234 U.S. NATIONAL MUSEUM BULLETIN 277 



Antennae with first segment black-brown, second and third segments 

 red-brown; see figure for details. 



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

 orange-brown; pleural areas black-brown; wings clear, veins dark 

 brown; halter stem black-brown; knob base and dorsal stripe brown, 

 dorsal rib and remainder white. 



Abdomen segments 2-5 black, rugose with purple metallic sheen; 

 segments 6 and 7 black, shining, ninth tergite red-brown, pointed 

 dorsally, sloping ventrally, sternal brush thick; aedeagus orange, very- 

 large, with two mesal peni prongs; see figure for details. 



Female. — Unknown. 



Length: Male body 5.5-6.5 mm., wing 3.7-4.5 mm. 



Type-locality: Keen Camp, Riverside Co., California; 17 May 

 1959 (E. I. Schlinger). 



Holotype: Male (UCalD) 72. 



Paratype: 1 d^, Hastings Reservation, near Jamesburg, Monterey 

 Co., Calif.; 3 May 1958 (D. D. Linsdale) (UCalB). 



158. Pseudatrichia cajoni, new species 



Figure 152 



Male. — Head lost. 



Thorax dorsum black, dusted with white hairs; humeral and 

 supra-alar calli red-brown; pleural areas black; wings clear, veins 

 brown; halter stem brown, knob white except base, brown. Forelegs, 

 coxa to tibia straw yellow, tarsus brown; middle leg, coxa to tibia 

 yellow-brown, tarsus brown; hind leg, coxa to tibia orange-brown, 

 tarsus brown. 



Abdomen, segments 2-5 black, with a purple metallic sheen; 

 segments 6 and 7 black, shining; tergum of segment 9 red-brown, 

 smoothly rounded dorsally and sloping below; sternal comb of hairs 

 long and thick; aedaegus very large; see figure for details. 



Female.^ — ^Head black, eyes red-brown; postocular flange not 

 prominent, rounded shining; back of head convex, granulose; frons, 

 with a smooth median band bordered on each side by a broad band of 

 short hairs, eye margins smooth, wider than the ocellar tubercle. 

 Ocellar tubercle prominent, set off, ocelli red. Mouthparts well- 

 developed, red-brown; palpi half the length of the oral opening, 

 sides of opening sUvery pilose. Antennae red-brown, second segment 

 shorter than first, third with silvery pubescence; see figure for details. 



Thorax dorsum black, with pollinose patch above humeral callus 

 and covered with short hairs giving it a dusty appearance; humeral 

 and supra-alar calli orange-brown with a white membrane connecting 

 them; pro thorax black with white pollen in front of coxa, remainder 

 of pleura black. Wings clear, veins brown, halter stem red-brown 



