ART. 5 GENERIC REVISION OF THE FOSSORIAL WASPS PARKER 179 



broad fasciae on tergites 1-5 all narrowly interrupted at midline, the 

 first broadest and narrowed abruptly at the midline, the remainder 

 slightly sinuate on either side the midline; large median spot on 

 sixth tergite; lateral spots on sternites 2-4, decreasing in size from 

 two to four; pair of small spots on anterior coxae; femora in part; 

 tibiae except line below; and tarsi, pale creamy yellow. The tarsi 

 are dark, almost ferruginous in color, and the maculations of the 

 tibiae and femora are a richer yellow than those on the body. 



This species differs from a typical species of the genus in that, 

 although the propodeum is concave on its posterior surface, the degree 

 of concavity is less than normal, and, furthermore, the posterior- 

 lateral angles, although prominent, are rounded instead of being 

 drawn out into sharp, wedgelike edges. It is further distinguished 

 by the fact that, although the specimen is a female, the second 

 sternite bears a pair of small sharp-pointed processes, which are the 

 posterior ends of a U-shaped ridge on the sternite. The intermediate 

 coxa bears a small tooth. The sixth tergite, which bears a well-de- 

 fined, heart-shaped pygidial area, ends in a sharp point, while the 

 broad apical end of the sixth sternite extends laterally on either side 

 the tergite (fig. 41) in a fashion characteristic of this species. 



The mandibles and the flagella are black. The wings are almost 

 hyaline. The pubescence on head and thorax is white, very fine, 

 and very short. The puncturing of the scutum and scutellum is 

 uniform, very fine, and very close, much finer and closer than in the 

 case of variegata or discisa^ with which species it has been compared. 

 It is a very unusual species. 



Length 14 mm. Described from a single female collected March, 

 1920, at Pie de Palo, San Juan, Argentina, South America, by J. 

 Chester Bradley, for whom the species is named. 



Type (female). — In the collection of Cornell University. 



BICYRTES PEXA, new species 



Tyjye (female). — Black: labrum; base of mandibles; clypeus, ex- 

 cept large triangular blotch at base; scape below; small spot be- 

 tween antennae; broad, but short, anterior orbits; posterior orbits 

 very narrow above ; broken fascia on posterior border of pronotum ; 

 posterior border on tubercles; spot on tagulae; spot on base of an- 

 terior wings; short, lateral lines on scutum at base of wings; small, 

 rounded lateral spots on scutellum ; narrow, arcuate fascia on dorsum 

 of propodeum; broad spot on its lateral angles; small spot near 

 base of wings on mesopleura; interrupted fasciae on tergites 1-5, 

 with width of interruption increasing from first to fifth, and all 

 fasciae narrowed toward the middorsal line, except the fifth; small 

 lateral spots on sixth ; lateral spots on sternites 2-4 ; spot on coxae ; 



