438 U. S. NATIONAL MUSEUM BULLETIN 216 parts 



male; areolet about 1.6 as wide as high; second tergite of female mat, 

 with rather small punctures that are separated by about 1.5 their dia- 

 meter; ovipositor sheath about 0.73 as long as front wing; ovipositor 

 about 6.1 as long from nodus to apex as it is deep at nodus. 



Male: Black. Anterior orbit (widened below), clypeus, and often 

 a broad median pair of stripes on face and clypeus, white, these white 

 areas often enlarged and fused; mandible white; segments 2-5 of 

 maxillary palpus white or the second and fifth segments more or less 

 brownish; labial palpus brown; all of tegula, or part, or a basal spot 

 on tegula, white; nearly always a short stripe at upper end of epomia, 

 often carinae at base of scutellum, often the subtegular ridge, front of 

 front coxa, usually apical part of front of middle coxa, and under side 

 of front and middle first trochanters, white; front and middle tro- 

 chanters dark brown except where white ; front and middle femora and 

 tibiae fulvous; front and middle tarsi pale fulvous, their fifth segments 

 blacldsh brown ; hind femur ferruginous, in the subspecies albinotatus 

 more or less infuscate basally, in both subspecies the apex a little 

 infuscate; hind tibia blackish, stained with ferruginous basally; hind 

 tarsus black, the apical part of its first segment sometimes, segment 2 

 usually, and segments 3-4 nearly always white (segments 3-4 reported 

 as sometimes black in the subspecies albinotatus, white in all of our 

 specimens of promptus) ; wings subhyaline or faintly infuscate ; abdo- 

 men ferruginous, black beyond the third, fourth, or fifth segment. 



Female: Black. Frontal and facial orbits usually with a narrow 

 white mark; labial palpus and basal one and a half segments of maxil- 

 lary palpus dark brown, the rest of maxillary palpus light bro^^^l; 

 flagellum with a median dorsal white stripe that covers 3 or 4 segments ; 

 subtegular ridge and small mark at upper end of epomia sometimes 

 white; tegula dark brown, with a whitish spot anteriorly; front and 

 middle femora and tibiae ferruginous, the tibiae often dusky above; 

 hind femur ferruginous, its apex a little infuscate, in the subspecies 

 albinotatus more or less infuscate basally; hind tibia dark brown or 

 black; tarsi light bro^^^l to dark brown, paler at the joints and seg- 

 ments 2-4 of hind tarsus paler than segments 1 and 5 of hind tarsus; 

 wings subhyaline to wealdy infuscate; abdomen ferruginous, usually 

 infuscate apically. 



There is a European and an American subspecies as keyed and 

 described below: 

 1. Tergite 4 black; hind femur ferruginous, often fuscous basally, its apex weakly 



infuscate; white markings on head, thorax, and trochanters of male averaging 



less extensive; range: Europe . . . la. albinotatus albinotatus Gravenhorst 

 Tergite 4 ferruginous; hind femur ferruginous, not infuscate basally, its apex 



weakly infuscate; white markings on head, thorax, and trochanters of male 



averaging more extensive; range: North America. 



lb. albinotatus promptus Cresson 



