598 PROCEEDINGS OF THE ACADEMY OF [Aug., 



Phila. is referred to castonensis, but is peculiar for having the nervure 

 between the second and third submarginal cells wanting. 

 Nomada rhodomelas, sp. n. 



6^. — Length about 8 mm.; head and thorax black, extremely closely 

 punctured ; facial quadrangle nearly square ; anterior margin of clypeus 

 (failing in middle), labrum, base of mandibles, and very narrow lateral 

 face-marks ending as a fine line scarcely as high as antenniE, all yellow ; 

 scape black; flagellum red, basal half black above; third antennal 

 joint nearly as long as fourth; thorax entirely black except that the 

 tubercles are coppery-red; pubescence of head and thorax abundant, 

 dull Avhite, about the same color throughout; legs red, basal half of 

 anterior femora beneath, middle femora behind except apex, and hind 

 femora at sides and beneath, black; tegulae light ferruginous, shining; 

 wings fairly clear, dusky at apex; nervures and stigma dark brown; 

 second submarginal cell narrow, higher than broad; third about or 

 nearly as broad above as second, but greatly broadened at base; basal 

 nervure a fair distance basad of transverso-medial ; abdomen narrow, 

 light red; basal half of first segment black; hind margins of first and 

 second segments narrowly blackened, especially at sides; second and 

 third segments each with a pair of large light yellow spots, wide apart 

 and not pointed mesad; apex with a shallow emargination ; venter 

 red, more or less clouded with blackish, and black at base. 



Hah. — Corvallis, Ore., May 20, 1899 (Cordley). A female from Cor- 

 vallis, April 15 {Cordley), is referred to A'", rhodomelas with much hesita- 

 tion. It is red, and agrees with rhodomelas, and differs from grayi, in 

 having much black at the base of the first abdominal segment. The 

 second submarginal cell is very different from that of rhodomelas, being 

 greatly broadened at the base, not essentially different from that of 

 grayi. The abdomen is oval, quite broad, with round yellow* spots on 

 the sides of the second segment. The region just above the antennie 

 is black. 

 Nomada washingtoni, sp. n. 



9 . — T>ength about 8^V mm. ; a bright ferruginous species, super- 

 ficially similar to grayi, l^ut M'itli a shorter, more shining al^domen. It 

 differs also by its considerably broader face, the orbits hardly converg- 

 ing below, and the peculiar third submarginal cell, Avhich is high and 

 narrow, the outer side regularly curved. The wings are dusk}', the 

 stigma is dark, and the basal nervure is a long distance basad of the 

 transverso-medial; antennae wholly red, except that the scape has a 

 Ijlack mark above; third joint very much shorter than fourth; middle 

 of front with a large black patch; mesothorax with a median black 



