188 AMERICAN HYMENOPTERA. 



world (Popocatapetl and Orizaba excepted) these records 

 would be above the snow line and so pass the limits of 

 bumble-bee habitation. 



In the New World and in Asia also Bombus ranges from 

 the Equator (2° North Latitude in Asia, if Sumatra is not in- 

 cluded) to well within the Arctic Circle. The farthest north 

 records of capture are the following : B. kirbyellus Curt, 

 from Port Foulke (78i° North Latitude) 2in6. B. polaris Curt, 

 from McCormick Bay (77° North Latitude), Greenland. 



In South America, B. dahlbomii Guer. reaches the Straits 

 of Magellan and is abundant there. It will probably also be 

 found in Tierra del Fuego. No other species, however, ap- 

 pears to be present so far south. The next most southern 

 species, B. emilicB Dalla Torre, has, as yet, not been recorded 

 south of Juarez, Argentina (about 38° South Latitude), 

 though, as it has been reported as very abundant at Tandil, 

 only about eighty miles northeast of Jaurez, it probably 

 ranges to a considerable distance south of that place. How- 

 ever, our records, as a whole, indicate a paucity of species 

 of Bombus in the southern part of this continent as no species, 

 besides dahlbomii and emilics, has been reported south of 

 Buenos Aires. 



The New World species of Bombus and Psithyrus, as they 

 occur in the various political divisions, are listed below. 

 Gaps in the known habitat have, in this list, been filled in, 

 as far as they reasonably could be, according to the author's 

 judgment of the unknown habitat based on the known. The 

 known habitat of each species is given after the specific de- 

 scription. Extensive collecting will doubtless, in many cases, 

 extend considerably the geographical range as at present 

 known or conjectured. Hence this listing must be looked 

 upon as only approximately correct. However, it is prob- 

 ably accurate enough to give a pretty good idea of the gen- 

 eral distribution of the two genera and of their various groups 

 and to indicate, in some measure, what have been the main 

 factors in influencing this distribution. 



