1911] Taylur: Mammals of the 1909 Nevada Expedition. 263 



color; namely there is a predominance of slate dorsally, which 

 blends posteriorly into the "normal" buffy^gray. This specimen 

 has also much more of a buffy tinge on the sides of the neck and 

 posteriorly than the other juvenals examined. An older juvenal 

 (no. 78G9) is apparently molting from the lighter juvenal pelage 

 into the darker adult pelage, as a distinct molt-line is evident 

 running transversely across the dorsal surface in the region of 

 the ears and another line, rather indistinct, running irregularly 

 across the ventral surface about half-way back. Anterior to 

 these molt-lines the buff pelage predominates. 



A number of adults, too, show definite molt-lines, which can 

 be followed on the back of the gopher but are often indistinguish- 

 able on the breast and belly. In general the molt proceeds more 

 rapidly on the back than on the sides. One example (no. 7859) 

 exhibits three distinct molt-lines, two of them in the middle of 

 the back about an inch apart, the other two inches anterior of 

 the tail. These observations seem to show that, whereas, generally 

 the hair starts to be renewed at the nose and the molting process 

 works backward toward the tail, in some cases there are two 



Table of External Measurements of Eleven Adult Specimens of 

 Thomomys nevadensis From Humboldt County, Nevada. 



J'or nipthod of taking measurements, see Introduction. 

 All dimensions are in millimeters. 



