86 U. S. NATIONAL MUSEUM BULLETIN 2 1 6 part 3 



linear with the median tyloids usually a little widened and rounded 

 above, ovipositor sheath about 0.40 as long as front wing, ovipositor 

 a little more compressed, and ovipositor tip about as in figure 327,n. 



Male: Black. Clypeus often light brown medially; mandible 

 white, fulvous apically; palpi white, their last segment fuscous; fla- 

 gellum stramineous below, near middle whitish below, medially with a 

 white band or dorsal white stripe that covers about 10 segments; 

 tyloids pale brown; tegula white, its apex light brown; front and mid- 

 dle coxae and trochanters entirely white or the coxae brownish basally 

 and the trochanters with a brownish stripe above; front and middle 

 legs beyond trochanters fulvous, their tarsi brown apically; hind coxa 

 black to brown, usually pale brown or whitish apically; hind first 

 trochanter entirely brown or partly fulvous, sometimes whitish below; 

 hind second trochanter and hind femur fulvous, the apical 0.15 ± of 

 the femur fuscous; hind tibia fuscous, fading to pale fulvous basally; 

 hind tarsus white, the apex of its fifth segment fuscous and rarely its 

 first segment with a subbasal infuscation; wings hyaline; apical 0.3 ± 

 of first abdominal segment often ferruginous; tergites 2 and 3 ferrugi- 

 nous, in dwarf specimens sometimes with an apical fuscous band; 

 tergite 4 ferruginous, usually more or less of its apex fuscous; tergite 

 6 often mth a small median apical white spot; tergite 7 with a median 

 apical white spot except occasionally in dwarf specimens. 



Female: Black. Center of clypeus often brown; mandible brown 

 subapically; segments 2 and 3 of maxillary palpus white, brown below, 

 the rest of maxillary palpus and all of labial palpus dark brown or 

 fuscous; antenna blackish brown, with a median white band that cov- 

 ers about 6 segments; tegula dark brown; front coxa and first tro- 

 chanter brown, the rest of front and middle legs fulvous, their fifth 

 tarsal segments mostly brown; hind coxa, trochanters, and femur 

 fulvous, the apical 0.15 of femur fuscous; hind tibia brownish fulvous, 

 infuscate apically; hind tarsus pale stramineous, the apical 0.5 ± of 

 its fifth segment dark brown and rarely its first segment with a weak 

 subbasal infuscation; wings hyaline; tergites 1-3 f ulvoferruginous ; 

 apical margin of tergite 5 sometimes with a white band ; apical margin 

 of tergite 6 always with a white band; tergite 7 with a very large 

 white area that covers all of its dorsal aspect except near basal mar- 

 gin; tergite 8 often with a small median white mark. 



Specimens (209 (^",1 369) : From Alabama (Pyriton in Clay Co.); 

 Connecticut (Hartford, North Haven, North Stonington, Pomfret, 

 South Meriden, and Storrs); District of Columbia (Washington); 

 Illinois; Louisiana (Gibsland); Maine (Bangor); Maryland (Annap- 

 olis, Cabin John, Odenton, Patuxent Refuge near Bowie, Plummers 

 Island, and Takoma Park); Massachusetts (Amherst, Cambridge, 

 Dorchester, Maiden, and WoUaston); Michigan (Ann Arbor, East 



