270 U.S. NATIONAL MUSEUM BULLETIN 2 77 



181. Pseudatrichia toupeta, new species 



Figure 175 



Male. — Head red-brown; eyes red-brown above a little darker 

 below, nearly meeting on upper part of frons; frons rugose above 

 antennae, continuing narrowly between eyes to ocellar triangle; 

 ocellar tubercle black-brown, ocelli orange. Antennae with first two 

 segments red-brown, third segment orange-brown, covered with short 

 hairs giving a golden glint; see figure for details. 



Thorax dorsum black-brown, rugose, transversely striated; humeral 

 and supra-alar calli orange-brown; scutellum red-brown; pleural areas 

 red-brown. Wings brownish, veins brown; halter stem brown, knob 

 with dorsal portion light brown remainder white. Legs orange to 

 orange-brown. 



Abdomen red-brown, rugose with purple metallic glints; ninth 

 tergum irregularly shaped; sternum with long black hair like a toupee, 

 ninth segment claspers hairy, aedeagus with two strong prongs; see 

 figure for details. 



Female. — ^ Unknown. 



Length: Male body 6 mm., wing 3.6 mm. 



Type-locality: "Colorado." 



Holotype: Male (USNM) 67467. 



182. Pseudatrichia truncata, new species 



Figure 176 



Male. — Head lost. 



Thorax dorsum black, granular with fine transverse striations; 

 humeral and supra-alar calli red-brown; pleural areas black. Wing 

 clear, veins brown; halter stem brown, knob with basal portion red- 

 brown, distal portion white with a bleeding of brown into it. Legs 

 red-brown. 



Abdomen second segment black with two small lateral white areas 

 on the intersegmental membrane; remaining segments black with 

 white areas on intersegmental membranes wider, central dark band 

 maintained. Ninth tergum brown-black; sternum with a sparse comb 

 of short thick hairs. Aedeagus bilobed with posteriorly directed spur- 

 like prongs; see figure for details. 



Female. — Unknown. 



Length: Male body 5.2 mm. est., wing 3.5 mm. 



Type-locahty: Mexico City, Mexico; 18 May (Juan Muller). 



Holotype: Male (USNM) 67471. 



