30 Myron Haiiiioii Swoik 



black on the femora and tibiae (red with only the basal joints 

 black in niidoscusis) ; the first abdominal tergite of aprilina has 

 a distinct nearly interrupted broad obscurely reddish band which 

 is barely indicated in rnidosmsis on close inspection in strong 

 light, and the bands on tergites 3-6 are less deeply emarginate 

 behind laterally in aprilina than in ruidoscnsis, but the first of 

 these is a variable character and ruidoscnsis sometimes has an 

 interrupted yellow band more or less developed on tergite i as 

 in pallidcUa, at least in some Colorado specimens, while the 

 mesoscutellum sometimes bears yellow spots (see Cockerell, 

 Bulletin of the American Museum of Natural History, XXII, 

 p. 438). It is separable at once from N. simplex Rob. and N, 

 salicis Rob. by the lack of clear yellow color on the legs ; it 

 further dififers from simplex by the deeply notched apex, spotted 

 and bilobed mesoscutellum and non-sinuate flagellum, while from 

 salicis it further differs by the longer median flagellar joints, 

 basal ncrvure basad of transverso-medial nervure. and smaller 

 mesopleural spot. From the somewhat similar but autumnal 

 N. vicina Cress., it dififers in the coarser puncturation of the 

 head and thorax, the deeply notched apex, red tegulae and lack 

 of yellow niaculations on the first abdominal tergite. 



Nomada (Nomada) bisetosa n. sp. 



$. Length 7 mm. Bright red, only the tips of the mandibles, internal 

 margins of ocelli nearly coalescing to form a line, extreme hind margins 

 of cheeks, spots in depressions of propleura and prosternum, sutures of 

 mesopleura, lower metapleiiral plate, spots on bases of coxae behind, 

 spots on middle femora at l)ase, lines on i)ostorior femora and tibiae 

 behind, part of depressed sides of mesoscutellum, and a tinv spot at 

 extreme apex of enclosure on propodeum, black. Antennae bright red, 

 joint 3 three-fourths as long as 4. Clypeus finely and rather weakly 

 punctured, the punctures not crowded l)ut separated about the widtii of 

 one. Vertex and mesoscutum coarsely and shallowly punctured. Legs 

 bright red, except for the spots already mentioned, the hair on hind 

 basitarsi within shining pale ochreous with many black hairs intermixed 

 along anterior margin, the apex of the hind tibiae with a remarkable pair 

 of large stout curved black setae, the last four tarsi with sparse long 

 black bristles, the hair of the legs otherwise white and very thin. Tibial 

 spurs pale, those on hind tibiae not obviously pectinate. Scape, cheeks, 

 n'lesonotum. ]iloura, sides of projjodcum and posterior coxae with very 



30 



