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PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 40. 



Remarks. — Sciurus marinsularis needs comparison only with S. 

 polio-pus, described above. The two species may be more closely 

 related than the descriptions would indicate. The specimens repre- 

 senting the mainland species are evidently in not so fresh a pelage, 

 which might account, in part at least, for the striking difference in 

 color of the under parts of the two forms. The greater extension of 

 gray about the feet and legs of the mainland animal serves to distin- 

 guish them readily, and would not appear to be produced by wear. 

 It is unfortunate that no cranial or dental characters can be found to 

 separate the gray-footed squirrels from the buffy-footed forms. It 

 hardly seems probable that the difference in color of the feet and legs 

 can be dimorphic. Among the many squirrels of the vittatus group 

 collected by Doctor Abbott it has never been noticed before. The 

 only other gray-footed squirrels of this group in the U. S. National 

 Museum are specimens of the gray-bellied Sciurus notatus from Java. 

 All the other gray-bellied and "red "-bellied species have the feet in 

 general concolor with the upper parts, or often more buffy or ochra- 

 ceous in color. 



Measurements of squirrels of the vittatus group. 



1 Collector's measurements. 



a Measured by writer after feet had been relaxed by soaking in water 24 hours. 



8 Type. 



