Studies of North American Bees 7 



Nomada (Nomada) parva Robertson. 



A pair from Southern Pines, North CaroHna, April 12, 1910 

 (A. H. Manee) seem referable to N. parva in general characters 

 and size, but the abdominal spotting is confined to small but dis- 

 tinct spots on the sides of tergite 2. The $ (*'D") agrees per- 

 fectly with Cockerell's description of N. infaiitiila except for the 

 two abdominal spots and the reduction of the median propodeal 

 band to a spot on the enclosure. The J*, however, has the an- 

 tennae as in parva (^, joint 4 being longer than 3 or 5 but much 

 shorter than 13, with joints 4-7 not sublobate at apex beneath, 

 while in infantula ^ joint 4 is not only conspicuously longer than 

 3 or 5 but subequal to 13 and joints 4-7 are sublobate at apex 

 beneath, much as in sayi J*. Also the clypeal and lateral face 

 marks are yellow like the labrum, mandibles and front of scape, 

 not ferruginous as in infantula J*. Evidently parva and infantula 

 are separable chiefly in the J^ sex. A female from Hamilton 

 county, Kansas, 3,350 feet (No. 367, F. H. Snow) is also refer- 

 able to N. parva, but, like the North Carolina 5, has yellow spots 

 on tergite 2 only. A'^. miniita Swenk is definitely separable from 

 the forms of parva by the distinctly longer third antennal joint ; 

 joint 3 is two-thirds as long as 4 and one-half as long as 12, the 

 proportion being 3 : 4.5 : 6, while in parva joint 3 is only one-half 

 as long as 4 or less and not over five-twelfths as long as 12, 

 usually about one-third as long, the proportions in three 5 being : 

 2.5:5:6 (IlHnois), 2:5:6 (Kansas) and 2:4.5:6 (North Caro- 

 lina). It is also paler red, with less black color, than N. parva, 

 and has the hair on the inner side of hind basitarsi blackish 

 instead of pale and no yellowish color on the lower corners of 

 the face. 



Nomada (Nomada) cressonii Robertson. 



A female from Fargo, North Dakota, May 6, 1913, on Salix 

 (O. A. Stevens, 4392) is referred to cressonii. It is much like 

 the specimen from Manhattan, Kansas, mentioned in my paper 

 (p. 44), having a broad yellow band on tergite 5, but the black 

 on the propodeum is reduced to a narrow median line, while the 

 black mesoscutal line and ocellar spot are more reduced, thus 



161 



