384 On new Foxes from Northern Argentina. 
greyish, tinged with buffy, chest and inguinal region whiter. 
The usual blackish chin-patch present, but not very strongly 
contrasted. Hind feet whitish, tinged with ochraceous 
externally. Tail as in gracilis. 
Skull conspicuously smaller than in gracilis, with shorter 
muzzle and more globose brain-case. Nasals short, but as 
broad as in gracilis, Interorbital region broad, with sharply 
defined pointed postorbital processes, the concavity behind 
which is short and angular. Top of brain-case with a large 
lyrate intermuscular area, much larger than in similarly aged 
specimens of gracilis. Bulle small. 
Teeth as in gracilis, but smaller throughout. 
Dimensions of the type :— 
Head and body 670 mm.; tail 310; hind foot 110; 
ear 72. 
Skull (those of an adult female gracilis in brackets) : 
greatest length 115 (132); condylo-basal length 110 5 (128) ; 
zygomatic breadth 64 (63); orbit to tip of muzzle 46°5 (56:3) ; 
nasals 36 (44) ; interorbital space 22 (24) ; tip to tip of post- 
orbital processes 34°7 (32) ; intertemporal breadth 28°3 (25°3) ; 
breadth of brain-case 43°7 (44) ; breadth of lyrate area on 
crown 27 (17) ; palatal length 58 (67) ; breadth between 
outer corners of m* 34 (386); p*, length on outer edge 10°5 
(11:3) ; combined length of p* and two molars 23°7 (24). 
Hab. Chumbicha, Catamarea. Alt. 500 m. 
Type. Old female. B.M. no. 18.11.11. 85. Original 
number 385, Collected 30th September, 1918, by HE. Budin. 
Presented by Oldfield Thomas. 
This fox, though externally similar to P. graczlis, has so 
very much smaller a skull that it should apparently be specifi- 
cally distinguished. The short muzzle, the broad inter- 
orbital region with sharply defined postorbital processes, and 
the large lyrate intermuscular area on the crown all seem to 
indicate that it is distinct from the older-known species. 
Specimens of P. gracilis are in the Museum from 
Tucuman (Vipos and Tapia), Cordova (Cruz del Eje), and 
Mendoza (Palmeira)—practically the type-locality. Further 
south foxes from Pilcafieu and the Valle de Lago Blanco, 
Chubut, represent P. grisea, a form from which P. gracilis 
is really most doubtfully distinguishable, as .are also the 
“Chilla” foxes from west of the Andes. Perhaps gracilis 
should be treated as a subspecies of grisea, but, in any case, 
the fox with the peculiar small skull now deseribed would 
seem to need a special name. 
It is impossible to make any satisfactory identification of 
