202 U.S. NATIONAL MUSEUM BULLETIN 277 



cream to white. Legs: femora black-brown, tibiae brown, tarsi brown 

 darkening distally. 



Abdomen red-brown with narrow cream to white bands along 

 posterior margins; ninth tergum white with red-brown basal spot; 

 aedeagal spines short, knobbed. See figm'e for details. 



Female. — Head cream; eyes red-brown, metallic; postocular ridge 

 moderately wide, unmarked, divided on the midline; frons broad, 

 unmarked; ocellar tubercle red-brown, frosted gray pollen; ocelli 

 orange ; a groove running from corner of eye to back margin of ocellar 

 tubercle. Antennae with first two segments orange, third segment 

 brown. See figure for details. 



Thorax dorsum red-brown, with a median and two lateral bands, 

 yellow above humeral callus, lateral margins and median area ahead 

 of scutellum tan, with two anterior bands nearly separating median 

 and lateral bands; scutellum yellow, with a central triangular patch 

 pointing posteriorly. Pleura with pro thorax cream; mesanepisternum 

 cream, with red-brown patch; mesokatepisternum red-brown; wings 

 smoky white, veins cream; halter stem brown, knob cream. Legs as 

 in the male. 



Abdomen red-brown with tan posterior margins grading to yellow- 

 brown posteriorly; eighth segment red-brown; ninth tergite with a 

 marginal fringe of hairs instead of spines. See figure for details. 



Length: Male body 2.5 mm., wing L7 mm.; female body 2.5 mm., 

 wing 1.7 mm. 



Type-locality: Beaver Dam, Arizona; 20 June 1939 (Timberlake) . 



Holotype: Male (CAS) 8919 (ex [PHT]). 



Allotype: Female, same data (CAS). 



Paratype:l cf. Palm Springs, California; 24 June 1952 (Timber- 

 lake), (PHT). 



139. Brevitrichia oculivirida, new species 



Figure 133 



Male. — Head tan; eyes blue-green, metallic above, darker below, 

 very brilliant under the proper light; frons small, triangular; ocellar 

 tubercle red-brown, covered with gray pollen; back of head brown. 

 Antennae with first segment brown; second segment orange-brown; 

 third segment black -brown; see figure for details. 



Thorax dorsum black-brown, except for lateral margins yellow, 

 covered Avith alternate longitudinal bands of tan and gray pollen, 

 humeral and supra-alar calli cream, scutellum cream with a broad 

 central spot of black-brown. Prothorax cream, mesanepisternum yel- 

 low with usual red-brown spot, mesokatepisternum red-brown, with 

 upper margin yellow, pollinose; wings hyaline, veins tan; halter stem 

 brown, knob tan. Legs red-brown except knees of femora yellow. 



