242 MR. OLDFIELD THOMAS ON THE MAMMALS [ISToV. 3, 



1901*, a smaller animal occurring near Kio Janeiro. It is 

 possible that the more coarsely mottled S. paraguensis will also 

 prove to grade into the present form. 



Baby specimens of minensis, chapadce, and paraguensis are as 

 readily distinguishable from each other as are the adults. 



28. Tayassu albirostris 111. 



5 . 1144, with two fcetuses 1145 and 1146. 



29. Tayassu tajacu L. 

 S. 1120,1126, 1169. 

 $. 1074. 



30. Mazama rufa F. Cuv. 



c?. 1095. 

 Yg. d. 1044. 



31. Myrmecophaga tridactyla Linn. 



S. 1128, 1180. 

 2. 1151, 1179. 



The reasons for using the above name are given in ' American 

 Natm^alist,' xxxv. p. 143 (1901). 



32. Tamandua tetradactyla Linn. 



c?. 1038, 1103, 1106, 1112, 1125, 1149. 

 2. 1017, 1058, 1084, 1181. 



33. Dasypus gilvipes Licht. 



Tatoii foyou Azara, Quadr. Paraguay, ii. p. 142 (1801). 



Basypus gilvipes 111. Abh. Ak. Berl. 1811, p. 108 (pub. 1815) 

 (nomen nudum). 



Dasyp)us gilvipes Licht. Abh. Ak. Berl. 1815, p. 215 (pub. 

 1818). 



Dasypibs encouhert Desm. Mamm. ii. p. 370 (1822). 



S. 1138, 1166, 1199. 



$. 1072. 



Under the name of Dasypus sexcinctus L. both the North and 

 South Brazilian forms of this group have commonly been con- 

 founded, but since they differ conspicuously in size and are clearly 

 different, it is necessary to consider which species should bear 

 Linnaeus's name. 



Acting on the genei^al principle that the first reference to 

 Linnseus's own works should be taken as a guide in identifying 

 his species, we get in this case a reference to the " Mus. Ad. Fr." 

 (p. 7), and the specimen mentioned in that work would be the 

 type. That specimen is still in the Stockholm Museum, and Prof. 

 F. A. Smitt has been kind enough to inform me that its cephalic 

 shield is 77 mm. in length. This corresponds closely with the 



* Ann. Mag. N. H. (7) viii. p. 535. 



