186 On new Rhipidomys ce. from 8.E. Jujuy. 
Hab. Sierra de Santa Barbara, 8.E. Jujuy. Type from 
Sunchal, alt. 1200 m. ; other specimens from San Rafael, 
1000 m. 
Type. Adult male. B.M.no, 21.1.1.54. Original num- 
ber 1033. Collected 14th June, 1920, by E. Budin. Pre- 
sented by Oldfield Thomas. Twenty-nine specimens in all. 
When I described C. sylvanus and C. sylvanus utibilis I 
stated that these forms were very closely allied to C. budini, 
and I have now come to the conclusion that all three, and 
the new form here described, should be united specifically, 
and be considered as four subspecies of one species. 
True budini has whitish feet, unblackened muzzle, and no 
axillary or inguinal patches. C.b. sylvanus is very dark- 
coloured throughout, but without local markings, and has a 
nearly naked tail. C. b. utdbilds, of which Sr. Budin has now 
sent over a score from Caimancito, near Yuto, has usually no 
black patch on the muzzle, but almost invariably has well- 
marked axillary and inguinal white patches. Curiously 
enough, it is also very liable to melanism, nearly half the 
specimens sent being glossy black everywhere except on the 
white patches below. No melanistic examples occur among 
the series of C. b. barbarus. 
Marmosa elegans sponsoria, subsp. n. 
Like M. e. cinderella, but with more elongate skull. 
Colour in all respects as in cinderella*, and similarly 
differing from that of M. e. pallidior. On the middle of the 
chest there is a patch where the hairs are white to the base, 
but this, though omitted in the description, is also present in 
cinderella. Skull much more elongate than in the other 
subspecies, the length materially greater, while the breadth is 
the same or even less. Supraorbital edges rounded, without 
trace of sharpened edges. 
Dimensions of the type :— 
Head and body 103 mm.; tail 143; hind foot 16°5; 
ear 24°05. 
Skull: upper length 30; condylo-basal length 29°7 ; zygo- 
matic breadth 15°7 ; nasals 12°8 x 3; interorbital breadth 5 ; 
breadth of brain-case 11:4; palatal length 16°5; front of 
canine to back of last molar 11°8; three anterior molariform 
teeth 5:1. 
Hab. Sierra de Santa Barbara, 8.K. Jujuy. Type from 
Sunchal, 1200 m. 
* Described, Ann. & Mag. Nat. Hist. (7) x. pp. 159, 161 (1902). 
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