106 ON DACTYLOMYS DACTYLINUS 



nose: y> Dactylomys supra flavus, nigro-adspersus , subtus 

 pulchre ochraceus ; unguibus dilatatis ; cauda tota pilis 

 vestita." The named author published later on ^) a more 

 detailed description based upon the same type-specimens 

 from Natterer's collections. In that paper Wagner makes 

 no mention of skull or dentition. The very exact descrip- 

 tion of the external parts ends with the following terms : 

 »Natterer erhielt 2 Exemplare, Mannchen und Weibchen, 

 aus den Waldungen von Ypaneraa (Provinz San Paulo). 

 Diese Thiere leben auf Baumen , klettern sehr gut und 

 tragen in Baumhöhlungen Vorrathe von Samen und Früch- 

 ten fur den Winter zusammen. Das Weibchen war mit 

 einem Jungen trachtig." 



As far as I am aware no other specimens of this spe- 

 cies have been brought over to Europe , or have been descri- 

 bed or mentioned up to the year 1867; in the interim 

 Wagner's paper was the only source. D. amhlyonyx was 

 unknown or ignored by Mr, Deville, who in 1852^) 

 wrote: »il n'existe dans ce genre (Dactylomys), qu'une 

 seule espèce .... caractérisée par Mr. Isidore Geoffroy- 

 Saint-Hilaire, Dactylomys typus Is. G. S. H." 



In 1872 Mr. R. HenseP) read a paper entitled: »Bei- 

 trage zur Kenntniss der Saugethiere Süd-Brasiliens", be- 

 fore the members of the ))Akademie der Wissenschaften zu 

 Berlin", after haviug shortly mentioned in 1867*) his 

 specimens of Dactylomys amhlyonyx , and after haviug pu- 

 blished in »der Zoologische Garten 1872", a paper concer- 

 ning more especially the biology of the mammals observed 

 or collected by himself in Southern Brazil. He explained 

 in a very satisfactory way why specimens of Dactylomys 

 amhlyonyx are so rarely to be found in European Musea: 



1) Abhandlungen der 11. Classe der Kon. Akademie der Wissenschaften, V. 

 Bd., II. Abth., p. 304. 



2) Revue et Magasin de Zoölogie, 1852, p. 556. 



3) Abhandlungen der Kön. Akademie der Wissenschaften zu Berlin, 1873; 

 Der Zoologische Garten, 1872, p. 80. 



4) Sitzungsber. der Gesellschaft naturforschender Freunde zu Berlin, 1867, p. 21. 



Notes from the Leyden Museum, Vol. ^XJLII. 



