274 U.S. NATIONAL MUSEUM BULLETIN 2 77 



middle leg with coxa yellow, femur and tibia yellow-brown, tarsus 

 brown ; hind leg with coxa orange-brown, femur red-brown, tibia brown, 

 first tarsal segment yellow-brown, remainder brown. 



Abdomen black-brown, rugose, eighth segment red-brown, sternum 

 undulating along posterior margin, lateral lobes shallow; see figure for 

 details. 



Length: Male body 6-6.3 mm., wing 4 mm.; female body 6.5 

 mm., wing 4.3 mm. 



Type-locality: Las Vegas, New Mexico; July 19 — (T. D. A. 

 Cockerell) . 



Type: (USNM) 47n. 



Other specimens seen: Icf, 19, Las Vegas, New Mexico, 3, 11 

 August (H. S. Barber) ; 1 cf , Watrous, New Mexico, Cockerell no. 2503, 

 all (USNM). 



Genus Belosta D. E. Hardy 



Belosta D. E. Hardy, 1944a, p. 37. 



Type-species Belosta albipUosa Hardy (original designation). The 

 genus Belosta D. E. Hardy is closely related to the genus Pseudatrichia 

 from which it was removed because of the head being higher than long, 

 atrophied mouthparts and generally hairy condition. It has a closed 

 cell R5. The members of this genus are found in the western mountain 

 area of the United States where the larvae are predators of wood 

 attacking insects. 



Key to the Species of Belosta 



1. Males, eyes close together 2 



Females, eyes widely separated 4 



2. Halter knob white 3 



Halter knob tan, thorax with short white hairs . . . . B. albipilosa Hardy 



3. Halter knob all white, thorax with long white hair . . B. pilosa (Coquillett) 

 Halter knob white above with a tan rim and ventral surface, thorax with 



very short scale-like hairs B. viticolapennis, new species 



4. Halter knob orange 5 



Halter knob red-brown 6 



5. Thorax with mixed short red and white hairs, 7th sternum short, abrupt 



B. albipilosa Hardy 

 Thorax with short white hairs only, 7th sternum long, sloping 



B. pilosa (Coquillett) 



6. Halter knob red-brown except ventral tip white . . . B. telfordi, new species 

 Halter knob red-brown above cream below . . . B. termitophaga, new species 



