SCIURUS. 105 



8 and 9. Young male and young females, Peruvian Ama- 

 zons, Hualaga, collected by Bartlett in 1867 and 1868. 

 N°. 8 received s. n. Sciurus irroratas , young. — 10. Young 

 male, Peruvian Amazons , Bartlett. — 11. Young individual , 

 Peruvian Amazons, Frank, 1880. — 12 and 13. Young 

 individuals. New Granada, St». Fé de Bogota, Frank, 

 1842. — 14, 15 and 16. Young males, Surinam, Frank, 

 1871; N«. 14. Bartlett, 27 March 1866. 



17. Skeleton, Brazil. 



18. Skull of NO. 2. — 19. Skull of No. 7. — 20. Skull 

 of NO. 11. — 21. Skull of NO. 12. — 22. Skull of N». 

 13. — 23. Skull without lower jaws, Brazil. 



EUROPEAN AND ASIATIC SQUIRRELS. 



Anderson ') is the first author, who endeavored to work 

 out monographically the Asiatic Squirrels. His investiga- 

 tions bear a peculiar interest, as they are based upon an 

 examination of nearly all the typical specimens preserved 

 in the large Musea, by which he was enabled to break 

 up a large series of nominal species. In the main points 

 I accept his views , there are however some particularities 

 in which I differ , as hereafter will appear. Especially I 

 cannot accept his opinion that »the dentition and the form 

 »of the skull throughout the group (viz. the genus Sciurus) 

 » rather present a remarkable uniformity". If we compare 

 for instance the skulls of Sciurus davidianus, Sciurus lo- 

 kriah and Sciurus zeylanicus with the same parts of their 

 nearest allies , it is obvious that the differences are very 

 important. The same is the case with the dentition; so 

 Sciurus zeylanictis has two upper premolars, meanwhile all 

 the other large Squirrels have a single one , so Sciurus sy- 

 riacus differs from all the other small-sized Squirrels from 

 the continent by having a single upper premolar. Gene- 



1) Anatomical and Zoological Researches and Zoological results of the Yun- 

 nan Expedition. 1878. 



Notes from thie Leyden IMuseum, "Vol. V. 



