Ko. 2173. A REVISION OF THE BEMBICINE WASPS— PARKER. 117 



The flagellum is tawny below, growing lighter toward the apex. 

 The second flagellar segment is not quite equal in length to the com- 

 bined length of the third and fourth. The ultimate segment is 

 shghtly curved, exceeds the length of the segment immediately pre- 

 ceding it, but is not equal to the combined length of the two immedi- 

 ately preceding it. The frons is wide, exceeding the width of the eye 

 at the leJvel of the insertion of the antennae, and the inner borders of 

 the eyes are almost parallel. The wings are long, reacliing almost 

 to the tip of the abdomen, hyaline and the veins are brown. The 

 pubescence is white ; on the head it is tolerably long and dense ; that 

 on the thorax, median segment and base of abdomen is shorter but 

 equally dense ; elsewhere on the abdomen it is very short, rather dense 

 and semi-erect. The punctation is of the usual character. 



Length. — 17 mm. 



This form runs in Handlirsch's table, although not accurately, to 

 B, occidentalis Fox; in Fox's table it runs to B. U-scripta Fox. It 

 differs from occidentalis in the broad frons, the eyes being not at all 

 divergent at the clypeus, in the form of the mandibles and in the rela- 

 tive length of the second flagellar segment; it differs from U-scripta 

 in the normal form of the ocelli and in the character of the develop- 

 ment of the ultimate tergite. Furthermore, it differs from both of 

 these species in the character of the maculations on the sternites. 



Described from a single specimen collected by F. H. Snow at Albu- 

 querque, New Mexico, in the year 1894. 



Type. — Female, in the collection of the University of Kansas. 



Genus MICROBEMBEX Patton. 



Mierohemhex Patton, Bull. U. S. Geol. Surv., vol. 5, 1879, p. 364. 



B. Bembeces aberantes ITandlirsch, Sitz. Akad. Wissensch. Wien, Math.-Nat. 



CI., vol. 102, 1893, p. 878. 

 Bembex Fox (part), Proc. Acad. Nat. Sci. Phila., 1894, p. 303. 

 Microbembex Fox, Proc. Acad. Nat. Sci. Phila., 1895, p. 363. 

 MicTobembex Kohl, Die Gatt. d. Spheg., 1896, p. 434. 



Type. — Bembex monodonta Say by original designation. 



The wasps belonging to this genus vary in length from 8 to 14 milli- 

 meters and are relatively more slender than those of the genus Bunbix. 

 The head is equal in width to the thorax. The compound eyes are 

 large, convex, and naked. The facets near the inner border are very 

 shghtly larger than those near the outer; this is more evident on the 

 male than on the female. The inner margins of the eyes are prac- 

 tically parallel and the lower border reaches the mandible. The 

 ©cellar cicatrices are similar to those of the genus Bembix, but are 

 almost concealed by the dense pubescence on the frons and vertex. 

 The occiput is very narrow, the posterior surface of the head concave, 

 and the temples almost wanting. The mandibles are long, slender, 

 pointed, and devoid of teeth. The maxillae are comparatively long, 



