MU'ROTUS. 87 



Arvicola longirostris Baird. 



Mammals of Xnrtli America, ]>. 5.S0, 1857. 

 =Microtus montanus (Peak-). See I'ailey, Xortli Anier. Fauna, No. 17, j). 27, 

 June t), 1900. 



jIIo- Mounted .skin and fnignientaiT skull. Adult female. Upper 

 Pitt Kiver, California. September, 1855. Collected by Dr. J. S. 

 Newberry. Catalognied Jatuiaiy, 1856. 



Mounted specimen in fair condition; a little hair gone from the right side. 

 Skull very fragmentary. Both halves of lower jaw complete. Upper teeth 

 loose, but all present from each side and in a separate glass tube. A few other 

 fragments are in another tube. 



Rainl had but one specimen, the above, which he designated by number. 



Microtus ludovicianus Bailey. Biological Survey collection. 



North Ami-r. Fauna, No. 17, pp. 74-75, June 6, 1900. 

 96621:. Skin and skull. Adult male. Iowa, Calcasieu Parish, Loui- 

 siana. April 7, 1899, Collected b}^ V. Bailey. Original niunber 

 6767. 



Well-made skin in good condition; skull perfect. 



Microtus macfarlani Merriam. 



Proc. Wash. Acad. Sci., II, p. 24, March 14, 1900. 

 sWiT- Skin and skull. Fort Anderson, north of Great Bear Lake, 

 Mackenzie, Canada. 1865. Collected by li. MacFarlane. Origi- 

 nal number 3179. Skin catalogued July, 1868; skull, March 31, 

 1898. 



Specimen remade into a modern study skin and the skull removed and cleaned 

 in March, 1898. The skin is well preserved and in good condition save for some 

 apparent lengthwi.se stretching. Skull perfect, except for loss of right malar 

 and a hole in left audital bulla. 



Arvicola (Mynomes) macropus Merriam. Biological Survey coll. 

 North Amer. Fauna, No. 5, pp. 59-61, pi. 2, figs. 7-8, July 30, 1891. 

 =Microtus richardsoni macropus (Merriam). See Bailey, North Amer. Fauna, 

 No. 17, p. 61, June 6, 1900. 



Ifl^T- Skin and skull. Adult female. Pah.simeroi Mountains, Idaho. 

 Septem})er 16, 1890. Collected by Dr. C. Hart Merriam and V. 

 Bailey. Original numl)er ]8()3. 



Well-made skin in good condition; skull perfect. 



Microtus macrurus Merriam. Biological Survey collection. 



Proc. Acad. Nat. Sci. Phila., p. .35.S, October 4, 1898. 

 66151. Skin and skull. Adult female. Lake Cushman, Olympic 

 Mountains, Washington. June 26, 189-1. Collected by C. P. 

 Streator. Original iuun))er 397.'). 



Well-made skin in good condition; skull jK'rfect, except for broken frontals and 

 right audital bulla. 



