10 Proceedings of the Biological Society of Washington. 



Color. — Broad dorsal stripe extending from snout to base of tail clay 

 color 1 much mixed with blackish, decidely darker than sides and remainder 

 of upper parts which are clay color scantily mixed with coarse blackish 

 hairs ; ventral parts from chin to base of tail creamy white ; ears essentially 

 like dorsal stripe, narrowly edged with between pinkish buff and pale 

 pinkish buff; tail distinctly bicolor nearly to tip, between olive-brown 

 and chaetura drab above, whitish below, the terminal twenty millimeters 

 whitish both above and below. 



Skull. — About the size and proportions of that of Napaeozapus insignis 

 abietorum (as represented by specimens from Quebec); molar row longer 

 and heavier than in Napaeozapus insignis insignis and interorbital region 

 much more constricted (as in abietorum) ; postpalatal notch shallower than in 

 either N. i. insignis or N. i. abietorum, the anterior border about opposite the 

 middle or posterior half of last molar (in both insignis and abietorum the 

 anterior border of this is about opposite, or anterior to, anterior edge of 

 this tooth) ; palatal shelf greater in antero-posterior diameter than in either 

 insignis or abietorum. 



Measurements. — Type-specimen (adult male): Total length, 235; tail 

 vertebrae, 145; hind foot, 31. Skull: Type-specimen (adult male; teeth 

 slightly worn): Condylobasal length, 21.1; zygomatic breadth, 11.9; mas- 

 toidal breadth, 10.7; interorbital constriction, 4.5; posterior border of in- 

 cisors to anterior edge of mesopterygoid space, 9.1 ; anterior edge of mesop- 

 terygoid space to foramen magnum, 7.8; molar tooth row, 3.9. 



Remarks. — The Wisconsin representative of Napaeozapus is more clearly 

 defined in external characters from true i?isignis than either N. i. abietorum 

 or N. i. roanensis. Its pale dull colors, more clearly enunciated dorsal 

 stripe, and pale edges of the ears separate it at a glance from all other known 

 subspecies. The specimens were trapped in the same habitat with Zap-as 

 hudsonius hudsonius, usually grassy brushland or second growth (pre- 

 dominantly alder or paper birch, sometimes mixed timber of arbor vitae, 

 maple, aspen, and birch) along creeks. The type-specimen was trapped 

 in a grassy paper-birch thicket near the bank of Crescent Creek. 



Specimens examined. — Seven from the following localities in Wisconsin: 

 Crescent Lake, Oneida County, 1; Kelley Lake, Oconto County, 2; Lake- 

 wood, 3; Withee , JL. 



iRidgway, R., Color standards and color nomenclature, 1912. 



