182 U.S. NATIONAL MUSEUM BULLETEST 2 77 



median stripe extending across scutellar sidcus into a point. Pleural 

 areas with prothorax cream; mesanepisterniim largely cream, with a 

 red-brown spot; mesokatepisternum red-brown, with a broad cream 

 band dorsally; all covered with gray pollen. Wings smoky, veins 

 cream; halter stem brown, knob cream. Legs: femora light red-brown, 

 pollinose; tibiae tan; tarsi tan, turning brown distally. 



Abdomen second segment red-brown basally, with a central stem 

 and lateral extensions in the form of a "T," remainder creamy white; 

 segment three with a narrow anterior band of red-brown, remainder 

 of segment and rest of abdomen white above. Ninth tergum yellow, 

 with a tan basal patch. See figure for details. 



Female. — Head tan; eyes red-brown, with a metallic sheen; 

 postocular ridge medium broad, extending across back of head, brown 

 patches laterad of corner of eye; frons broad, with a darker tan median 

 band flanking a median groove, sulcus from upper angles of eyes to 

 back of lateral ocelli; ocellar tubercle red-brown, dusted with gray 

 pollen; ocelli orange-red. Antennae with first two segments brown, 

 third segment orange-brown. See figure for details. 



Thorax dorsum with a black band on midline extending two-thirds 

 of the distance to scutellum, separated by thin orange-brown bands 

 from lateral black bands beginning behind the humeral callus but not 

 attaining the scutellar sulcus, remainder orange-brown, dusted gray 

 pollinose; humeral and supra-alar caUi orange-brown; pleural areas 

 with prothorax orange, mesokatepisternum black, with orange dorsal 

 band, all dusted gray pollinose. Wings hyaline, veins brown; halter 

 stem brown, knob orange. Legs with femora red-brown, pollinose; 

 tibiae tan; tarsi tan basally, brown distally. 



Abdomen with segments red-brown basally with "T"-shaped mark- 

 ings, lateral areas and posterior margins tan; eighth segment orange- 

 brown ; ninth tergum with 8 stiff spines and much fine hair. See figure 

 for details. 



Length: Male body 3.2 mm., wing 2.3 mm.; female body 3.7 mm., 

 wing 2.2 mm. 



Type-locaHty: Leeds, Utah; 15 September 1931 (E. W. Davis) 



Holotype: Male (USNM) 67482. 



Allotype: Female, Saint George, Utah; 15 June 1930 (E. W. Davis) 

 (USNM). 



127. Brevitrichia dicksoni, new species 



Figure 121 



Female. — Head tan; eyes black-brown; postocular ridge narrow 

 separated on the midline behind ocellar tubercle, with faint brown 

 bands laterad of the midline; front broad, with two bands of brown 

 hairs on either side of a bare midline, not attaining ocellar triangle; 



