Studies of North American Bees 25 



verse cubital nervure, rarely a little beyond it; maxillary palpi 3-jointed; 

 mandibles 2-dentate; large species with complete abdominal bands. 



Heteranthidium 

 (Type D. dorsale Lepeletier) 



Subgenus Dianthidium Cockerell, 1900 



KEY TO THE NEBRASKA SPECIES 



Females 

 Abdominal tergites 1-6 with yellow bands, widely interrupted on tergite i, 

 less widely interrupted on 2, narrowly interrupted on 3 and 4, hardly 

 interrupted on 5 and complete on 6, none of the bands emarginate later- 

 ally; antero-lateral angles of mesoscutum with L-shaped yellow marks, 

 which extend back over tegulae ; mesoscutellum with two yellow lines ; 



9 mm jugatorium 



Abdominal tergites 1-5 with yellow bands, complete or nearly so on tergite 

 I, narrowly interrupted on 2-5, and more or less emarginate on 

 the posterior margin of the bands, at least on tergites 2 and 3, 



6 usually with two yellow spots i 



I. Legs red, sufifused with blackish on coxae, trochanters and bases of 

 femora; upper end of lateral face marks, sometimes sides of 

 clypeus, a transverse line on vertex extending down upper cheeks 

 behind summits of eyes, L-shaped marks on antero-lateral angles 

 of mesoscutum which extend back over tegulae, tegulae, tubercles, 

 mesoscutellum except extreme base medially, and apical and some- 

 times median suffusions on the basal abdominal tergites, red or 



reddish ; 9-10 mm sayi 



I. Legs black, with stripes on first four femora beneath and outer 

 faces of all of the tibiae and basitarsi or at least stripes on them, 

 pale yellow; sides of clypeus, lateral face marks, often supra- 

 clypeal, median vertical and postocellar spots, stripes behind eyes, 

 two spots on anterior margin of mesoscutum, tubercles, tegulae 

 exteriorly, and four spots on the mesoscutellum, pale yellow; no 

 reddish suffusions on the basal abdominal tergites; 8 mm. . .ulkei 



Males 



Posterior coxae simple ; pygidium black, obtusely conical with hyaline lat- 

 eral basal teeth; abdominal tergites 1-6 with broad yellow bands, re- 

 duced to lateral spots on i, very broadly interrupted on 2, gradually less 

 interrupted on 3 to 5, complete on 6, none of the bands at all emarginate; 

 legs yellow and black; a short line behind each eye, L-shaped yellow 

 marks on the antero-lateral angles of mesoscutum, and two lines on 

 mesoscutellum, yellow ; 9 mm jugatorium 



25 ■ 



