer section ; the sections of the fourth vein about 

 1:5; root of the wing and the notopleural suture narrowly whitish ; 



at least the front knees yellow 3 1- 



Basal section of the fifth vein longer than or subequal to the outer section ; 

 the sections of the fourth vein about 1:3 32. 



31. Scutellum broadly yellow in the middle; interfrontalia yellow. (Wash.*) 



interfrontalis n. sp. 

 Scutellum black ; interfrontal sutures often striped with yellow above, but 

 otherwise the front is black. (Eur. ;* Mass.,* Id.,* Wash.*) 



luctuosa Meigen. 



32. A narrow yellow sutural line along the sides of the thorax, expanding be- 



neath the root of the wing; knees, front tibiae and the tarsi more or 

 less yellowish; frontal lunule white-pollinose ; wings broader. (Pa., 



N. J., Mass.,* Wise, 111.,* La., Wash.*) angulata Loew. 



Thorax not marked with a lateral yellow line ; legs generally darker ; front 



opaque black; wings narrower. (Nebr., Mass.,* D. C, Va., Fla., W. 



Ind., La., Tex., 111.,* Wise.,* S. Dak., Wash.,* AldiSks..) . .neptis Loew. 



23- Front broader than long, black, but yellow below; antennae entirely black; 



penultimate section of the fourth vein about one third as long as the 



ultimate section of the fifth vein. (W. Ind.) anthrax Williston. 



Front mostly yellow ; base of the antennas yellowish ; penultimate section of 

 the fourth vein two thirds as long as the ultimate section of the fifth 



