6 Myron Harmon Szvenk 



between insertion of antennae which extends down along sides of supra- 

 clypeus into upper clypeal sutures, oval spot including ocelli, posterior face 

 of cheeks, median band on mesoscutum, depressed areas at sides of meso- 

 scutellum and metanotum, median band on propodeum which widens below, 

 propleura, mesopleural sutures and some of contiguous areas especially 

 above, metapleura and most of lateral aspect of propodeum, black. Man- 

 dibles peculiar, being short, broad and red, with their apices broadly obtuse 

 or subtruncate. Antennae red, joint 3 three- fourths as long as 4. Legs 

 red, coxae and trochanters behind, femora basally and beneath and a line 

 on posterior tibiae behind and outer face of hind basitarsi, blackish. Pos- 

 terior tibiae with the outer face finely tuberculate, the apex with a long 

 dark seta. Tubercles and tegulae red. Mesoscutellum slightly bigibbose. 

 Wings rather heavily darkened in marginal cell and at tip, the nervures 

 and stigma blackish, basal nervure much before transverso-medial nervure. 

 Abdomen clear red, minutely and feebly punctured, the basal one-third of 

 tergite i black right across, tergite 2 with small lateral yellow spots, apical 

 margin of 5 with a narrow dense white fringe. Pubescence very sparse, 

 all white, most noticeable on labrum, cheeks, lower mesopleura and lower 

 angles of propodeum. 



Type. — Fargo, North Dakota, June 20, 1913, on Brassica 

 campestris (No. 51 14, O. A. Stevens), $. 



Paratype. — Type lot (No. 51 13), $. 



Evidently a member of the sayi group, and especially close to 

 N. zisiae, just described, but easily distinguished by its peculiar 

 mandibles, slightly longer third antennal joint, less yellow on 

 abdomen, generally paler red color with lack of infuscation on 

 the apices of the tergites, etc. 



Nomada (Nomada) illinoiensis Robertson. 



A 5 from Duluth, Minnesota, July 9, 1914 (No. 7023 O. A. 

 Stevens; Nevada S. Evans, coll.), seems clearly referable to N. 

 illinoiensis, but exemplifies a slight color variation. Tergites 2 

 and 3 have small, round, lateral, yellow spots (in Nebraska 

 illinoiensis the spot on tergite 2 is large and subpyriform, that on 

 3 rather large and oval), tergite 4 has minute yellow lateral 

 spots, and tergite 5 has separated, round spots. The abdomin?l 

 markings thus resemble those of typical N. parva Rob., but this 

 specimen is 7 mm. long, much too large for parva. 



160 



