308 PROCEEDINGS OF THE ACADEMY OF [1897. 



Measurements. — (of type) Total length 175 ra. m. ; tail vertebraa 50 : 

 hindToot 23 ; ear, from crown 9. Average of 4 adults from Currituck : 

 total length 176 ; tail vertebra? 50 ; hind foot 23 ; ear 8. Average of 4 

 adults from Philadelphia County, Pennsylvania (type locality) : 

 total length 165 ; tail vertebrae 44 ; hind foot 21 ; ear 9. Skull (of 

 type): total length 29; greatest breadth 16.2; length of mandible 

 18. ' 



A very large series, comprising nearly 500 specimens of pennsyl- 

 vanicus from the eastern States and Canada, makes it possible to 

 define accurately the variations in M. pennsylvanicus. A study of 

 this material shows clearly a diminution in size and intensity of 

 coloration as we go northward from the southern border of its range. 

 Typical pennsylvanicus from Philadelphia County is exactly inter- 

 mediate between the large meadow mice of eastern North Carolina 

 and the -small ones of Quebec and the lower Hudson Bay regions. 

 The lightest colored eastern individuals come from the sea coasts of 

 New England and represent an imperfectly differentiated race ap- 

 proaching M. breweri, easily distinguishable from the darker animal 

 of the interior uplands of New England and the maritime coasts of 

 New Jersey. It is possible that the Albemarle Vole, like its asso- 

 ciates, Sorex fisheri and Blarina telmalestes, will be found to have 

 no connectant habitat with its northern representative, M. pennsylva- 

 nicus, but prove to be an insulated species. 5 So far as I can dis- 

 cover, the type locality of M. p. nirjrans is much farther south than 

 any previously recorded habitat of ]}ennsylvanicus on the Atlantic 

 seaboard. 



Thirteen specimens, nine adult, were preserved. They were all 

 taken at Currituck where they are abundant, being " obtained in 

 the ./uncus and grass of marshy fields as well as in marshy patches 

 of ground where mint and other weeds, on which they fed, were 

 abundant." 



4. Microtus pinetorum (LeC). Pine-woods Vole. 



A series of seventeen skins of this species from Currituck, which 

 we may consider nearly typical of LeConte's animal, when compared 

 with like series from more northern and mountainous localities in 

 Pennsylvania and New Jersey, do not indicate, either in color or 



5 A specimen of this race from near the York Eiver in Gloucester County, 

 Virginia, taken by Mr. Khoads since the above was written, indicates a con- 

 tinous distribution along the coast. 



