4 Myron Harmon Swenk 



proposed as a genus for its type species, Anthidium dorsale 

 Lepeletier, for while it agrees with Dianthidium in the possession 

 of pulvilli (though smaller than typical), it almost always has the 

 venation of Anthidium, the second recurrent nervure being usually 

 received opposite the second transverse cubital nervure instead of 

 well beyond it as in typical Dianthidium. Later, Cockerell re- 

 ferred A. occidentale Cresson and A. zebratum Cresson to Heter- 

 anthidium {ibid., XX, p. 261), and still later A. chippewaense 

 Graenicher {Proceedings U. S. National Museum, XXXIX, p. 

 643) was also referred to it. A critical examination of fifty-eight 

 specimens of zebratum from Nebraska and South Dakota shows 

 that while the great majority have the second recurrent nervure 

 perfectly opposite the second transverse cubital nervure, an occa- 

 sional specimen has it slightly but distinctly beyond that nervure, 

 practically as far as in some species referred to Dianthidium. 

 Hence the writer would for the present consider Heter anthidium 

 as a subgenus of Dianthidium, owing to the insufficiency of the 

 venation characters as a generic criterion, though there seem to 

 be differences in the palpi and dentition of the mandibles which, 

 if constant, may make it ultimately desirable to recognize Hetcr- 

 anthidium as a distinct genus. 



Anthidielhim Ckll. {Bulletin of the Southern California Acad- 

 emy of Sciences, III, p. 3) is a well defined group of species of 

 the general appearance of the type species, the European D. strig- 

 atum (Panzer), and deserves recognition as a subgenus, as pro- 

 posed by Cockerell. 



Family STELIDIDAE 



KEY TO THE NEBRASKA SUBFAMILIES 



Scopa absent in both sexes; maxillary palpi one or two jointed, short, 

 bare; mandibles 3-dentate; ornamentation usually whitish. . .Stelidinae 

 Scopa present in female; maxillary palpi two or three jointed, joint 2 long 

 and hairy; mandibles 2-7-dentate; ornamentation yellow or red. 



Anthidiinae 

 Subfamily Stelidinae 

 The genus Stelis is the only Nebraska representative of this 

 subfamily, but the genus is represented within our limits by at 

 least two groups or subgenera. 



