128 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



Thorax : Mesonotum yellow to orange, with narrow band of silver 

 pruinosity on either side of midline, broad at the anterior margin, ex- 

 tending to white pruinosity of prescutellar region ; the band of either 

 side is curved with convexity extended laterally, thereby forming a 

 lyre-shaped structure ; yellow coloration along the midline and along 

 the anterior limit of the prescutellar region ; golden scalelike hairs 

 along the periphery of mesonotum, more pronounced in the prescu- 

 tellar region; short black hairs evenly covering the anterior half of 

 mesonotum, few on posterior half, numerous on prescutellar region. 

 Humeral angles silvery-pruinose. Scutellum pale yellow, with long, 

 strong, black hairs and with some golden-yellow scalelike hairs. Post- 

 notum brown, with white pruinosity, devoid of hairs. Pleura yellow, 

 evenly white-pruinose. Stem of halter brown, the knob yellow, cup- 

 shaped. Wings, 3.1 mm. long and 1.3 mm. wide; relation of body 

 length to wing, 1:1; Sc pilose along basal three-fourths ; Ri com- 

 pletely pilose, its distal half also with spines ; R2+3 pilose except for 

 very small basal section ; Cu2 arcuate ; discal cell absent. 



Legs: Leg i, length, 2.8 mm.; coxa and trochanter pale yellow; 

 femur pale yellow, its distal third somewhat darker ; tibia light brown ; 

 tarsus black. Leg 2, length, 2.7 mm. ; coxa brown ; trochanter yellow ; 

 femur and tibia yellow with apical brown band ; basal half of basitar- 

 sus yellow, the apical half dark brown ; tarsal segments 2-5 dark 

 brown. Leg 3, length, 3.4 mm. ; coxa brown ; trochanter yellow ; femur 

 yellow with apical fourth dark ; tibia yellow on basal half, dark brown 

 on apical half, with 2 apical spines ; basal half of basitarsus and of 

 tarsal segment 2 yellow, the remainder of these segments, as well as 

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

 ment, 4.6 : I ; calcipala well developed, reaching the pedisulcus ; pedi- 

 sulcus well formed on basal third of second segment; claw with 

 submedian tooth (pi. 35, fig. 259). 



Abdomen: Tergite of segment i yellow, with white pruinosity; 

 pleurites pale yellow, with very long reddish-brown hairs. Tergite of 

 segment 2 yellow in front, brown behind ; pleurites velvety brown. 

 Segment 3 pale in middle, remainder velvety black. Other segments 

 velvety brown, the pleurites with some yellow pruinosity. Short black 

 hairs over entire abdomen. Sternites white-pruinose. 



Genitalia: Cercus (pi. 29, fig. 142) with height almost equal to 

 length (width), the posterior angles rounded. Anal lobe (pi. 29, 

 fig. 142) high, its height about three times its length (width), tapered 

 at both ends, with slight protuberance near middle which curves under 

 cercus. Genital rod (pi. 29, fig. 144) with slight basal dilatation; 

 apical expansions of arms of genital fork irregularly triangular in 



