\'ol. xxix] ENTOMOLOGICAL KEWS 169 



9. — Less elongate, broader. Abdomen more strongly convex. 

 Measurements. — $ — Length, 20.5-23.0 mm.; width, 6.0-6.5 m"!- 5 — 

 Length, 20.0-24.0 mm. ; width, 6.2-7.0 mm. 



Habitat. — Nogales, Santa Cruz Cotmty. Arizona, August 

 and September, 1906. Eleven specimens sttidied. Collected 

 by F. W. Nunenmacher. 



Types in my own collection ; type locality, Nogales, Arizona. 



Attenuata can be recognized by its smoother sculi)turing, 

 more attenuate and fusiform body. 



Some Bees of the Genus Panurginus (Hym.)- 



By T. D. A. CocKERELL, Boulder, Colorado. 



It is a remarkable thing that the northern genus Panurginus 



has penetrated to Southern South America ; while Perdita, so 



rich in species in our southwest, appears to be wholly absent 



from the South American desert regions. 



Panurginus callurus sp. n. 



9 . — Length nearly 5 mm., with broad abdomen ; head and thorax 

 black, abdomen clear orange-ferruginous, without hair-bands ; flagellum 

 short, bright ferruginous beneath, darker above ; mandibles bright fer- 

 ruginous, with the apex broadly black; hair of head and thorax whit- 

 ish, scanty, abundant on postscutellum ; facial quadrangle much broader 

 than long ; head and thorax shining and finely punctured, the mesothorax 

 and scutellum polished; eyes gray; tegulae light rufo-testaceous ; wings 

 hyaline, nervures and stigma testaceous ; b. n. falling far short of t. m. ; 

 base of metathorax with irregular plicae, and the surface microscopi- 

 cally reticulate; legs ferruginous, the anterior femora dusky; scopa of 

 hind tibiae loose, of simple curved hairs, which are microscopically an- 

 nulate; hind basitarsus about as long as the other joints together, and 

 much broader; claws cleft; abdomen with very little hair except at 

 apex. The stigma is smaller than in P. vagabnndiis. 



Carcarana, Argentina (L. Bremer 76). United States Na- 

 tional Museum. Easily known by the red abdomen. P. rufi- 

 vcntris Friese has also a red abdomen, btit the head and 

 thorax are dark blue. It is from Mexico. 



Panurginus vagabundus sp. n. 



$. — Length about 5 mm., anterior wing 4; black, the hind margins of 

 the abdominal segments rather obscurely castaneous ; pubescence scanty, 

 whitish; eyes slaty black; clypeus pale lemon yellow with two dark 



