28 Myro)i Harmon Sivcnk 



front, a band on abdominal tergite 2 which is broad laterally but con- 

 stricts medially and is narrowly medially interrupted, broadly interrupted 

 narrow bands on tergites 3 and 4 which are nearly concealed under the 

 apices of the preceding tergites, a similarly concealed but narrowly inter- 

 rupted band on tergite 5, a narrow but exposed and complete one on 6, 

 and a spot on sternite 6, bright yellow. Antennae above blackish, beneath 

 dark reddish brown, joint 3 about one-half as long as 4, joints 4-8 with a row 

 of feeble denticles along the outer side on the line of demarcation of the two 

 color shades of the antennae. A stain on sides of vertex, a postorbital 

 line, collar, mesoscutum except a median line, mesoscutellum and metano- 

 tum except on the depressed lateral portions, and a large spot involving 

 most of the mesopleura, red or reddish. Tubercles, tegulae and legs 

 coppery or reddish testaceous, the legs tinged with yellowish on anterior 

 knees and front face of tibiae, the coxae, trochanters and more or less 

 of the femora behind more or less suffused with blackish, the hind femora 

 all blackish behind except the knees. Face, labrum, cheeks, pleura, pectus 

 and coxae with abundant shining silvery hair, mesonotum and sides of 

 propodeum with thin pale hair, legs sparsely pale haired. Mesoscutellum 

 rather strongly but quite broadly bilobed. Abdomen, except the yellow 

 bands and a subterminal broad reddish band on tergite 2, mostly reddish 

 dusky or blackish owing to the deep infuscation of the apical margins of 

 the tergites. Apex red, strongly notched. Wings hyaline, the marginal 

 cell and broad apical margin darkened, nervures and stigma fuscous, 

 basal nervure basad of transverso-medial nervure. third submarginal cell 

 much narrowed above, only one-half as broad as the second. 



Type. — Bellevue, Sarpy county, Nebraska. June 10, 1906 (R. 

 H. Wolcott), c^. 



Obviously this species is very closely related to N. bilobata (^, 

 just described, but the distinctly larger size, much less acutely 

 bilobed mesoscutellum, longer and broader lateral face marks 

 with little black extending down in the sutures from the point of 

 insertion of antennae, darker and differently maculated abdomen, 

 etc., seem to present dift'erences of specific value. The two 

 apparently fly at the same season. 



Nomada (Nomada) aprilina n. sp. 



c?. Length 7 mm. Black with bright lemon yellow markings ; the 

 clypeus except a narrow margin on basal half, labrum, mandibles except 

 tips, line under eye, small triangular lateral face marks produced upwardly 

 in an orl>ital line nearly to the level of insertion of antennae, scape in 

 front, a tiny spot on lower anterior margin of mesopleura and abdominal 

 maculations, bright yellow. Antennae black above, the flagellum beneath 



28 



