Studies of North American Bees ' 27 



15, 1910 (A. H. Manee), present interesting variations. Both 

 have the red color of the abdomen reduced to mere reddish stains 

 along the apical margins of tergites 1-4 and the apical middle of 

 I ; the bands on tergites i and 2 narrowly interrupted, those on 

 3-6 complete ; the hind femora are arcuate and mostly black as in 

 articulata; the collar is yellow, the tubercles and tegulae red in 

 one specimen and yellow in the other ; the meaoscutum is black ; 

 the mesoscutellum and metanotum black in one specimen and 

 with four and two yellow spots in the other. Possibly they may 

 represent the males of a distinct but closely related species. 



Nomada (Nomadula) scita Cresson. 



In 191 3 and 1914 L. M. Gates collected a series of four females 

 and two males of this species at Mitchell, Nebraska. The speci- 

 mens were taken June 9, 10, 11, 17, 19 and 21 at flowers of 

 Aster and Malvastrum coccineum. 



Nomada (Micronomada) modesta Cresson. 

 Nomada (Micronomada) modesta vegana Cockerell. 



Additional material seems to indicate that there is but little 

 geographic correlation in the occurence of these two forms, and 

 that vegana is more probably a mere color variety of modesta 

 than a western geographical race. A pair of typical modesta 

 was collected at Imperial, in extreme western Nebraska, June 22, 

 1913, on Helianthus petiolaris (R. W. Dawson). However, 

 fifteen males from Mitchell, extreme western Nebraska, June 

 24-August 2, from Helianthus petiolaris and alfalfa blossoms 

 ('L. M. Gates), run uniformly small, as vegana J*, and a large 

 male from Louisville, extreme eastern Nebraska, July 30, 1914 

 (E. G. Anderson), seems to be modesta. From Trego county, 

 west central Kansas, July 12, 1912 (F. X. Williams), come two 

 typical modesta females and two males, one the size of modesta 

 and the other the size of vegana. From Ness county, July 7, 

 1912, just south, from Norton county, August 24, 1912, directly 

 north, and from Pratt county, June 27, 191 1, to the southeast, of 

 Trego county, come females typical of vegana (all F. X. Wil- 

 liams, coll.). Males from Decatur county (F. X. Wilhams) and 



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