pepsinae: tribe pepseni 33 



with two regular rows of bristles beneath ; tarsal claws ordinarily with 

 two to four erect acute teeth beneath, the basal ones often diflScult to 

 observe (the claws are reported as "bifid" in the Ethiopian Hemipepsis 

 commixta); empodium large, about 0.75 as wide as apical width of 

 last tarsal segment, with a regular apical fringe of about 14 to 40 

 setae (in all other Pepsinae the empodium is slender, about 0.5 as 

 wide as apical width of last tarsal segment, and with a sparser, less 

 regular fringe of about 8 setae) . 



This genus includes many large, strikingly colored species of the 

 Old World Tropics. In the New World it is replaced largely by the 

 genus Pepsis and is represented there by only a few species in Central 

 America and Mexico, of which three reach the southwestern United 

 States. Some of the names indicated in the generic synonymy are 

 used for subgenera by Arnold (1932, p. 291) and by Banks (1934, 

 loc. cit.). I have not tried to test their conclusions on the use of 

 subgenera, and for the present refer all of our Nearctic species to a 

 Hemipepsis without subgeneric divisions. 



Keys to the Nearctic species of Hemipepsis 



MALES 



1. Wings light brownish fuscous; flagelluni orange apically, blackish basally. 



3. mexicana (Cresson) 

 Wings mostly orange, fuscous at the base and apex; flagellum blackish ... 2 



2. Nervellus beyond the cubitella by 0.2 to 0.35 the average width of the sub- 



median cell; suberect hair on clypeus and face averaging about 0.6 as long 



as the median length of the clypeus 1. toussainti (Banks) 



Nervellus beyond the cubitella by about 0.6 the average width of the submedian 

 cell; suberect hair on clypeus and face averaging about 0.4 as long as the 

 median length of the clypeus. subspecies op ustulata 3 



3. Base of forewing infuscate for a distance equal to 0.5 or more the length of the 



anal lobe; base of hind wing infuscate for a distance equal to 0.8 or more the 

 length of the anal lobe; forewing averaging about 20 mm. long. 



2a. ustulata ustulata Dahlbom 



Base of forewing infuscate for a distance equal to about 0.3 the length of the 



anal lobe; base of hind wing infuscate for a distance equal to about 0.4 the 



length of the anal lobe, the lobe itself usually mostly fuscous; forewing 



averaging about 17 mm. long 2b. ustulata ochroptera St&l. 



FEMALES 



1. Flagellum beyond first segment orange 2 



Flagellum beyond first segment blackish, subspecies of ustulata .... 3 



2. Lateral ocellus separated from the eye by about 1.0 its diameter; clypeus with 



a subapical row of about 4 to 8 long suberect hairs, above which are a few 

 shorter suberect hairs that are less than a third as long as the subapical row; 

 long suberect hairs of head and thorax sparse; dorsal longitudinal carina on 

 hind tibia with only a weak ripple to indicate rudimentary teeth. 



3. mexicana (Cresson) 



