20 U.S. NATIONAL MUSEUM BULLETIN 277 



smaller lower facets; frons granular with a median depression above 

 the antennae. The third antennal segment is broader at the base and 

 shorter than normal for the group. 



Thorax red-brown, covered with a thin pile of short hairs. Wings 

 milky with light brown veins. Halter stem brown, knob cream. The 

 legs are light brown with the basal portion of the tarsi yeUow darkening 

 distally. 



Abdomen red-brown with three white bands. Genital segments as 

 figured. 



F EM ALE . — Unknown . 



Length: Male body 4 mm., wing 2.8 mm. 



Type-locality: Biskra, Algeria; May 1891 (Handrich). 



Type: (NMV). 



3. Scenopinus aquelonius, new species 



Figure 4 



Female. — A large fly with the typical S. fenestralis appearance 

 except for the antennae which are shortened and pear-shaped. 



Head black, eyes red-brown, postocular flange broad and subshin- 

 ing, frons wide, subshining, with a median groove, a shaUow depression 

 in the lower half. Back of the head concave; mouthparts brown, well 

 developed; a shiny band of integument between the silvery pilosity 

 lining the oral cavity and the lower eye margin. The ocellar tubercle 

 red-brown, set off slightly from the frons; ocelli tan. The first antennal 

 segment short, black; the second red-brown and twice as long as the 

 first; the third segment dark red-brown, pear-shaped, twice as long 

 as broad. 



Thorax black; thinly covered with short silvery hairs, a patch of 

 silvery pile above the red-brown humeral callus; supra-alar callus 

 orange. Wings smoky brown, veins red -brown; halter stem brown, 

 knob red-brown. Legs: femora and tibiae red-brown, tarsi brown. 



Abdomen broad, dark red-brown; see figure for distinguishing 

 characters of 8th sternum and bursa. 



Male . — Unknown . 



Length: Female body 5 mm., wing 3.5 mm. 



Type-locality: Trinity Valley, B.C., Canada; 8 August 1928 (R. T. 

 Turner) . 



Holotype: Female (CNC) 8632. 



Paratype: Female, same locahty, July 1937 (K. Graham) (CNC). 



