80 U.S. NATIONAL MUSEUM BULLETIN 2 83 



terior margin of the median vitta anterior to the flattened prescutellar 

 area; pleuron with an oblique brown band extending from posterior 

 side of fore coxa to end of scutellum. Scutellum with 5-6 long bristles. 



Legs pale yellow, with distinct dark brown markings including 

 narrow bases and apices of tibiae, a subapical band on mid femur, 

 and dark distal half of hind femur with a variable dark anterior line 

 toward its base. Legs long and slender, strong bristles only at apices 

 of femora and tibiae; strong ventral spines on tarsomeres I— III 

 present on mid leg only; IV unarmed, V with 1 pair of ventral baton- 

 nets on fore and mid leg, sometimes on hind leg; large claw long and 

 slender, subequal to V, the smaller appearing as a basal tooth about 

 half as long. 



Wing brownish with 2 pale anterior areas, one extending from 2RC 

 across cell R5 to (notata type) or past (f estiva type) stem M, the second 

 at wing margin just distad of costal tip; 2 prominent darker brown 

 spots, one covering vein R 1; IRC and r-m and the other including 

 distal swelling of vein R 4+5 and lying just behind it in cell R 5 ; veins 

 M and Cu also darkened somewhat; IRC well developed, usually 

 a fifth to third as long as 2RC; stem M long, about 3 times r-m. 

 Halter with stem pale, knob brown, the flat end (distal third) whitish 

 in some species. 



Abdomen yellowish with striking pattern of setation and intense 

 dark brown spots, differing specifically. Prominent clusters of strong 

 black setae mesally on terga II-IV in female, to V in male. Basic 

 color pattern fully expressed on IV in both sexes, consisting of a dark 

 brown area nearly covering tergum, containing a pair of oblique 

 pale lateral lines directed caudolaterad and a mesocaudal pair of 

 smaller pale spots. Posteriorly this dark pattern is reduced in extent 

 gradually toward VIII in males but usually only with triangular 

 anterolateral corners present in females. In f estiva type pattern, II 

 and III each bears a dark mesal spot at the seta clump and a pair of 

 anterolateral spots; in the male the median spot on III is obscure or 

 absent; in notata type pattern, the anterolateral spots are absent on 

 III in both sexes. Female sternum IX with short, bluntly pointed 

 submedian lobes on caudal margin; submedian internal lamellae 

 abruptly bent caudad mesally with sharp caudomesal points. Sperma- 

 thecae, 2 functional plus 1 rudimentary, the two subequal in size and 

 subspherical to slightly ovoid with short, slender, sclerotized necks. 

 Male genitalia with rounded tergum IX, short sternum IX with 

 shallow caudomesal emargination; basistyle short with broad mesal 

 expansion basally, a strong basidorsal process present, the processes 

 connected across midline by a weakly sclerotized band; dististyle 

 usually subequal in length to basistyle and rather stout and blunt 

 distally; aedeagus with lateral sclerites slender basally, gradually 

 expanded distally to laterally rounded apices; parameres subequal in 



