ART. 5 GENERIC REVISION OF THE FOSSORIAL. WASPS PARKER 117 



fourth, and fifth biemarginate on anterior dorsal border; pair of 

 spots on apex of seventh tergite; second sternite, except pair of 

 anterior black spots and large medial longitudinal black spot ; lateral 

 spots on sternites 3-5 joined by narrow apical lines; coxae and 

 trochanters for the most part; femora, except line above on anterior 

 pair and basal spots on all; tibiae, except small basal spot on all 

 and small spot below on anterior pair ; and tarsi ; yellow. 



The posterior border of the middle femur on its apical half is 

 weakly dentate, the teeth being small, short, and blunt. The flagel- 

 lum is black and is neither spinose nor excavated, but segments 5-11 

 show specialized areas below and the apex of the terminal segment 

 is rufous. The second sternite bears a median, sharp-pointed, promi- 

 nent process, and the sixth, a short, broad and bluntly pointed 

 process that is slightly concave on its ventral surface. The seventh 

 sternite bears a median carina and at the base a pair of inconspicuous 

 lateral carinae. The genital stipes is distinct in form and bears a 

 conspicuous yellow maculation. 



The allotype (female) in color differs but little from the type; 

 the scutellum bears lateral spots instead of a fascia; only the fascia 

 on the second tergite incloses black spots; and the lateral spots on 

 the sternites are somewhat less extensive. The sixth tergite at its 

 apex bears a pair of yellow spots. The sixth sternite on the mid- 

 longitudinal line is destitute of punctures, but laterally at the base 

 it is densely and finely punctate, while at the apex the punctures are 

 very coarse. As on the type, the flagellum is black with the apex of 

 the terminal segment rufous. 



The wings of this species are hyaline and the pubescence white in 

 color and normal in development. The frons between the antennae 

 is but slightly carinate, and the clypeus is only moderately arched. 

 Among the paratypes is a female, from the same locality as the type, 

 that has the sixth tergite black, the anterior orbits interrupted, and, 

 together with a second female from the same locality, has the black 

 spots on the clypeus joined. Two male paratypes from Piura, Peru, 

 have the maculations in general much better developed. On these 

 specimens the black on the clypeus is lacking, the fasciae on tergites 

 two and three inclose black discal spots, and those on tergites one 

 and six are continuous. These two agree with the type in having 

 the genital stipes maculated. 



Length 16 mm. Described from three males and ten females. 

 Of these the type, allotype, and five female paratypes bear the label, 

 '' Rio Frio, Colombia, March 1924, H. W. Atkinson, Collector." The 

 tAvo male paratypes bear the label, " Piura, Peru, fls. Asclepiad Vine, 

 April 28, 1911 (Townsend)." Of the remaining females two bear 



