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U.S. NATIONAL MUSEUM BULLETIN 277 



ing, ocelli reddish; first two antennal segments black-brown, the 

 first smaller than the second, the third segment black, oval, twice 

 as long as the first two combined. 



Thorax dorsum black, subshining; humeral and supra-alar calli 

 brown; wings smoky, veins brown to translucent; halter stem tan, 

 knob white; legs with femora and tibiae black, tarsi light brown. 



Abdomen black, shining, segments 3 and 4 white above, black 

 below, ninth segment black, normally hairy. See figure for details 

 of ninth tergum and aedeagal structure. 



Figure 98. — Scenopinus pecki, new species, male, female: a, wing; b, c, lateral and frontal 

 aspects of male head; d, e, frontal and lateral aspects of female head;/, g, enlarged details 

 of male and female antennae; h-j, ventral, lateral and posterior aspects of male terminalia; 

 k, ventral aspect of female 8th sternum; /, lateral aspect of female 8th and 9th segments; 

 m, female 9th sternum and bursa. 



Female. — Head black, shining; eyes red-brown, with a narrow 

 postocular ridge; frons subshining with transverse striations, mth 

 a slight swelling over base of antennae; ocellar tubercle set off, not 

 prominent; ocelli red; mouthparts normal; oral opening surrounded 

 by silvery pile. Antennae as in the male. 



Thorax as in male except halter stem black, knob light brown 

 above, white below. 



Abdomen black-brown; see figiu-e for details of eighth segment and 

 bursa. 



Length: Male body 2.3-2.8 mm., Aving 2 mm.; female body 

 3.3 mm., wing 1.8 mm. 



Type-locaUty: Scandia, Alberta, Canada; 10 Jidy 1956 (O. Peck) 

 swept from range grass. 



Holotype: Male (CNC) 8957. 



