312 MAMMALS. 



track seen by Wood near Turtle Bay on Sand Point, it was not noted 

 in the sand region. 



22. Mustela americana Turton. American martin. — Mr. Fittenger 

 trapped one of this species on Sand Point in the winter of 1855-6. 

 This was the only one that he had ever seen in the region. 



23. Putorius vison (Schreber). Mink. — The mink was not found 

 on Sand Point, but was observed at Caseville and on Stony Island, 

 being quite common in the latter place. 



24. Putorius noveboracensis Emmons. Northern weasel. — The 

 only weasel seen during the summer was on the south shore of Rush 

 Lake. On August 4, while standing on the bank of the county ditch 

 which empties into the lake at the southeast end, Ruthven saw a 

 specimen of this species run down a log on the opposite side of the 

 water, jump in, swim across, and disappear in the underbrush. After 

 leaving the field Mr. Austin Yax sent us a specimen which he trapped 

 at Rush Lake. 



25. Sorex personatus Geoffroy. Common shrew.- — A single speci- 

 men was taken in a cedar swamp at the east end of Rush Lake, on 

 August 19. 



26. Lasionycteris noctivagans (Le Conte). Silver black bat.— A 

 single specimen of this species was found under the bark of a Norway 

 pine stump (July 1) on Sand Point. 



