1903.] NATURAL SCIENCES OF PHILADELPHIA. 593 



Females. 



1. Legs with much yellow; clypeus yellow; metathorax all black, 



formula, Viereck, 

 Legs red, 2. 



2. JMarkings j-ellow; pimctures of mesothorax very coarse and dense 



(Las Vegas, N. M.), . . , modesta, Cress., var. vegana, Ckll. 



Markings cream-color; punctures of mesothorax well separated on 



a shining ground, vierecki, Ckll. 



Males. 



1. Apical plate of abdomen conspicuously notched; legs red, . 2. 

 Apical plate of abdomen rounded or truncate, with at most a feeble 



emargination, 5. 



2. Scape slender, 3. 



Scape swollen, yellow in front 4. 



3. Markings white, rUrccki, Ckll. 



Markings yellow, crucis, Ckll. 



4. Flagellum very long, entirely black above, denticulate ; lateral face- 



marks narrow, fragilis, Cress. 



Flagellum black above at base and 2h joints before the last; lateral 

 face-marks broad, scita. Cress. 



5. Legs red, 6. 



Legs with much yellow, 8. 



6. Face covered with white hair; scape swollen, yellow in front, 



so'phiarum, Ckll. 

 Face practically bare ; scape slender, 7. 



7. Abdomen broader; lateral spots, but no band, on third segment, 



lippia;, Ckll. 

 Abdomen narrower ; a band on third segment , neomexicana, Ckll. 



8. Supraclypcal mark present; metathorax with much yellow, 



suavis, Cress. 

 No supraclypeal mark; metathorax all black, . vei^ecunda, Cress. 



A^. vierecki, crucis, sophiarum, lippice and neomexicana have been 

 described in a paper sent to Annals and Mag. of N'at. History. The 

 A^. suavis before me is a single example from California, from the 

 National Museum. A^. fragilis I recognize in a specimen which I col- 

 lected at Pecos, N. M., June 21, 1903, at Salix. It is a Xanthidium, and 

 is not allied to the other species in the above table. The third antennal 

 joint is exceedingly short, and the basal nervure is a little basad of 

 the transverso-medial. 



Of N. scita I have before me five examples; one from Montana 

 (Acad. Nat. Sci. Phila.), the others from Colorado, apparent!}^ from 

 the Baker collection, bearing numbers 2,076 and 2,185 (National 

 iMuseum). 



Of N. verecunda I have l^efore me five from Nevada (Coll. of 

 38 



