24 Myron Harmon Swcnk 



iioniada) frai/ilis Crcssoii. both in the proportion of the antennal 

 joints and in the yellow markings, and were at first referred to 

 that species. The coloration of the abdomen is very different 

 in the two species, however. It is really closely related to N. 

 modoconim Ckll.. bnt dift'ers in the shorter third antennal joint. 

 A''. siiban(/nsfa Ckll., from southern California, is also very close, 

 but compared with the type of that species in the U. S. National 

 Museum it may be separated at once by the shorter third antennal 

 joint, subaiigusta having it even longer than in modocorum, at 

 least two-thirds as long as the fourth. The supposed males of 

 A', rhodosoma Ckll. {Proc. Acad. Nat. Sci. Phil., 1903, p. 571) 

 are also related. 



Nomada (Nomada) nigrofasciata n. sp. 



$. Length 8 mm. Bright red, the tips of the mandibles, a line in the 

 depression of pronotum. a spot before tubercles, the mesopleural sutures, 

 the lower metapleural plate, depressed areas on extreme sides of meso- 

 scutcllum and metanotum, and distinct bands on apical margins of 

 abdominal tergites 1-4, black. Sides and lower corners of face, together 

 with labrum, usually yellow or more or less suffused with that color. 

 Joint 3 of antennae about one-half as long as 4 (proportion of 4.5:8.5), 

 viewed from above nearly as long as 4. Extreme sides of abdominal 

 sternites 3-5 sometimes with very small yellow spots, especially on 5, 

 and abdominal tergite 5 usually with a median yellow spot, all these 

 spots sometimes wanting. Pygidium narrowly rounded. Head and thorax 

 finely rugose punctate. Body practically devoid of pubescence, very thin 

 and short hair on cheeks, occiput and tip of abdomen, white, tinged with 

 ochreous on occiput and with tufts of curled blackish bristles at tip of 

 abdomen vent rally. Basal nervure much basad of transverso-medial. 



Tyl>c. — Bad Lands at mouth of Monroe canyon. Sioux county, 

 Nebraska. June 7, 1901. on Honialobns tcnclliis (M. Cary), $. 



Paratyf^cs. — Warbonnet canyon. Sioux county, Nebraska, June 

 3, 1901, on Syinf^horicarf>os occidcntalis (M. CaryV i $; do., 

 June 4. I $; do.. June 8, i $. 



This species is a member of the uigrocincta group. It is most 

 closely related to .V. packardicUa Ckll.. but differs in smaller size, 

 lack of a black median band on mesoscutum ami jiropodeum. lack 

 of black at base of abdomen and about antennal bases and ocelli, 

 femoral bases with little or no black, the band on apical margin 



24 



