SCIURUS AESTUANS. 103 



In our specimens the upper incisors are slightly grooved 

 and there are not tioo but a single upper premolar. Allen 

 states that it has two upper premolars, the first quite 

 large for a Sciurus and Alston ascribes to Sciurus rujo- 

 niger also two upper premolars. As I have personally 

 extracted the skulls out of the skins there can be no error 

 whatever in the above given results of my examination of 

 the skulls. In my opinion the differences between Sciurus 

 rufoniger Pucheran , Scinrus chrysuros Pucheran (chrysosurus 

 Alston) and Sciurus deppei Peters , are not important enough 

 to justify Alston's division into two species: I feel sure 

 that larger series will confirm that they belong to the same 

 species. 



The specific title rufoniger has been applied by Gray in 

 1843 to an Indian Squirrel (List of the specimens of Mam- 

 malia, etc., p. 142). 



Hab. Mexico; Guatemala; Honduras; Panama; New 

 Granada and Columbia. 



Mounted specimens in the Leyden Museum: 

 1. Adult male , Mexico , Vera-Cruz. — 2. Young speci- 

 men , Mexico , from the Paris Museum, — 3. Young speci- 

 men, New Granada, Medellin, Frank, 1872. — 4. Yery 

 young individual, Medellin, 1872. In N^s. 3 and 4 the 

 black dorsal band is very good developed. 



5. Skull of N". 1. ~ 6. Skull of N«. 3. — 7. Skull of 

 N». 4. 



Sciurus aestuans. 



1766. Sciurus aesttians Linnaeus. Systema naturae. T. I. 

 p. 88. NO. 9. 



1877. Sciurus aestuans, var. aestuans Allen. Mon. N.-Am. 

 Rodentia. p. 756 ; Sciurus aestuans , var. rufoniger 

 Allen, 1. c. p. 757 (partim). 



1878. Sciurus griseogenys Alston. P. Z. S. L. p. 667; 



Notes frora the Leyden IMuseuixi, "Vol. "V. 



