230 U.S. NATIONAL MUSEUM BULLETIN 2 77 



moderately thick ; aedeagus with bilobed parameres with median barb- 

 like projections; see figure for details. 



Female. — Head black; eyes black-brown; postocular ridge broad, 

 siibshining; frons slightly wider than ocellar triangle, striated and 

 with a median depression; facial areas below antennae with silvery 

 pile; ocellar triangle set off, not prominent; antennae black-brown; 

 see figure for details. 



Thorax as in male. 



Abdomen as in male, except eighth sternum black-brown with a 

 shallow concave posterior margin with rounded lateral points; see 

 figure for details. 



Length: Male body 5.2 mm., wing 3.2 mm.; female body 5.1-5.5 

 mm., wing 3.3-3.6 mm. 



Type-locality: 3 mi. s. Glenn ville, Kern Co., California; 18 

 February 1959 (A. M. Barnes) reared from woodrat nest. 



Holotype: Male (USNM) 67464. 



Allotype: Female, same data as type (USNM). 



Paratype: 1 cf , 5 9 9, same data as type; 1 cf , 7 mi. s., 5.6 mi. 

 e. Tehachapi, Kern Co., California, 19 February 1953 (A. M. Barnes) 

 (AMB). 



155. Pseudatrichia biacristerna, new species 



Figure 149 



Female. — Head red-brown; eyes red-brown, with a wide post- 

 ocular flange behind the eyes; frons shining, with two diverging 

 bands of short hairs from median ocellus to antennal bases; ocellar 

 triangle cut off, not prominent; ocelli orange; mouthparts well de- 

 veloped, palpi half the length of the oral cavity. Antennae red-brown, 

 third segment covered with short hairs that reflect golden; see figure 

 for details. 



Thorax dorsum black, with transverse striations; humeral and 

 supra-alar calli red-brown; pleura red-brown. Wings clear, veins 

 brown; halter stem brown, knob white except for base red-brown; 

 legs orange. 



Abdomen black, metallic, intersegmental membrane brown medial- 

 ly, white laterally; eighth segment red-brown; sternum with two 

 sharp lateral points; see figure for details. 



Male. — Unknown. 



Length: Female body 5.5-6.5 mm., wing 3.7-4.3 mm. 



Type-locality: Santa Fe, New Mexico; August (T. D. A. 

 Cockerell) . 



Holotype: Female (USNIM) 67469. 



Paratypes: 2 9 9, Santa Fe, New Mexico, July, August (A. 

 Boyle; Cockerell nos. 1405, 1935) (USNM); 1 9, Santa Fe, New 



