156 U.S. NATIONAL MUSEUM BULLETIN 2 77 



Female. — Head red-brown; eyes dark red-brown with a narrow 

 postocular rim; frons rugose, swollen above antennae, with shallow 

 ventral groove ending in a pit on the lower fourth of the frontal area ; 

 ocellar tubercle indented, ocelli orange; oral opening bordered by 

 silvery pile ending squarely at base of swelling on front. 



Thorax dorsum dark red -brown; humeral callus orange-tipped; 

 pleural areas red-brown; wing hyaline, veins brown anteriorly, faint 

 behind. Halter stem brown, knob red-brown. Legs red-brown with 

 tarsi yellow-brown basally, darkening distally. 



Abdomen red-brown, shining. For details of eighth segment and 

 bursa, see figure. 



Length: Female body 3 mm., wing 2.3 mm.; male body 2.6 mm., 

 wing 2.1 mm. 



Type-locality: Yosemite National Park, California; 1 August 

 1940 (R. H. Beamer). 



Type: (UKan). 



Specimens seen: Icf, Clayton, Shasta Co., California, 15 July 

 1918 (E. P. Van Duzee) (CAS) ; 2cf cf , 3 9 9 , Friday Harbor, Wash- 

 ington, 25 July 1928 (M. Shackleford) (AMNH) ; 19, Victorville, 

 California, 30 May 1944 (A. L. Melander) (USNM) ; 19, s. fork 

 Santa Ana River, California, 30 July 1942 (A. L. Melander) (USNM). 



107. Scenopinus vanduzeei, new species 



Figure 105 

 Scenopinus nubilipes Cole (not Say), 1923, p. 462. 



This species is closely allied to S. mirabilis and can be distinguished 

 by the shorter truncate antennae, the free portion of R5 being much 

 longer than R4, the portion of M between the r-m and m cross veins 

 longer, and the aedeagus which has a strong median lobe flanked by 

 shorter parameres; cup of ejaculatory syringe blackish. 



Male.— Head dark red -brown; eyes red-brown above, dark red- 

 brown below; frons narrow, triangular, without a median groove; 

 ocellar tubercle prominent, ocelli clear to red-brown. Antenna with 

 first two segments red-brown; first segment half as large as second; 

 third segment dark red-brown, less than twice as long as wide, flat- 

 tened, a dimple in the center of the tip. 



Thorax dorsum black; humeral callus red-brown, pleura dark red- 

 brown. Wings milky white, veins light brown, halter stem red-brown, 

 knob white. Legs: foreleg with femur red-brown, tibia with distal 

 third orange-brown, tarsi orange; middle leg with femur and tibia 

 red-brown, tarsus orange-brown; hind leg with femur and tibia red- 

 brown, tarsus straw yellow darkening distally. 



Abdomen dark red-brown, segments 3-5 with broad white bands. 

 See figure for details of ninth segment and aedeagus. 



