Occasional Papers of the Museum of Zoology 3 



in summer and cold in winter. iVIuch of the country consists 

 of open range hills, and on the levels a good deal of fruit farm- 

 ing is carried on with the aid of irrigation." Anderson Lake 

 and Mt. JMcLean are near Lillooet. All the Alberta material is 

 from Edmonton, in the south central part of the Province. 



In the study of our northern fauna species of holarctic dis- 

 tribution require especial attention because the facts of their 

 present occurrence may well furnish reliable clews to move- 

 ments now lost in the obscurity of the past. In connection with 

 the list of species common to New England and the Palaearctic 

 region, given in a former paper^, I called attention to the large 

 proportion of holarctic forms occurring in New England, as 

 compared with other regions of the continent, and remarked as 

 follows concerning the bearing of this observation on Hor- 

 vath's- view that such species have migrated hither from east- 

 ern Asia, "The latter opinion seems hardly in accord with the 

 apparent massing of the species on the eastern side of the con- 

 tinent, .... but . . . possibly the range [of these species] may 

 be found .... to extend westward when our knowledge of the 

 fauna of British America is more nearly complete." In the 

 collections now under consideration there are represented 19 

 species found also in the Palaearctic region, all of which find 

 place in the New England-Palaearctic list, except Aradus cin- 

 namomeus which occurs on Long Island, N. Y. ; together with 2 

 others, ,il/rco;;nna gilvipcs and IschnorrhyncJuis franciscanus, 

 so closely related to the palaearctic M. amhulans and /. rescdae 

 that very possibly they are in reality subspecies", differentiated 

 since the disappearance of some of the early conditions favor- 



1 Occas. Papers, 7, Boston Soc. Nat. Hist., Fauna N. E. 14, Hem. Het., 1917, 



pp. ~-9- 



- Rels. entre faunes hem. Eur. et Am., Ann. Mus. Hunganci, Vol. 6, 



1908, p. 7. 



'This possibility regarding M. gll-xpcs is suggested by Van Duzee, Rept. 

 Hem. Giffard, Proc. Cal. Acad. Sci., (4), Vol. 7, 191 7, P- 276. Concerning 7. 

 franciscanus see page 15 of the present paper. 



