92 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ii5 



as a more complete description of the species, based on a male speci- 

 men in USNM: Mono Lake, Mono Co., June 6, 1948, W. 



Head yellowish-brown, except antennal pedicels and mouthparts 

 which are blackish-brown. Antenna yellowish with tip infuscate and 

 with fuscous band near middle. Antennal ratio 1.64. Eyes with 

 conspicuous narrow dorsal extension. 



Thorax, except for yellowish pronotum, humeri, and scutellum, dark 

 brown ; middle and lateral vittae separated by paler hne along dorso- 

 lateral bristle row; medial vittae separated by reddish-brown line 

 along dorsomedial bristle row; dorsum heavily pollinose. Prothorax 

 narrowed medially, evanescent, considerably inferior to mesonotum; 

 with 6 to 8 very fine lateral bristles. Prealar bristles about 15; dorso- 

 lateral and dorsomedial bristles in single rows with dorsomedial bristles 

 doubled for about 6 hairs posteriorly, terminating before scutellum; 

 anterolateral bristles about 15. Halteres stramineous. Scutellum 

 rubbed. Sternopleuron dark reddish-brown. 



Fore leg proportions: 68:87:58:32:23:14:9. Fore leg ratio 0.67. 

 Legs stramineous; dark brown annulus at distal end of femur and 

 proximal end of tibia, separated from joint by distance equal to width 

 of bands; tips of tibiae and tarsal joints 1 to 3 dark brown; distal 

 half of fourth and all of fifth dark brown. Fore tarsi with beard 

 slightly less than 3 times tarsal diameter; middle and hind legs with 

 long pale hairs. 



Wings with numerous spots on hyaline background ; Hi+s terminates 

 slightly distal to Cui ; Cu2 sharply bent downward, terminating half 

 way between Ri and R2+3- Wing length 3.15 mm. Venarum ratio 

 0.90. 



Each abdominal segment with basal dark brown, rather mottled, 

 fascia, inconspicuous and narrow on segments I and II, progressively 

 broadens until segment VII ahnost completely dark. Each abdominal 

 segment with apical poUinose, mottled white fascia; prominent on 

 segments I and II, decreasing apicaUy. 



Alales: Wing length, range 2.32-3.18; mean 2.88 mm. (8); fore leg 

 ratio, range 0.64-0.73; mean 0.69 (6); antennal ratio, range, 1.52- 

 2.08; mean 1.81 (8); venarum ratio, range 0.80-0.92; mean 0.87 (8). 



Females: Wing length, range 2.52-3.07; mean 2.73 mm. (3); fore 

 leg ratio 0.58, 0.66 (2) ; venarum ratio, range 0.88-0.92; mean 0.90 (3). 



Material examined: In USNM: 1 male. Mono Lake, June 7, 1948, 

 W; 1 male, 1 female, Deer Creek Hot Springs, Tulare Co., Aug. 6, 



1947, W; 2 males, 2 females, Wheeler's Springs, Ventura Co., June 16, 



1948, W; 1 male, Grangeville, Kings Co., July 31, 1947, W; 1 male, 

 Sanger, Fresno Co., Oct. 14, 1947; 1 male, Reedley, Fresno Co., Oct., 

 1947; 1 female, VisaUa, June 30, 1947, W; 1 female, Shafter, Kern Co., 



