610 PROCEEDINGS OF THE ACADEMY OF [Aug., 



8. Ventral surface of abdomen with two light bands, .... 9. 

 Ventral surface of abdomen dark, with at most minute light 



marks, 10, 



9. Markings yellow, crucis, Ckll. 



Markings white, vierecki, Ckll. 



10. Labrum with a black spot; wings nearly clear, with a dark apical 



cloud, neomexicana, Ckll. 



I^abrum without a black spot; wings very dark, 



tiftoneiisis, Ckll. 



Nomada modesta, Cresson. 



Originally described from Maine and Illinois. Robertson docs not 

 find it near Carlinsville, 111., however. The specimens before me 

 are from Riverton, N. J., both sexes (Viereck); Dakota, one ? ; Colo- 

 rado, one d^. The Riverton specimens were taken August 3. A 

 female from Anglesea, N. J., was taken by Mr. Viereck, August 8, 1901. 



Nomada modesta var. rivertonensis, n. var. 



This is really a mutation, lacking the spots on the metathorax; a 

 specific character in other cases. One ? , Riverton, N. J., August 

 ( Viereck) . 



Nomada modesta var. vegana, n. var. 



? . — Rather small ; clypeus ferruginous. Apparently a geographi- 

 cal race. Las Vegas, N. M., July 12, 1899 {A. Garlick); Colorado 

 Springs, Colo., middle of July (Cockerell). The subgenus Microno- 

 mada was founded on this form. 



Nomada tiftonensis, sp. n. 



c?. — Length about 7 mm.; in sculpture and markings like a small 

 modesta, but lateral face-marks receding from orbits at end; meta- 

 thorax all black; hind femora black behind except at base and apex; 

 and ventral surface of abdomen without yellow marks. Third antennal 

 joint longer than fourth; second submarginal cell very Inroad above. 

 (Jne specimen has the supraclypeal mark subobsolete. 



Hab. — Tifton, Ga., collector unknown. Two in Coll. of Acad. Nat. 

 Sci. Phila. 

 Nomada crassula, sp. n. 



9 . — Length about 9 mm. ; black with yellow markings, general ap- 

 ]3earance like modesta, but abdomen broader, and sculpture of meso- 

 thorax and vertex considerably coarser. Face-marks pale yellow, lat- 

 eral marks shaped as in modesta, but there is no supraclypeal mark, and 

 a band of black runs down each side of clypeus, while there is a black 

 triangle, cutting into the lateral marks, on the lower part of the anterior 

 orbital margin. Labrum densely pubescent; antennae as in modesta, 



