586 PROCEEDINGS OF THE ACADEMY OF [-^Ug., 



differs by being smaller, the basal nervure very little basad of the trans- 

 verse medial, scutellum much less bilobate, mesothorax with only very 

 short inconspicuous hair, outer side of third submarginal cell curved 

 instead of angled, labial palpi pale ferruginous (darker, first joint 

 almost l^lack, in superba), etc. The A'^. superha compared is from 

 S. Illinois (Robertso}i) . The hump-like process seen on the sides of the 

 metathorax in superba is barely indicated bj' a slight angularity in the 

 Pecos insect. The length of the latter is about IH mm., and it is not 

 so broad as superba. In Robertson's table of Holonomada the Pecos 

 insect runs to affabUis and vincta, having the mesonotum coarsely 

 punctured, nearly bare, flagcllum red, its apical portion more or less 

 suffused with blackish. 



On the whole, I expect the Pecos bee to prove distinct from N. xan- 

 thophila, but as the two are so very much alike, and are known onh- 

 by single examples of opposite sexes, I leave the female as a variety' 

 pecosensis. 

 Nomada succincta, Panz. 



This is a Xanthidiurn, and looks much like our A^. sulphnrata. My 

 examjDles are from Palma de Mallorca, Balearic Is. (Andre). 



Nomada citrina, Cress. 



I have l^efore me three females from the Acad. Nat. Sciences Phila. 

 One is from Washington State, without further data; the others are 

 from Grangeville, Ida., "deposited by Wm. J. Fox." The Washington 

 specimen is no doubt genuine citrina. The Idaho form has the face 

 slightly narrower, and in one of them the head and thorax are red with 

 yellow markings, the black being reduced to a few spots and patches. 

 In this state the insect looks much like A^. morrisoni or zebrata. In 

 the Washington specimen the basal nervure meets the transverse 

 medial; in the Idaho ones the l^asal is a trifle more basad. In Cres- 

 son's types (as I learn from Mr. Viereck) the basal nervure is from 

 moderately to considera]:)ly basad of the transverse medial. 



The red form from Idaho may be called A'', citrina var. rufida. It 

 has the antennae entirely red, except that the scape is yellow in front; 

 the front and vertex are bright red, except that the ocelli are on a 

 black patch; mesothorax red, coarsely punctured, a little yellow in 

 front of the tegulae; scutellum with two large yellow spots separated 

 by red; abdomen yellow with red bands, basal half of first segment 

 red with four black or blackish spots; legs red and yellow, hind coxse 

 and femora heavily marked behind with black. 

 Nomada morrisoni, Cress. 



Three females from the National Museum are from Colorado; two 

 collected bv Morrison, one marked "San Louis, Col., June 6, 1883. 



