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9

peculiarities of dentition.

A series of skins of Ermines, showing the different colors of pelage was exhibited before the Biological Society of Washington in connection with a paper on changes in color of hair, read by Dr. D. W. Prentiss.

The Curator examined and identified the Museum collection of skins of [[underline]]Perognathus[[/underline]] in the light of a recent revision of the genus by Dr. C. H. Merriam, and had new labels prepared for the series. He also studied the characters of the new species and subspecies of North America[[strikethrough]]n[[/strikethrough]]