48 Myron Harmon Szvenk 



flowers, viz., Primus americana, P. demissa, P. cerasus, Fragaria 

 virginiana, Salix nigra and cultivated Spiraea. In Sioux 

 county A^. illinoiensis flies in June (12-18) at flowers of Rosa 

 arkansana, Malvastrum cocinneum and Lappnla heterosperma. 

 This Sioux county series of five males differs from eastern Ne- 

 braska specimens in somewhat larger size, more blackish on the 

 legs and usually darker scape, but as these are somewhat variable 

 characters and as the series is apparently structurally identical 

 with the eastern series it seems best to refer them to N. 

 illinoiensis, for the present at least. 



Nomada (Nomada) pallidipicta n. sp. 



J'. Length 6-7 mm. Black, with the clypeus, lateral face marks extend- 

 ing narrowly up to level of antennae, line under eye, broad base of man- 

 dibles, labrum, scape in front, linear spots on sides of collar, a spot on 

 each lobe of mesoscutellum (edged with reddish or sometimes reduced 

 to tiny reddish spots) and abdominal maculations, cream-color or very 

 pale yellowish. Flagellum obfuscated above, deepening to black on the 

 four basal joints, brownish red beneath, ant^nnal joint 3 about one-half 

 as long as 4. Head and thorax coarsely and very densely punctured, 

 abdomen very finely punctured. Tubercles more or less reddish basally, 

 sometimes wholly reddish, but usually broadly edged with pale yellowish 

 on lower and posterior margins, and beneath each tubercle an oval meso- 

 pleural spot of variable size, cream-color more or less edged with red- 

 dish. Tegulae red. Wings hyaline, broadly infuscated on apical margin, 

 stigma pale brown, nervures dark brown. Basal nervure very slightly 

 basad of transverso-medial. Legs dark brown and black, the latter color 

 involving most of the anterior coxae and all of the other four coxae, 

 stripes on posterior face of anterior and middle trochanters, femora and 

 tibiae, two stripes on posterior trochanters, posterior femora except 

 apices and a stripe above, posterior tibae except knees and apex, and 

 posterior basitarsi. Outer face of posterior tibiae coarsely tuberculate, 

 inner face of posterior basitarsi densely pale golden haired. Abdominal 

 tergite i black, 2 with large subpyriform cream-colored spots laterally, 

 3 and 4 with narrow lateral bands of the same color, these sometimes 

 almost meeting, deeply emarginate submedially on apical margin, 5 with 

 a broad bilobed band and lateral spots nearly or quite cut off by deep 

 emarginations, 6 with a broad entire band, apex fusco-ferruginous, nar- 

 row, exceedingly feebly notched at tip or subentire. The lateral apical 

 margins of tergites 3 and 4 and the entire apical margins of 5 and 6 are 

 testaceous. Ventrally the segments are brownish, sternite i with a broad 

 subcordate black mark, 3 and 4 and sometimes 2 and 5 with cream- 

 colored bands, 6 with a creamy spot. A thin whitish or silvery pubes- 



48 



