pepsinae: tribe pepsini 69 



3. Median longitudinal ridge on subgenital plate narrow throughout; clypeus in 



front view with its apex truncate or weakly concave, or convex 4 



Median longitudinal ridge on subgenital plate very broad basally; clypeus in 

 front view with its apex strongly notched, either very broadly or rather nar- 

 rowly 6 



4. Median longitudinal ridge on subgenital plate with rather dense black hairs; 



wings black 1. hesperus (Banks) 



Median longitudinal ridge on subgenital plate without hairs that are dense or 

 denser than on the rest of its surface; wings blackish or largely yellow. 



SUBSPECIES OF TERMINATUM 5 



5. Wings entirely black 2a. terminatum subopacum (Cresson) 



Wings yellow, their apices broadly blackish. 



2b. terminatum terminatum (Say) 



6. Clypeus with a rather deep, U-shaped apical notch; longitudinal raised area on 



subgenital plate lanceolate, flat above and with sharp edges. 



5. severini Banks 



Clypeus with a broad shallow apical emargination; longitudinal raised area on 



subgenital plate elongate triangular, without sharp edges, subspecies of 



IDONEUM 7 



7. Wings entirely black 6a. idoneum idoneum Banks 



Wings yellow, their apices blackish .... 6b. idoneum birkmanni Banks 



FEMALES 



1. Flagellum entirely orange, or its basal segment partly fuscous; wings largely 



orange; body pubescence dark gray 2 



Flagellum entirely blackish; body pubescence blackish 3 



2. Mandible, when not worn, about 0.75 as long as the extreme width of the 



clypeus; apex of mandible not unusually broad; clypeus a little shorter and a 

 little more strongly convex; range: Arizona and California. 



3. pallidipenne (Banks) 

 Mandible, when not worn, about 0.85 as long as the extreme width of the 

 clypeus; apex of mandible broad; cl3^peus a little longer and a little less con- 

 vex; range: Tennessee, Louisiana, Texas, and Iowa. 4. attenuatum Banks 



3. Propodeum and metapleuron with close sharp transverse or oblique wrinkles; 



wings black; range: California, Oregon, Utah, and Nevada. 



1. hesperus (Banks) 

 Propodeum and metapleuron smooth or with fine weak wrinkles 4 



4. Apical margin of clypeus rather strongly concave; wings yellow, the apex of the 



forewing rather broadly black 5. severini Banks 



Apical margin of clypeus less strongly concave; wings black or yellow with the 

 apex of the forewing black 5 



5. Lower lateral corner of face with a dusky stramineous mark; clypeus in profile 



less convex, subspecies of idoneum 6 



Lower lateral corner of face without a pale mark; clypeus in profile more con- 

 vex, subspecies of terminatum 7 



6. Wings entirely black 6a. idoneum idoneum Banks 



Wings yellow, the apex of the forewing blackish. 



6b. idoneum birkmanni Banks 



7. Wings entirely black 2a. terminatum subopacum (Cresson) 



Wings yellow, infuscate apically . . . 2b. terminatum terminatum (Say) 



