Studies of .Worth American Bees 2i 



point fully one-seventh less than width at vertex ; mesoscutellum 

 black with two yellow spots ; abdominal bands on 2-4 anteriorly 

 constricted or interrupted medially; 5.5-7 mm salicicola 



12. Anterior orbits subparallel. the interorbital width at narrowest point 

 scarcely one-tenth less than width at vertex ; mesoscutellum 

 red ; abdominal bands all complete and not constricted on 



middle of anterior margin ; 7 mm parallela 



(The males of nigrofasciata, bisetosa, nlgrociliata, ochrohirta, velntina, 



aitgulata, and mintita are unknown or unrecognized.) 



Nomada (Nomada) adducta Cresson. 



1878. Xouiada adducta Cresson, Trans. Am. Ent. Soc, VIT, p. 73, 3- 

 1905. Xomada adducta Cockerell, Bull. 94, Colorado Exp. Sta., p. 

 74, c?. 



This species was described from a unique male specimen col- 

 lected in Colorado, and has not since been recognized from else- 

 where. In the vicinity of Lincoln, Nebraska, it is a not un- 

 common visitor at the flowers of H elianthiis annuus and Solidago 

 rigida, from latter August well into September. The writer has 

 before him a series of seven males and twelve females, and as 

 the latter sex is undescribed the following description of it is 

 appended : 



$. Length 8-9.5 mm. Dark red, the tips of the mandibles, area above 

 insertion of antennae, depressed portion of pronotum, prosternum, lower 

 metapleural plate and sometimes upper also, posterior coxae behind, 

 anterior and posterior mesoscutal sutures and sometimes more or less 

 of a discal spot which may be extended to form a feeble median band, 

 enclosure of propodeum, last four tarsi more or less and sometimes pos- 

 terior face of hind tibiae, black or blackish. Antennae red with the 

 flagcllum, especially above, more or less black or lilackish, joint 3 about 

 one and one-third times as long as 4. Body almost nude except for a 

 peculiar, appressed, silvery, sericeous pubescence which covers the propo- 

 deum except the enclosure, the sides of the apical abdominal segments 

 minutely and sparsely pale pubescent. Head finely and strongly punctured, 

 the mesoscutum and mesopleura with fine, shallow, crowded punctures 

 which cause the surface to have a distinct satiny sheen. Mesoscutellum 

 prominent but with only a faint medial depression. Wings hyaline, their 

 apical margins rather narrowly darkened, the nervures fuscous, stigma 

 brown, basal nervure interstitial with transverso-medial. Tiljial spurs 

 simple, reddish testaceous. Abdomen dark red, closely and strongly but 

 rather finely punctured, sometimes with a dusky suffusion above medially, 

 the apical margin of tergite 5 with a broad silvery tomentose fringe. 



21 



