pepsinae: tribe pepsini 61 



Los Mochis in Sinaloa, Medellin in Vera Cruz, Oaxaca, TejupUco in 

 Temescaltepec, and Zetacuaro in Michoacan). 



Dates of capture are mostly from June to September, Those out- 

 side of this range are: April at Edinburgh, Tex.; May at Brownsville, 

 Tex.; May 17 at Burnet, Tex.; Oct. 4 at Camp Barkley, Taylor 

 County, Tex.; Oct. 15 in Brazos County, Tex.; and Dec. 10 at Los 

 Mochis, Sinaloa, Mexico. Flower records include only Euphorbia 

 marginata. 



This species is known only from Texas and Mexico. Adults are on 

 the wing through most of the growing season. 



7. Priocnemioides unifasciatus (Say) 



Forewing of male 9 to 17 mm. long, of female 10 to 21 mm. long; 

 temple rather swollen, so that the head across the temples is as wide 

 or a little wider than across the eyes; suberect hair on upper part of 

 pronotum moderately long; propodeum with rather fine but sharp 

 transverse wrinkling, most distinct in the female; seventh stemite of 

 male with a median longitudinal raised spatulate area. 



Black. Flagellum fulvous; ^vings varying from orange mth the 

 base and apex infuscate to entnely black, according to the subspecies. 



This species ranges from the United States to Patagonia, but is 

 represented in that area by a number of subspecies which because of 

 their evident color differences have been considered species. They 

 are structurally similar but with gradual geographic variation in some 

 of the characters which reach distinctive extremes at the ends of the 

 range. The structural differences between the subspecies, all minor, 

 are in the width of the head across the temples (widest in the Chilean 

 subspecies, thence gradually narrowing to the Nearctic subspecies 

 unifasciatus), the prominence of the raised spatulate area on the 

 male seventh sternite (most prominent in the Chilean subspecies, 

 thence gradually less prominent to the Nearctic subspecies uni- 

 fasciatus) and size (averaging smallest in the Chilean and Argentinean 

 subspecies and largest in the North American forms). In addition, 

 the Chilean subspecies has the flagellar segments somewhat shorter 

 than in the others. The color differences are described below, where 

 all the subspecies are treated, though only tlu-ee of them are Nearctic. 



Key to the subspecies of Priocnemioides unifasciatus 



1. Forewing entirely black; habitat: Peni, Bolivia, and parts of Paraguay and 



Brazil 7f. peruvianus (Rohwer) 



Forewing more or less orange 2 



2. Forewing black with a large subapical orange spot (pi. 2, fig. 18); habitat: 



United States east of the lOCth. meridian .... 7a. unifasciatus (Say) 



Forewing orange or infuscate orange with more or less of the base and apex 



fuscous 3 



347756—57 5 



