236 U.S. NATIONAL MUSEUM BULLETIN 277 



knob white, except base red-brown. Front leg orange, except tarsus 

 darkening to red-brown; middle leg orange-brown, tarsus darkening 

 to red-brown ; hind leg entirely red-brown. 



Abdomen segments 2-5 black, with a metallic luster, covered with 

 short hairs, lateral portions interrupted with white membrane. 

 Eighth segment red-brown, eighth sternum deeply excavated along 

 posterior margin; see figure for details. 



Length: Male body 6 mm., wing 4 mm.; female body 7.3 mm., 

 wing 4.3 mm. 



Type-locality: 1 mi. w. Cajon, San Bernardino Co., California, 

 24 December 1957 (A. M. Barnes). 



Holotype: Male (USNM) 67472. 



Allotype: Female, 1 mi. e. Cajon, California, 24 December 1957 

 (A. M. Barnes) reared from larvae in woodrat's nest (USNM). 



159. Pseudatrichia cloudcrofti, new species 



Figure 153 



Pseudatrichia unicolor Cresson (not Coquillett), 1907, p. 113. 



Female.^ — ^Head red-brown, longer than high; back of head ex- 

 cavated, pollinose; eyes black-brown; postocular ridge moderately 

 wide, subshining; frons dark red-brown, elongate, not wider than 

 ocellar triangle which is cut off but not prominent, ocelli clear. Mouth- 

 parts well developed, orange-brown, extending a little over half the 

 length of the oral opening; palpi orange, a little shorter. Antennae 

 with first two segments red-brown, third segment orange; see figure 

 for details. 



Thorax dorsum dark red-brown, granular; humeral and supra-alar 

 calli orange-brown; pleura red-brown. Wings dusted brown, veins 

 brown; halter stem brown, knob base and dorsal rib brown, rest 

 white. Foreleg coxa straw colored, remainder of leg orange-broAvn ; 

 middle and hind legs orange-brown. 



Abdomen second segment red-brown, granular; remainder red- 

 brown, shining. Eighth segment light red-brown, sternum with three 

 points on posterior margin; see figure for details. 



Male. — Unknown. 



Length: Female body 7 mm., wing 4.4 mm. 



Type-locaUty: Cloudcroft, New Mexico; 16 June 1902. 



Holotype: Female (ANS). 



160. Pseudatrichia cockerelli, new species 



Figure 154 



Male. — Head red-brown; eyes black, divided into larger upper and 

 smaller lower facets along the midline. Frons triangular, subshining. 



