1900.] Allen, The Generic Names Didelphis and Philander. 189 



phaga Zimmermann, D. murina Linn., etc., leaving D. virginiana 

 and D. azara in Didelphis. No type was designated, but the first 

 species was D. nudicauda Desm., which later became the type of 

 Metachirus Burmeister. Still later the name Philander was used 

 by Burmeister (1856) in a generic sense with D. philander Linn, 

 as the type. 



As already shown, however, both Sarigua and Philander are 

 properly synonyms of Didelphis, and as a new name should be 

 provided for the genus of late recognized under the name Philan- 

 der, I suggest Caluromys, with Didelphis philander Linn, as 

 type. 



Caluromys will include not only the species now usually referred 

 to Philander, but also Didelphis cinerea Temminck, now com- 

 monly placed in Marniosa ; as D. cinerea agrees with the former 

 not only in external characters, as notably in the heavily furred 

 basal portion of the tail, but also in the principal characters of 

 the skull, as in the presence of well-developed postorbital pro- 

 cesses and in the absence of large vacuities in the posterior 

 palate, in comparison with the species of the Marmosa group. 

 The forms of Caluromys will thus stand as follows : 



1. Caluromys philander (Linn.). Guiana, Venezuela, and 

 northeastern Brazil. 



2. Caluromys cicur (Bangs). Northeastern Colombia. 



3. Caluromys affinis (Wagner, ex Natterer MS.). Matto 

 Grosso, Brazil. 



4. Caluromys trinitatis (Thomas). Trinidad. 



5. Caluromys derbianus (Waterhouse). Ecuador (?) ; Central 

 America. 



6. Caluromys derbianus ornatus (Tschudi). Peru. 



7. Caluromys laniger (Desm.). Paraguay. 



8. Caluromys laniger guayanus (Thomas). Western Ecuador. 



9. Caluromys laniger pallidus (Thomas). Northwestern Pan- 

 ama. 



10. Caluromys cinereus (Desm.). Southeastern Brazil. 



ii. Caluromys alstoni, sp. nov. 



Didelphys cinerea, ALSTON, Biol. Centr.-Am. Mamm. 199, pi. xxi (Oct. 

 1880). Not of Temminck. 



Type, No. Hff, $ ad., Tres Rios, Costa Rica, Aug. 17, 1893 ; coll. 

 George K. Cherrie. Cotypes, I ? ad. and 4 young, one fourth to one half grown. 



