HENRY J. FRANKLIN. 285 



Redescribed from numerous specimens of all sexes. 



Habitat. — I have records of this species from Newfound- 

 land, New Brunswick, Quebec, Ontario (Nepigon, Ottawa 

 and Lake of Bays), Manitoba and Alberta (Beaver Lake) in 

 Canada and from Maine, New Hampshire, Massachusetts, 

 New York (northern), Michigan, northern Wisconsin and 

 Minnesota (St. Paul and Lake Itasca) in the United States. 

 It is probably present in the old territory of Assiniboia and 

 in Vermont and northern North Dakota. In western Canada 

 its range seems to end on the eastern side of the Rocky 

 Mountains where it is completely replaced by its close ally, 

 B. appositus. What are its northern limits ? The type speci- 

 men came from Latitude 65 degrees. My most southern 

 record for it is Amherst, Massachusetts, where it is extremely 

 rare. I have no records from Pennsylvania, though I have 

 seen a large amount of material from that state. It is mainly 

 a Boreal form, but it runs over somewhat into the Transi- 

 tion Zone. In no part of its habitat does it appear to be a 

 very common species. 



This species has been confused with B. fervidus by many, 

 on account of its somewhat similar coloration, but it is not 

 even closely allied to that species. The females can be in- 

 stantly separated from those of fervidus by means of the 

 light pile on their faces and the males can be at once dis- 

 tinguished by their dark pleura. Specimens of this species 

 also generally have the yellow pile more tawny than does 

 fervidus. The females can be separated from those of its 

 close ally, appositus, by the difference in coloration of the 

 fifth dorsal abdominal segment, and the males from those of 

 appositus by the much whiter pile on the front of the thorax 

 in the latter species. 



Bonibus (Boinbus) appositus Cress. 

 .? Bontbus borealis Cresson, Proc. Davenp. Acad. Nat. Sci., I, 1876, p. 

 210. 

 " appositus Cresson, Proc. Acad. Nat. Sci. Phila., 1878, p. 

 183, 9 8 c?. 

 Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 

 230 (Catal.). 



TRANS. AM. ENT. SOC, XXX VIII. 



