52 Myron Harmon Szvenk 



abdomen. The male elsewhere referred to A'', taraxacella was 

 taken on the same day and in the same locality as the type of 

 septentrionalis, but can scarcely belong with it because of the 

 great discrepancy in the proportions of the third and fourth 

 antennal joints. 



Nomada (Nomada) simplex Robertson. 



1897. Nomada bella Robertson (nee Cresson), Trans. Acad. Sci. St. 

 Louis, VII, p. 340, ?. 



1902. Nomada simplex Robertson, Ent. News, XIII, p. 80, c?. 



1903. Nomada simplex Robertson, Can. Ent., XXXV, pp. 178-79, $ c?. 



A well-marked color variety of this species from Agricultural 

 College, Michigan, collected April 28, 1890, by R. H. Wolcott, 

 is before me. The lower half only of the clypeus is yellow, the 

 fasciae on abdominal tergites 1-5 are all interrupted medially, 

 rather broadly so on 1-3, the anterior and middle femora are 

 largely black in front and the apex is wholly dark. Probably 

 more material will show that this variation is correlated with a 

 more northerly distribution, as compared with typical simplex 

 from southern Illinois. 



Nomada (Nomada) wyomingensis n. sp. 



?. Lengtb 6 mm. Red, the tips of the mandibles, a black spot between 

 antennae at point of insertion which extends narrowly down sides of 

 supraclypeus and half way down the clypeal suture, line between ocelli, 

 cheeks behind, depressions of propleura, most of sternum, ventral plate 

 of metapleura, a median line on mesoscutum which expands at each end, 

 depressed portion of sides of mesoscutellum, metanotum except a central 

 line, spot on propodeum involving the lower half of the enclosure, and 

 spots on the coxae behind, black, while vague lines on the upper and lower 

 margins of posterior femora and an area at base of abdomen above are 

 suffused with blackish. Antennae wholly red except for a dusky suffu- 

 sion on front of joint 2, joint 3 four-fifths as long as 4. Clypeus strongly 

 punctured, the punctures running into striae marginally, the vertex 

 and thorax coarsely and closely punctured. Outer margin of hind tibiae 

 tuberculate, the apex of hind tibiae with only a few exceedingly small 

 and inconspicuous bristles, as in rhodosomcUa. Hind basitarsi with 

 black hair within. Abdomen dark brownish red, unspotted, tergite I 

 impunctate, 2-5 basally minutely indistinctly punctured with their apical 

 margins broadly smooth and impunctate. Wings hyaline, apically dis- 

 tinctly darkened, nervures blackish, stigma dark brown. Basal nervure 



52 



