30 Myron Harmon Szvenk 



the face, lack of red spots on mesopleura and propodeum, slender 

 scape, etc. N. jennei Ckll., and N. mimula Ckll., are not closely 

 related, having antennal joint 3 only about one-half as long as 4, 

 labrum pale, scape yellow in front, and many other differences. 

 From the texana-crucis-neonicxicana group, its closest allies, 

 simplicicoxa may be distinguished by the more finely punctured 

 mesoscutum and vertex, almost or completely broken mesopleural 

 band, broadly medially interrupted band on tergite 3, darker and 

 duller red legs with a yellow spot on anterior as well as posterior 

 end of hind tibiae, paler maculations and black labrum, as well 

 as by the lack of coxal spines. N. uhleri Ckll., (^ has coxal 

 spines, red mesopleural and metapleural spots, a large supra- 

 clypeal spot, red labrum, etc., very different from simplicicoxa; 

 while N. crassula J*, which resembles simplicicoxa J* in the face 

 marks, has long coxal spines, differently shaped band on tergite 2, 

 wholly black venter and several points of difference in the orna- 

 mentation. 



Nomada (Micronomada) arenicola Swenk. 



Two typical males are from Louisville, eastern Nebraska, July 

 28, 1914, on Silphiuni perfoUatum (E. G. Anderson), thus show- 

 ing the species to invade the range of A^. texana without modifica- 

 tion. It is undoubtedly a perfectly distinct species. 



Nomada (Micronomada) putnami Cresson. 



One female from Gove county, Kansas (F. X. Williams). 



Nomada (Micronomada) belfragei Cresson. 



A series of seven females and six males from western Kansas 

 (Clark county, May, F. H. Snow, i % 1 ^; do., June, 5 ?. 5 d"; 

 Gove county, F. X. Williams, i $) are referable to a sHght 

 variety of this species. The female agrees exactly with Cresson's 

 description of belfragei 5 except that the only black on the head 

 is a slight suffusion about the ocelli (in belfragei there is a black 

 Hne connecting the ocelli and tips of the mandibles), while the 

 pale thoracic markings are clear yellow (obscurely yellow in 

 belfragei). In both of these respects it agrees with belfragei 



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