236 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



along base of body, the ends of which extend into the basal processes ; 

 longitudinal keel-like structure, with numerous hairs, along ventral 

 surface ; entire ventral surface with numerous hairs ; club-shaped ex- 

 tension from the middle of basal margin of adminicular body, the 

 terminal expanded portion very hairy ; basal processes curved ven- 

 trally toward their ends, somewhat spatulate, with posteriorly directed 

 spurlike structures. Arms of adminiculum (pi. 26, fig. 93) with about 

 20 teeth arranged in linear fashion, fine long ones at regular intervals 

 and the remaining short ones intermixed ; lateral plate large, triangu- 

 lar, with few wrinkles. 



Female (pi. 33, figs. 211-213, and pi. 35, fig. 247). — 3.2 mm. long. 



Head: Dichoptic. Eyes very dark reddish brown; the base of 

 fronto-ocular triangle about equal to its height. Antenna 610 fi long, 

 1 1 -segmented, fiagellum tapering; segment 3=i-f2, 3 = 4 + 5, 3<ii; 

 scape and pedicel brown, flagellum black. Palpi black. Frons and 

 clypeus black, white-pruinose, irregularly covered with black hairs. 

 Occipital region black, irregularly covered with rather long black 

 hairs. Cornuae of buccopharyngeal apparatus heavily sclerotized, 

 almost triangular in shape, the angles pointed ; median space hyaline, 

 smooth. 



Thorax : Mesonotum velvety black ; 2 small quadrangular white- 

 pruinose patches on anterior margin, one on either side of midline; 

 from inner posterior angle of each patch extends a very narrow, longi- 

 tudinal stripe of white pruinosity that widens just before fusing with 

 the white pruinosity of the prescutellar region; lateral margins also 

 white-pruinose ; midline with very narrow stripe of white pruinosity ; 

 long, narrow, yellow, scalelike hairs on mesonotum, more numerous 

 on anterior fourth and along lateral margins ; short black hairs over 

 entire scutum, long, heavy black hairs in prescutellar region. Humeral 

 angles brown. Scutellum shiny black, with some long, heavy black 

 hairs and with narrow, yellow, scalelike hairs. Postnotum black, 

 completely white-pruinose, devoid of hairs. Pleura black, with white 

 pruinosity. Stem of halter with black base and brown apex, the knob 

 tan. Wings, 3.4 mm. long and 1.7 mm. wide ; relation of body length 

 to wing, I.I : I ; Sc pilose along basal sixth ; Ri pilose and spiny along 

 distal half; R2+3 pilose except for very small basal region; Cua ar- 

 cuate ; discal cell absent. 



Legs: Leg i, length, 3.4 mm.; coxa and trochanter dark brown; 

 basal three-fourths of femur dark brown, the apical fourth black; 

 basal and apical thirds of tibia black, the median third dark brown ; 

 tarsus black. Leg 2, length, 3.1 mm.; coxa, trochanter, and femur 

 black ; tibia light brown on basal three-fourths, black on apical fourth ; 



