246 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



median space hyaline, without teeth, but with well-marked median 

 concavity. 



Thorax : Mesonotum velvety blue-black ; a triangular white-prui- 

 nose patch at anterior margin on either side of midline from which 

 extends a longitudinal white-pruinose band that unites with the prui- 

 nosity of the prescutellar region ; short, broad, yellow, scalelike hairs 

 on anterior fourth of mesonotum, on the lateral margins, and on pre- 

 scutellar region ; few long black hairs and several short tan hairs on 

 prescutellar region. Humeral angles brown, white-pruinose, with yel- 

 low scalelike hairs. Scutellum black, with long black hairs and short 

 tan ones. Postnotum black, white-pruinose, devoid of hairs. Pleura 

 evenly white-pruinose. Stem of halter reddish brown, the knob tan. 

 Wings, 2.8 mm. long and 1.3 mm. wide; relation of body length to 

 wings, I.I : i ; Sc pilose on basal four-fifths; Ri with hairs and spines 

 along apical three-fifths ; R2+3 pilose except for very small basal sec- 

 tion ; Cu2 arcuate ; discal cell absent. 



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

 with apical dark-brown ring; tibia with basal four-fifths tan, re- 

 mainder black ; tarsus black. Leg 2, length, 2.9 mm. ; coxa reddish 

 brown; trochanter tan; femur light brown with dark-brown apical 

 ring; tibia with basal four-fifths light brown, the remainder dark 

 brown ; basal half of basitarsus light brown, apical half dark ; tarsal 

 segments 2-5 dark brown. Leg 3, length, 3.6 mm. ; coxa dark brown ; 

 trochanter light brown ; femur and tibia light brown, with apical dark 

 ring; basal two-thirds of basitarsus and basal half of second tarsal 

 segment tan, the remainder of these segments, as well as all of tarsal 

 segments 3-5, black ; relation of basitarsus to second tarsal segment, 

 6:1; calcipala very long, passing beyond pedisulcus ; pedisulcus well 

 developed at basal third of second tarsal segment, deeply incised ; claw 

 with well-developed subbasal secondary spur (pi. 35, fig. 252). 



Abdomen : Tergite of segment i brown ; pleurites black with long 

 tan hairs reaching third segment. Segment 2 with tergite brown, the 

 pleurites black with white pruinosity. Tergites of other segments 

 black ; pleurites of segments 3-6 light brown ; few long black hairs on 

 last segment. Sternites light brown. 



Genitalia: Cercus (pi. 33, fig. 217) twice as high as it is long 

 (wide), subquadrangular, with a few long, strong hairs and numerous 

 minute spicules. Anal lobe (pi. 33, fig. 217) also much higher than 

 long (wide), curving somewhat under cercus; investiture similar to 

 that of cercus. Genital rod (pi. 33, fig. 219) with very much enlarged 

 basal dilatation ; apical expansions of arms of genital fork triangular 

 in shape, the outer angle and inner basal angle hyaline and rounded. 



