132 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



with white pruinosity; other segments black. Sternites tan, white- 

 pruinose, with central black patch. 



Genitalia: Sidepiece (pi. 23, fig. 28) almost square, the length 

 and width being equal ; dorsal opening very large, following general 

 contours of sidepiece itself, covering approximately five-sixths of its 

 dorsal surface. Clasper (pi. 23, fig. 28) less than one-half the length 

 of sidepiece, the apex truncate with one heavy terminal spine arising 

 on distal end, somewhat removed from the inner apical angle ; well- 

 marked opening on basal half of clasper. Body of adminiculum 

 (pi. 23, fig. 30) circular; apex somewhat prolonged to form a crown 

 which is covered with long hairs ; hairs on remainder of body of ad- 

 miniculum shorter and appressed ; basal processes sclerotized, pointed, 

 with spurlike extensions near the apices. Adminicular arms (pi. 23, 

 fig. 29) usually with 10 teeth, the distal five being long, the others 

 noticeably shorter; lateral plate small, quadrangular, hyaline, with 

 numerous wrinkles that appear somewhat sclerotized. 



Female (pi. 29, figs. 145-147, and pi. 35, fig. 265). — 1.9 mm. long. 



Head : Dichoptic. Eyes yellowish brown ; height of f ronto-ocular 

 triangle about equal to its base. Antenna 510 jx long, ii-segmented 

 very slightly tapering; segment 3<i+2, 3<4 + 5, 3<ii; scape and 

 pedicel yellow, the flagellum light brown. Palpi brown. Frons and 

 clypeus black with white pruinosity. Occipital region black, with short 

 yellow scalelike hairs. Cornuae of buccopharyngeal apparatus very 

 wide, shovel-like, heavily sclerotized, with expansive membrane ; me- 

 dian space hyaline, with numerous very small sclerotized teeth. 



Thorax: Mesonotum velvety yellow; on either side of midline 

 there is a longitudinal stripe of white pruinosity that extends from 

 the anterior margin into the prescutellar region which is also white- 

 pruinose ; stripes of both sides parallel to one another ; wide band of 

 white pruinosity on each of the lateral margins of mesonotum ; few 

 long, narrow, yellow, scalelike hairs on anterior half of mesonotum, 

 in the prescutellar region, and on lateral margins above the wing in- 

 sertion; short black hairs along the periphery and on the anterior 

 fourth. Humeral angles light yellow, white-pruinose, and with yellow 

 hairs. Scutellum light yellow, with short, yellow, scalelike hairs and 

 with long black ones. Postnotum with anterior half dark brown, the 

 posterior half light yellow ; with light-yellow to white pruinosity, de- 

 void of hairs. Pleura yellow, with white pruinosity. Stem of halter 

 with dark-brown base and tan apex, knob tan. Wings, 2.4 mm. long 

 and 0.97 mm. wide ; relation of body length to wing, i : 1.3 ; Sc pilose 

 along basal half ; Ri completely pilose, also with spines along distal 



