1908.] NATURAL SCIENCES OF PHILADELPHIA. 407 



Putorius longicauda. 



This weasel invades the mountains also to some extent, as I have 

 observed it in Boulder Canyon several miles above its mouth. 

 Sorex personatus. 



The occurrence of this shrew in the Rocky Mountains as far 

 south as Colorado extends considerably southward in these mountains 

 the range of this northern and eastern form. Its presence in the 

 meadows about Boulder brings this Boreal species down to the edge of 

 the Upper Sonoran zone. 

 Sorex personatus haydeni. 



Warren^^ records a specimen of this shrew taken by him at Lake 

 Moraine and identified by Merriam. Inasmuch as haijdeni is a North 

 Dakota plains form its occurrence in the Hudsonian zone on Pike's 

 Peak is certainly interesting. Have we here a marked case of migra- 

 tion, a case of polygenesis, or is haijdeni, as Elliott^^ believes, a synonym 

 for personatusl 

 Sorex vagrans dobsoni. 



This is another interesting record given by Warren^^ and based on 

 an identification by Merriam. In iV. A. Fauna, No. 10, p. 68, the latter 

 gives the distribution of this shrew as parts of Idaho, Montana, Wyo- 

 ming and Utah. He says further in the same place: "The interrela- 

 tions of dobsoni and obscurus are intricate and perplexing. The two 

 animals resemble one another very closely, but no intergrades have 

 been found, and each has, so far as known, an independent distri- 

 bution." This record extends the range of dobsoni considerably 

 southward, making it coincident, at this point at least, with that of 

 obscurus. 

 Sorex obscuruB. 



Merriam^" gives the distribution of this species as "Restricted to 

 Boreal Zone." Specimens collected by me at Boulder extend its range 

 through the Transition zone. 



Corynorbinus maorotis pallescens. 



I have a specimen taken in Boulder Canyon at an approximate 

 altitude of 2,300 m., which shows an occasional invasion of the Transi- 

 tion zone by this supposedly Sonoran species. 



" Op. cit., p. 265. , , ... 



^^ Elliott D. G.: A Synopsis of the Mammals of North America and the Adja- 

 cent Seas, 'Field Columbian Museum, Zool. Ser., II, 1901, p. 367. 

 i» O-p. cit., p. 266. 

 ="> Op. cit., p. 72. 



