Studies of North American Bees 17 



females except that they are nearly 10 mm. long and possibly a 

 little darker red in color. These correspond a little better in 

 size with Cresson's type than the Nebraska specimens do, but I 

 think all are conspecific. 



Nomada (Holonomada) omahaensis n. sp. 



c^. Length 8 mm. Black; mandibles except tips, labrum, clypeus except 

 upper edge, lateral face marks filling space between clypeus and eyes and 

 abruptly continued along orbits to antenna! level thus making the appear- 

 ance of a rectangular internal emargination, line under and behind eyes, 

 scape in front, collar, tubercles, tegulae, crescentic mark behind tegulae, 

 spot on wing bases, mesoscutellum, two spots on metanotum, large an- 

 terior and small posterior spots on mesopleura, spots on mesosternal lobes 

 posteriorly, spots on coxae involving most of posterior pair, spots on distal 

 ends of femora and lines on first four femora behind, both ends of tibiae 

 connected by a line on anterior tibiae, basitarsi externally more or less, 

 and abdominal maculations, yellowish white or cream color. Labrum and 

 mandibles suffused with reddish. Antennae dark red beneath, blackish 

 above, joint 3 one-third longer than 4. Legs red, except for creamy spots 

 described, and the rest of the coxae and all or most of the trochanters, 

 stripes on femora behind sometimes involving most or all of the surface, 

 sometimes hind femora in front, and middle of hind tibiae and sometimes 

 also middle tibiae, at least externally, all of which are black or blackish. 

 Pubescence thin, all pale, white on cheeks, pleura and legs, gray on vertex 

 and mesoscutum. Puncturation of head and thorax fine and dense, minute 

 on abdomen, the mesoscutum subopaque. Wings clear basally, apical 

 margin clouded, stigma and costal nervure ferruginous, other nervures 

 blackish, basal nervure meeting transverso-medial. Mesoscutellum flat- 

 tish, only feebly bilobed. Abdomen black, tergites 1-6 with creamy bands, 

 that on I sometimes medially narrowly interrupted and always enclosing 

 round black spots laterally, the others complete but considerably narrowed 

 medially on 2 and 3. Venter black, sternites 2-5 with broad, complete 

 creamy bands. Apex black, entire. 



Type. — Omaha, Nebraska, August 29, 1914, on SoUdago cana- 

 densis (L. T. WilHams), (^. 



Paratype. — Type lot, i J*. 



Belongs to the snozvi group. Apparently it is very close to N. 

 mutans Ckll., from Washington, but is seemingly not the un- 

 known male of that species because of its larger size (mutans 2 

 is only 5.5-7 mm. long), subopaque mesoscutum, clearer wings 

 and several minor color differences. Related also to N. daco- 



171 



