1890.] SOUTH-AMERICAN CANlDiE. 105 



C.griseus being reddish grey and C. entrerianus a rusty ^ yellowish red. 

 The long bristly hairs are black on the distal half and with a broad 

 white ring lower down, which, however, is wanting in that of the 

 end and dorsum of the tail and hindmost part of the back ; so that 

 these parts are darker. Dorsum of muzzle, crown, and outside of 

 ears reddish brown, but the hairs have white points which especially 

 produce a light spot over each eye. Upper lip, chin, front of throat, 

 breast, and inner side of limbs pure white. A sable transverse band 

 across the upper part of the chest. Outside of limbs and behind 

 the ears pale rusty-yellow. Soles of the feet reddish. A transverse 

 rusty-brown stripe above the heel, becoming black on the bend of the 

 knee. Underjaw and middle of chin also black. Ears whitish 

 yellow within ; nose black. Ears without, pale brown. 



The skull is said to be much like that of his C. griseus but some- 

 what shorter, especially the facial portion. The frontal region broader. 

 Burmeister says much here and elsewhere about the precise deve- 

 lopment of the postorbital processes ; but these parts I have found 

 to vary much in skulls of undoubtedly the same species. The 

 dentition is said to agree with that of O. griseus, except that 

 all its parts are shorter. Length of upper fourth premolar 12 ; 

 length of the two upper molars 14, or as 100: 116. 



These characters seem to me to be in so many respects intermediate 

 between C. azarcB and his C. griseus, that bearing in mind the, to me, 

 unsatisfactory character of his species C. griseus and C. entrerianus, I 

 cannot feel satisfied as to its specific distinctness. 



I fully concede, of course, that it may be a good species, but I 

 would provisionally regard it as another local variety (from the 

 neighbourhood of Mendoza) of C. azarce. 



My distrust of Burmeister's specific determinations reposes in part 

 on considerations derived from the two following forms : — 



These are his (7) Canis vetulus and (8) C.fulvicaudus. Both 

 these names were proposed by Lund for forms described by him 

 (Blik paa Brasiliens Dyreverden, femte Afhandling (Copenhagen, 

 1843), pp. 20-31, pis. xl. and xlii.). 



They were differentiated by him as follows : — 



C. vetulus. C. fulvicaudus. 



Body and limbs slender; above Body and limbs somewhat 



light ashy grey. Limbs below slender ; above whitish grey, 

 isabel-yellow ; end of the tail Limbs below brownish yellow ; 

 and a fourth of its length black. end of the tail and a patch upon 



its dorsum yellowish red. A 

 patch of ochre-yellow behind 

 the ear. 



These distinctive characters seem to me to depend almost entirely 

 on the tail, and when I reflect how I have found species of Canidce 

 described as having a black end to the tail, with a white end and 



^ But in describing G. entreriamcs he says " rothlich gelbbraun " and not 

 " rostgelbroth," as in his reference to it here. 



