50 Myron Harmon Szvenk 



band on propodeum, base of abdomen above right across except for an 

 enclosed oval red spot, spots on extreme sides of tergites 2 and 3 and 

 complete but more or less concealed bands on extreme base of tergites 

 4 and 5, black. Antennae red, joint 3 slightly less than one-half as long 

 as 4. Lower orbits with a yellow line, becoming broad below. Wings 

 darkened, heavily so in a broad apical band which is immediately pre- 

 ceded by a clear spot, nervures fuscous, basal nervure slightly basad of 

 transver&o-medial. Abdomen red tinged with purplish, unspotted, the 

 apical margins of tergites 1-4 broadly smooth, shining, a burnished 

 bronze in strong light. Apex of tergite 5 with a short and very thin, 

 inconspicuous, pale tomentose band. Tibial spurs short, whitish, simple. 



Type. — Palo Alto, California, April 3, 1895 (Leland Stanford 

 University coll.), 5- 



Apparently this is the form based on a single female specimen 

 from Corvallis, Oregon, May 20, which Cockerell placed as a 

 variety of N. astori with the comment that it looked like a distinct 

 species. It certainly is closely allied to both A^ nitiiim and N. 

 astori, and its characters are more or less intermediate between 

 the two. From astori it differs in the slightly shorter third 

 antennal joint, trilineate mesosctttum, base of abdomen black 

 right across, slightly smaller size, etc. ; from ultima, with which 

 it agrees in antennal structure, it differs in the lack of yellow 

 lateral abdominal spots (spots on sides of 2-4 in ultima), the 

 base of the abdomen black right across or sometimes black enclos- 

 ing an oval median red spot (no black medially in ultima), the 

 sides of the tergites inclined to be black spotted and more or less 

 banded basally on 4 and 5, the anterior and middle femora with 

 black at base behind (entirely red in ultima) and the hind femora 

 mostly blackish behind. From A^. oregonica Cockerell, all three 

 of these forms differ in the decidedly shorter third antennal joint 

 and the peculiar purplish luster of the tergum. It is entirely 

 possible that with a large series at hand ultima, astori and mediana 

 will prove to intergrade sufficiently to be considered as but forms 

 of one species, but for the present they had best stand as distinct. 



Nomada (Nomada) ultimella septentrionalis n. subsp. 



?. Length 7 mm. Very similar to N. ultimella Cockerell, but the 

 propodeum with a distinct narrow black median band (this band only 

 barely indicated in ult'imeUa), the first abdominal tergite without blackish 



50 



