14 
REVISTA CHILENA DE HISTORIA NATURAL 
attaining almost to « tawny ». A distinct white spot on each 
axilla and on each side of the ingninai region. Dorsal dark 
line little marked. Head like back. Ears comparatively short, 
thickly and closely caired, their backs black, their inner surfa- 
ces with whitish hairs, and there is a marked line of creamy- 
tipped hairs running across their bases above. Arms with 
tawny-tipped hairs, the tawny or yellowish colour extending 
to the tips of the toes. Hind limbs duller, more brownish clay- 
colour; the feet very large and heavy. Tail far finer than in 
an}^ other form, immensely bushy, the hairs of its dorsal crest 
attaining over 150 mm.; in colour the upper crested side is 
mixed black and butt* or ochraceous l)utt'; underside black, 
finely grizzled with glossy ochraceous butt. 
Skull comparatively large and heavy; nasals expanded in 
front; palatal foramina rather short; bullae not so much swol- 
len as usual. 
Dimensions of the type (measured in the flesh): 
Head and body 470 mm; tail 305; hind foot 107; ear 65. 
Skull: greatest length 91; basilar length 75,5; zygomatic 
breadth 50; breadth of brain-case on parietal bones 34,2; 
length of up{)er tooth series (crowns) 22. 
Hah. — Sierra de los Baguales i de las A^izcachas. lat. 50^^50^ 
S., long. 72*^20' W., on the l)oundary between Chili and Ar- 
gentina. 
Type. -Adult female. B. M. n.^^ 7-4-5-6. Original number 
277. Collected 1 st. February, 1907, by Mr. John A. Woiff- 
sohn. Three specimens. 
In the interesting account which Mr. Wolffsohn has sent 
me of the capture of these specimens, he states that: 
«Mr. Ferrier, who owns a farm in that district, at the foot 
of Mount Payne, says that the Sierra de los Baguales is known 
to be tlie most southern part in which Vizcachas occur, and 
between that range and much farther north there are none 
atah...». 
The species is readily distinguishable from all other mem- 
bers of the genus by its large size, rich colour, long fur, 
immensely bushy tail, and short black ears. 
With characteristic modesty Mr. Wolffsohn has suggested 
that the species should be named after Mr. Mc-Clelland, the 
President of his Company, to whom he owed the pleasure of 
his trip to Patagonia, but in view of the immense amount of 
help we have received from Mr. Wolffsohn, I have A^entured 
to disregard his request, and to name this fine animal after him. 
