MAMMALS MARTINAE PUTORIUS FRENATUS. 



175 



General dimensions. Specimens in alcohol. 



This species is readily distinguishable from its American congeners, except P. xanthogenys, 

 by the singular patch of yellowish white on the forehead, and another anterior to each ear. It 

 is quite abundant about Matamoras and Brownsville, Texas, although it does not appear to 

 range further north, at least it has not been noticed in Texas except on the Rio Grande. Mr. 

 Clark procured a very fine specimen at Ringgold Barracks. 



A specimen from the city of Mexico agrees rather better with the description of Lichtenstein. 

 The head is black considerably behind the ears ; the under part almost pure white to the 

 middle of the belly, where a reddish tinge is visible. In size it is much less than Rio Grande 

 specimens, the feet not more than half as large as No. 200. 



The following are the measurements of the specimen described by Lichtenstein. 



Measurements. 



