138 PROCEEDINGS OF THE ACADEMY OF [March, 



the reference, from a copy in the Boston Public Library. From 

 this it seems that Loris Geoff, is a synonym of Tardigradus Bodd. , 

 being based upon the same two animals, L. gracilis = Slender 

 Loris and L. tardigradus = Slow Loris. Although Geoff roy 

 undoubtedly had the Slow Loris in mind for his second species, 

 as shown by his reference to Vosmaer, whose plate is excellent, 

 nevertheless in referring it to L. tardigradus Linn, he originated 

 the unfortunate error which has been almost univei-sally followed 

 by subsequent authors. The genus Nydicebm proposed by Geoff roy 

 in 1812 was unquestionably based upon the Slow Loris, and will 

 hold for it and its allies, unless Bradycebus Cuv. et Geoffr. is avail- 

 able. Their genus is said to be published in 3fem. Class. Mamm. 

 and in Mag. Encyclop., but we have not yet been able to locate it. 

 We shall have (hen the following synonymy for these genera : 



TARDIGEADirs Bodd. 



1784. Tardigradus Bodd., Elenclius Anim., p. 67 (type T. loris 



Bodd. = Lemur tardigradus Liun.). 

 179R. Loris Geoff.. Mag. Encyclop.. I. pp. 48-49. 



1811. Stenops Illig., Prodrom. Syst. Mam. et Avium, p. 73. 



NYCTICEBirS Geofif. 



1812. Xycticebus Geoff., Ann. du Mus. Paris, XIX, p. 162. Type. 

 ? 1795. Bradycebus Cuv. et Geoffr , Mem. Class. Mamm. 



After stud}'ing a number of specimens, partly from the Acad- 

 emy's collection and partly loaned by the U. S, National Museum 

 through Mr. G. S. Miller, Jr., Assistant Curator of Mammals, it 

 appears that the variation in the Slow Lemurs, recognized by 

 Anderson and Blanford as simply varietal, is worthy of a more 

 definite treatment. 



It would .«eem from the material at our disposal that there are 

 five distinct forms, which we would regard as subspecies rather than 

 as species, as they are olivioasly geographic races of one species. 

 The N. menagensis of the Philippines has not been considered, as 

 no specimens are available and it is therefore impossible to judge of 

 its relationship with the ^Malayan group. 

 The forms may be distinguished as follows : 

 a. — General color ashy-gray, slightly tinged with rufous. Crown 

 of head without an extensive patch of bro\vn. 

 b. — Head with indistinct lines extending to the eyes and ears. 

 Dorsal line fading away on crown of head, 



coueang Boddaert. 



