Studies of North American Bees 47 



black right across and its apical margin black. Apex broad, deeply 

 notched. 



Type. — Warbonnet canyon, Sioux county, Nebraska, June 21, 

 1901 (M. A. Carriker), 5- 



Allotvpe. — Type locality, June 18, 190 1, on Rosa arkansana 

 (M. Gary), ^. 



Paratype. — Monroe canyon, Sioux county, Nebraska, June 18, 

 191 1, on Lappula hctcrosperma (R. W. Dawson), J*. 



Unquestionably this species is very closely related to A^". sayi 

 Rob., and might well be regarded as but a subspecies of that 

 insect Avere it not true that practically typical sayi itself extends 

 west into Colorado. The female differs from sayi in average 

 larger size, mainly black propodeum (mainly red in sayi) and 

 some other minor color characters, while the male is distinguished 

 chiefly by its larger size, extensively red mesoscutum and meso- 

 pleura and wholly red mesoscutellum. A^. mera Ckll., 5) as 

 represented by an autotype in the U. S. National Museum, is 

 closely related, and agrees in antennal structure, broadly bilobed 

 mesoscutellum, etc., but has long gray hair on the sides of the 

 propodeum, as in N. hilohata (very thin short pale hair in 

 propinqiia, confined to the angles), tergites 4 and 5 with yellow 

 discal spots (lacking in propinqua), etc.; the male mera is more 

 pubescent than the male propinqua, has more yellow on the face 

 (a supraclypeal spot and broader lateral marks), less red on 

 mesopleura, no yellow on anterior legs, etc. 



Nomada (Nomada) illinoiensis Robertson. 



1893. Nomada sayi Robertson, Trans. Am. Ent. Soc, XX, p. 276, $ c^ 



(part). 

 1900. Nomada illinoiensis Robertson, Can. Ent., XXXII, p. 294, ? c^. 

 1903. Nomada illinoiensis Robertson, ibid., XXXV, pp. 178-79, 5 (?• 



This species is found over the entire state, and next to A^. sayi, 

 is our commonest Nomada sens. str. Specimens in a series of 

 eleven females and twelve males studied are from Falls City, 

 Lincoln, West Point, Indianola, Warbonnet canyon and Monroe 

 canyon. Its season is practically the same as that oi N. sayi in 

 eastern Nebraska, April 18 to May 14, and it visits much the same 



47 



