0)0 



Mr. E. 11. Waite on 



the level of the base of the canine ; posterior |)alat;\l vacuities 

 opjiosite the molars and last two premolars *. Molars small 

 anil ilolicati'. 



Dimensions of the type (measured by collector in the 

 flesh) :— 



Head and body 1G8 millim. ; tail 120; hind foot 25; 

 ear 18. 



Skull: extreme length 35; greatest breadth 17"8; nasals 

 16x4*2; interorbital breadth 63 ; ))ahite length from iien- 

 selion 17'5; breadth at corners of tn.^ 10; palatal foramina, 

 length 32 ; combined lengths of pin.* aTid ms.^'^ {ms}'^ of 

 Catalogue) 5" 6. 



Ilab. liio Cauqueta, a tributary of the Cauca, near Cali, 

 Colombia. Alt. 1000 m. 



%^e. Male. B.M. no. 1)9. 9. G. 51. Original number 470. 

 Collected August 1897 by J. H. Batty. 



This species is evidently a Colombian representative of the 

 Brazilian M. incana and the Venezuelan J/, fuscata, but 

 may be readily distinguished from either of them by the 

 characters above given. The three form a special group 

 characterized by their small brain-cases and long narrow 

 unridged interorbital regions. 



I 



XXVIII. — T/te Generic Name Thylacomys. 

 By Edgar R. Waite, F.L.S. 



Mr. T. S. Palmer's paper "On Thylacomy.t, Owen " f, re- 

 calls my note, published the previous year \, on the spelling 

 of this name, and on its pcssibly jeopardizing a term a|)pli('d 

 by myself to a new genus of Australian rodents §. In this 

 iiotel mentioned that, not having access to the work in which 

 the name originally occurred — namely, Blyth, in Cuvier'a 

 * Animal Kingdom,' 1840, p. 104, — I had referred to the 

 editions of 18^9 (p. 104) and 1863 (p. 92), but there found 

 the spelling to be Thalacomys^ not TliyJacomyft. As a result 

 of my note I almost expected that some zoologist in London 

 to whom the 1840 edition is available would have cleared up 

 the matter ; but 1 have not seen any further reference to it. 



* Accepting the cheek-tooth formula as four premolars and three 

 molars, the third of the premolars being the "p.* " of tlie Catalogue, and 

 being the only tooth of the " permanent " series (see Lydekker, P. Z. S. 

 1898). 



t I'almer, Ann. k Mag. Nat. Hist. (7) iv., Oct. 1899, p. 300. 



X Waite, loc. cit. (7) ii., Aug. 1898, p. 190. 



S Waite, Proc. Rov. Soc. Vict. (n. .?.) i. 1898, p. 121. 



