500 Mr. O. Thomas on small Mammals. 



tliicker and more strongly curved tlian in any other member 

 * of the genus, the incisive angle 83°. Molars broad and 

 lieavy, the series more bowed out mesially tlian in other 

 species. 



Dimensions of the type: — 



Head and boly 400 mm. ; tail 350; hind foot 95; 

 ear 74. 



Skull: greatest length 88"5 ; condylo-incisive length 81 ; 

 zygomatic breadth 46'5 ; nasals 32*7xll'3; suprameatal 

 islet 6 X (! ; palatal foramina 15'5x4'(j ; diameter of bullae 

 at right angles to their longest axis 13 ; upper tooth-series, 

 length (alveoli) 20, greatest breadth across tlie two series 22 ; 

 breadth of 7n^, on lamina, 5*6. 



Type. Adult female (basilar suture closed, but its position 

 perceptible). B.M. no. 19.2.7.57. Original number 333. 

 Collected 24th August, 1918. 



Tiie members of this genus appear to be more constant in 

 their skull-characters than has been supposed, and I find that 

 five adult skulls of h. txicumanum agree closely among them- 

 selves and equally differ from the i)resent specimen in the 

 characters above referred to. L. cuscus, from Bolivia, more 

 distant in locality, has a skull rather more similar to that of 

 L. lochwoodi, but has smaller bullse and no tendency towards 

 the abnormally heavy incisors of the new form. 



Philippi's L. crassidens,w\i\\0Vii locality, named incidentally 

 in his descrifjtJon of jL. lutescens * (itself apparently referable 

 to L. cuvleri), would appear to be the ordinary Chilian form 

 L. viscacciu, Rlol., and is certainly nut L. hckwoodij as the 

 visibility from below of the nasals outside the premaxillae is 

 especially insisted on, this being in distinct contrast to the 

 conditions in L. lockwoodi, while it is not infrequently found 

 \n L. viscaccia. 



In naming this fine mountain chinchilla after Mr. Charles 

 Lockwood I may again refer with gratitude to the great 

 assistance he has been in arranging all the financial and 

 business details of the Budin expedition, an assistance witiiout 

 which we should have found great difficulty in carrying it on, 



14. Galea sp. 

 cJ. 358 (immature). 



• Ann. Mus. Chili, pt. 13, p. 8 (189G). 



