THEODORE H. FRISOJsT 313 



black-haired beyond the second segment," as well as statements 

 relative to the length of the malar space, all strengthen my 

 supposition that Cockerell's Michigan record is to be referred 

 to B. perplexus. B. perplexus is very common in the northern 

 parts of Michigan and, strange to say, is not recorded by Cock- 

 erell along with the other bumblebees common to that general 

 region. Varieties of rufocinctus Cresson occasionally approach 

 vagans and perplexus in coloration, but the extremely short 

 malar space, the tendency of the hypopygium to be carinate and 

 the position of the ocelli are all characters which serve to dis- 

 tinguish rufocinctus under such conditions. Cockerell mentions 

 that the malar space of his specimen is longer than that of 

 affinis Cresson, which indicates that it is not rufocinctus. The 

 hypopygium of pleuralis likewise has a pronounced carina, a 

 character not mentioned by Cockerell as possessed by his 

 Michigan specimen. 



According to Mr. Oslar, the bumblebees labelled "Patagonia 

 Mountains, Arizona," were found feeding on the blossoms 

 of wild blackberry and mesquite at altitudes from 5,500 to 

 6,000 feet. The presence of members of the Kirhyellus Group 

 in Arizona, as recorded above, gives that state representa- 

 tives of all the known American Groups of Bremus and one of 

 the three American Groups of Psithyrus. This state has there- 

 fore a varied bumblebee fauna, which is correlated with the 

 diverse ecological conditions existing in various parts of the 

 state. Because of the occurrence of so many species of true 

 bumblebees, other species of the genus Psithyrus besides craiv- 

 fordi Franklin will undou]>tcdly l)e found there. 



B. The Description of the Worker and Male of Bremus 



FRANKLINI FrISON, AND THE CoRRECT SyNONYMY OF 



Psithyrus kodiakensis Ashmead 



Bremus franklini Prison 



This species was originally described in the Entomological 

 News for 1921, from two specimens of the (jueens, both collected 

 at Nogales, Arizona. Since then, I hav'e had the opportunity of 

 studying specimens belonging to the United States National 

 Museum which I consider to ])e th(> other castes of this species. 



TRANS. AM. ENT. SOC, XLVIII. 



