Studies of North American Bees 109 



shilling, with coarse and close I)ut mostly quite separate punctures, sub- 

 cancellate only at places. Legs entirely red, not varied with yellow or 

 dusky. Wings fuliginous, darker apically, a clear spot beyond third sub- 

 marginal cell, nervures black, stigma pale red. Abdomen shining black 

 above, closely but not strongly punctured, tergites 1-5 with uninterrupted 

 yellow bands, narrow on i, broad and sharply notched in middle of ante- 

 rior margin on 2, much narrowed medially on 3 and 4, covering rhost of 

 tcrgite 5. Venter black, the first three sternites stained with red on apical 

 margins but no pale lines on any of them. 



c?. Length 7 mm. Very similar to the $, but whole of face nearly up 

 to level of antennae medially and nearly up to vertex laterally, bright 

 yellow, including the labrum and mandibles except tips ; line on posterior 

 orbits reduced to an oval spot behind summit of eye and narrowly con- 

 nected over eye with lateral face marks ; spot on mesopleura longer and 

 larger ; band on tergite 5 narrower, 6 with lateral spots, tergites 2-5 with 

 broad shining smooth dark margins apically; venter wholly black; apex 

 bifid. 



Type. — Halsey, Nebraska, July 11, 1909, on Amorpha canes- 

 cens (M. H. Swenk), $. 



Allotype.— Type lot, J*. 



This species resembles A^. arenicola, just described, but differs 

 in much smaller size, smaller and sparser punctures on meso- 

 scutum, red flagellum, supraclypeal spot, and other minor char- 

 acters. From N . crassula Ckll., the male differs at once in the 

 exceedingly less coarse and close puncturation of the mesoscutum 

 and the presence of a supraclypeal spot. From A^ tcxana 

 Cresson and its race A'', t. crucis Ckll., it may be distinguished by 

 the broader band on the second abdominal tergite, the lack of 

 ventral vittae and the less densely punctured mesoscutum. The 

 closer mesoscutal puncturation and yellow maculations separate 

 it at once from A^. z'ierecki Ckll. and A^. v. convolvuli and their 

 allies. It resembles A^. ncome.vicana Ckll. in some respects but 

 differs in smaller size, finer and more separated mesoscutal punc- 

 tures, lack of ventral lines, darker wings, wholly yellow labrum, 

 broader band on tergite 2, and the deeply notched apex of the 

 male. From .¥. tiftoncnsis Ckll., the contiguous lateral face 

 marks and orbits and the wholly red hind femora are diagnostic. 



Nomada (Micronomada) vierecki convolvuli n. subsp. 

 $. Length 7.5-8 mm. Black, with two large suboval lateral face marks, 



109 



