8 University of Michigan 



Psithyrus laboriosus (Palnicius). 



Whitefish Toint, Chippewa Co., June 2/, one female (An- 

 drews 2). Fabricius bestowed the s])ecihc name, supposing 

 that he had a Bomlxis before liim ; it is scarcely appropriate 

 for a Psithyi'us. 



h-. Thorax aboz'c ivitli a black hand of Jiair. 



i\ I'crtcx wilJi a patch of ycUozv hair; pleura zvitli iniicli light 

 hair. 



Psithyrus insularis (Smith). 



Floodwood, Schoolcraft Co., July 6, 15, two females 

 (Gaige i, 22). Whitefish Point, Chippewa Co., July 24, one 

 male (Andrews 9). The male is much smaller than the female. 



i". J'crtex zvithouf a patch of ycUozu hair; only upper part of 

 pleura ~a'ith yelloz^' hair. 



Psithyrus ashtoni (Cresson). 



Floodwood, vSchoolcraft Co., July 6, 8, 15, three females 

 (Gaige 2, 6, 22). Whitefish Point, Chippewa Co., July 23, one 

 male (Andrews 10). 



g-. Hind tibcc li'ilh a smooth, shining, pollen-collecting surface 

 on outer side in queens and v^orkcrs, which alone are 

 represented in the coUcclion. 



h\ first abdominal segment with light hair. 



i^. A In ft of yellow hair near bases of anienncc; nmlar space 

 rather long; black band on thorax extremely broad; 

 yellozu hair of scutellum interrupted in the middle. 



