250 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



not very well developed, not reaching pedisulcus ; pedisulcus well de- 

 veloped at basal fourth of second segment. 



Abdomen : Tergite of segment i black, its midregion yellow, with 

 short black hairs ; pleurites of this segment black, with long dark hairs 

 reaching segment 5. Segment 2 black, the anterior half of tergite 

 white-pruinose, all with short black hairs. Other segments black with 

 short black hairs ; pleura of segments 6 and 7 white-pruinose. Ster- 

 nites tan. 



Genitalia: Sidepiece (pi. 26, fig. 100) quadrangular in shape, 

 width almost twice the length ; dorsal opening occupying about half 

 of dorsal surface of sidepiece. Clasper (pi. 26, fig. 100) long and 

 narrow, its length about five times its width, about i .6 times the length 

 of the sidepiece ; swelling on outer dorsal margin near base ; apex 

 rounded, somewhat truncate, with a single terminal spine. Body of 

 adminiculum (pi. 26, fig. loi) wider than long, somewhat rectangu- 

 lar in shape, its apex extended ; along its ventral surface there is a 

 longitudinal keel-like structure which is clothed with numerous hairs ; 

 basal processes well sclerotized, somewhat pointed. Adminicular 

 arms (pi. 26, fig. 102) with approximately 10 teeth, two to three near 

 base, the remainder forming a crownlike process at the apex ; lateral 

 plate oval, wrinkled. 



Female (pi. 33, figs. 220-222, and pi. 35, fig. 253). — 3.1 mm. long. 



Head: Dichoptic. Eyes black; base of fronto-ocular triangle 1.5 

 times the height. Antenna 580 11 long, 11 -segmented, slightly tapering ; 

 segment 3<i-|-2, 3=4-f5, 3>ii; scape and pedicel brown, flagellum 

 black. Palpi black. Frons black, white-pruinose, with 3 irregular 

 rows of black hairs along each margin. Clypeus black, white-pruinose, 

 with some short tan hairs. Occipital region black, white-pruinose, 

 with many long black hairs. Cornuae of buccopharyngeal apparatus 

 completely sclerotized, broad at bases, tapering to apical points ; me- 

 dian space small, hyaline, without teeth. 



Thorax : Mesonotum velvety black ; a white-pruinose triangle on 

 either side of midline, contiguous with anterior margin ; a single 

 white-pruinose longitudinal band extending from somewhat behind 

 each triangle to the prescutellar region which is also white-pruinose ; 

 short, narrow, pale-yellow, scalelike hairs completely clothing the 

 mesonotum, more dense on anterior half; few short black hairs along 

 anterior margin of mesonotum, several long black ones in prescutellar 

 region. Humeral angles black, evenly white-pruinose. Scutellum 

 black, white-pruinose, with long black hairs and yellow scalelike hairs. 

 Postnotum velvety black, evenly white-pruinose, devoid of hairs. 

 Pleura black, evenly white-pruinose. Stem of halter light brown, the 



