260 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 12$ 



expansion. Adminicular arms (pi. 27, fig. 108) heavily sclerotized, 

 with 2 long teeth near its midregion, and with one short, blunt tooth 

 and one longer one at the apex, giving a dome-shaped effect; lateral 

 plate quadrangular, slightly sclerotized. 



Female (pi. 34, figs. 226-228, and pi. 35, fig. 254). — 3.1 mm. long. 



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

 about equal to height. Antenna 580 /x, long, 11 -segmented, tapering; 

 segments i+2 = 3>4-F5, 3<ii; scape and pedicel brown, the flagel- 

 lum black. Palpi black. Frons black, white-pruinose, with 4 irregular 

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

 with 2 irregular rows of black hairs and a few tan hairs. Occipital 

 region black, white-pruinose, with many long black hairs. Cornuae 

 of buccopharyngeal apparatus well sclerotized, expanded and curved ; 

 median space hyaline, smooth, without central concavity. 



Thorax: Mesonotum velvety black; on either side of midline, 

 contiguous with the anterior margin, is a white-pruinose triangle; 

 posterior to each triangle there is a white-pruinose longitudinal band 

 that unites with the white pruinosity of the prescutellar region ; lateral 

 margins also white-pruinose; short, narrow, yellow, scalelike hairs 

 densely covering all of mesonotum, denser on anterior half, not in 

 packets; short black hairs over entire mesonotum, longer in prescu- 

 tellar region. Humeral angles black, evenly white-pruinose. Scutel- 

 lum black, with numerous yellowish scalelike hairs, longer than on 

 scutum, and several long black hairs. Postnotum velvety black, evenly 

 white-pruinose. Stem of halter brown, the knob yellowish white. 

 Wings, 3.6 mm. long and 1.3 mm. wide; relation of body length to 

 wing, 1 : 1.2 ; Sc pilose along its basal fifth ; Ri pilose and spiny along 

 the distal half ; R2+3 pilose along distal four-fifths ; Cug arcuate ; discal 

 cell absent. 



Legs: Leg i, length, 3.2 mm. ; coxa and trochanter yellow; femur 

 yellow with slight darkening at distal extremity, clothed with short, 

 flat, yellow hairs and stouter, longer, black hairs ; tibia light brown 

 on basal three-fourths, apical fourth dark brown ; tarsus black. Leg 2, 

 length, 2.8 mm. ; coxa dark brown ; trochanter yellow ; femur yellow 

 with dark apical ring ; tibia yellow along its basal three-fourths, black 

 on the apical fourth ; tarsus black with the exception of the basal half 

 of the basitarsus which is yellow. Leg 3, length, 3.9 mm. ; coxa black ; 

 trochanter yellow; femur and tibia yellow with apical black rings; 

 basal half of basitarsus and of second segment yellow, the remainder 

 of these segments, as well as all of segments 3-5, black; relation of 

 basitarsus to second segment, 4.7 : i ; calcipala well developed, not 

 reaching the pedisulcus ; pedisulcus well developed on basal third ; 



