Mammals from Central Cordova. 243 



of (he lower rump, as liave all the specimens that have been 

 described by different authors. But iMr. ISiinons's two 

 specimens from the salina country of Cordova have no trace 

 of this marking, the grey of the hack keeping the same tone 

 throughout. 



Skull and dentition as in the typical form. 



Dimensions of the typo : — 



Head and body 740 millim. ; tail 45; hind foot, s. u. 165, 

 c. u. 180; ear 107. 



Skull*: greatest length 138; basilar length 108'5 ; 

 greatest breadth 66. 



Type. Old female. B.M. no. 2. 2. 5. 24. Original num- 

 ber 1721. Killed 2nd December, 1901. 



The discovery of the large form of DoUchotis in the same 

 country as the little ]). salinicola is of much interest, for 

 hitherto the latter had been supposed to represent D. magel- 

 larn'cns in this region. I have little doubt tliat the '' adult 

 specimens of D. salinicola " referred to by Burmeister in his 

 second communication on the subject f really belonged to the 

 present form. The range there given is from Chafiar, close 

 to Cruz del Eje, nortliwards to Santiago del Estero. 



There is a striking difference in the breadths of the nasals 

 in the two specimens, these being 20"5 millim. broad in the 

 measured skull and 25'5 millim. in the other. 



It is probable tiiat I shall prove to be wrong in only 

 describing this animal as a subspecies, but in the absence of 

 cranial distinctions and without any certainty that the ranges 

 and characters do not intergrade, 1 prefer for the present not 

 to call it a separate species. 



11. DoUchotis salinicola, Burm. 



2 c? , 2 ? , and two foetuses in spirit. 22nd to 28th No- 

 vember, 1901. 



These specimens are of the utmost value to our collections, 

 as, although no one should have any doubt as to tiie validity 

 of Burmeister's species |, yet its distinction from J}, magel- 

 lanicus has been called in question by Remy Saint Louj), and, 

 owing to the difficulty of distinguishing old specimens from 

 young in this family, its exact status is still little known. 



Some of the confusion has no doubt been caused by the 

 fact that D. magellanicus centricola, which has some of its 

 colour-characters, occurs in the same region, and has therefore 

 been not unnaturally taken for the adult of JJ. salinicola. 



* Of either a or b, the labels having been displaced, 

 t P. Z. S. 1876, p. 4(51. 



X Cf. Bergr, Com. Mus. Buenos Ayres, i. pp. 23 & 44 (1898), where 

 the rather complicated literary history is clearly traced. 



