Studies of North American Bees 31 



var. xanthogastcr Ckll., but the abdominal bands on tergites i 

 and 2 are broadly interrupted, or reduced to large ovate lateral 

 spots, that on i not including a red spot, while the venter is im- 

 maculate red, as in typical helfragei. This series is thus exactly 

 intermediate between typical belfragei and its variety xantho- 

 gastcr. 



The male of A^. belfragei has heretofore been unknown. It is 

 closest to A^. lamarcnsis Ckll. J*, but is quite distinct in the vena- 

 tion and coloration. It may be described as follows : 



^. Length 9.5-11 mm. Black; clypeus, mandibles except tips, labrum, 

 lateral face marks extending narrowly along orbits to summits of eyes, 

 collar, tubercles, lobes of mesoscutellum, line on metanotum, subtriangular 

 spot on mes6pleura and abdominal maculations, clear yellow ; spots on ver- 

 tex beyond end of lateral face marks, narrow postorbital line, sides of meso- 

 scutum or four bands on it, axillae, most of mesopleura (except the yellow 

 spot), legs except black coxal bases, and venter of abdomen, ferruginous. 

 x\ntennae orange to red. the fiagellum dusky above beyond third antenna! 

 joint which is subequal to the fourth. Anterior coxal spines a little longer 

 than in the ?. Tegulae large, punctured, yellowish testaceous. Second 

 submarginal cell subtriangular, much narrowed above, as in the ?. Ab- 

 dominal tergites 1-5 with yellow bands, on i and 2 more or less narrowly 

 margined and medially interrupted with reddish stains, that on 2 some- 

 times complete, i with the basal half of the tergite black, bands on 3-5 

 more or less emarginate on anterior margin by the encroachment of the 

 black basal color, deeply so on 3 so as to almost interrupt the band. Apex 

 black basally, reddish apically, distinctly but not deeply notched. 



Allotype. — Clark County, Kansas, 1962 feet, June ( F. H. 

 Snow), <$. 



Nomada (Micronomada) wheeleri Cockerell. 



A female from Clark county, Kansas, 1962 feet, June ( F. H. 

 Snow), agrees with typical ivheeleri except that there is no yellow 

 mesopleural spot, in this respect agreeing with the subspecies N. 

 zv. engehnanniae Ckll. However, it differs from N. zu. engel- 

 manniae in the yellow ornaments and maculations (cream-color 

 in engehnanniae) , the continuous red line bounding the anterior 

 orbits (broken in frontal region in engehnanniae), and the yellow 

 mesoscutellar lobes separated by a dark band (these connected 

 in engehnanniae). The mesoscutum has a rather narrow an- 



185 



