448 Mr. O. Thomas on 
Type..Old male. B.M. no, 21.4.7,6. Original number 
1226. Collected 17th November, 1920, by E. Budin. Pre- 
sented by Oldfield Thomas. Nine specimens. 
No doubt very nearly allied to C. a. menas, but distin- 
guished by greater robustness, paler and more drabby colora- 
tion, and the different angle formed at the back of the palate. 
LV.—New Sigmodon, Oryzonys, and Kchimys from 
Ecuador. By Outpririup THOMAS. 
(Published by permission of the Trustees of the British Museum.) 
AMONG some Heuadorean rodents referred to me for deter- 
mination by Dr. Kinar Lénnberg, I find examples of the 
three following new forms :— 
Sigmodon lénnberg?, sp. i. 
A very dark-coloured species with short crisp fur. 
Size large. Fur short, close, crisp, very different from the 
long loose fur of other Keuadorean species; hairs of back 
about 9-10 mm. in length. General colour above dark 
lustrous brown, near “ cinnamon-brown,” the hairs finely 
ringed with black and ochraceous buff, the rings of the latter 
colour only about 14 mm. in breadth. Under surface muddy 
greyish, the hairs washed terminally with drabby. Face 
darker than rest of body, the area between and below the 
eyes heavily blackened, but there are strongly marked oclira- 
ceous-buffy eye-rings. Ears dark brown ticked with buffy. 
Hands and feet dark greyish brown. ‘Tail fairly well-haired, 
blackish brown above, diabby brown below. 
Skull stout and heavy, with well-developed ridges. Palatal 
foramina large and open. Mesopterygoid fossa wide ante- 
riorly. Bulle very large. Incisors unusually broad and 
stout. Molars of average size. 
Dimensions of the type (measured by collector) :— 
Head and body 170 mm.; tail 100; hind foot 32; 
ear 19. 3 
Skull: greatest length 387; condylo-incisive length 35; 
zygomatic breadth 21°5; nasals 13°6 x 5; interorbital breadth 
6; palatilar length 16°5 ; palatal foramina 7°8 ; upper molar 
series (worn flat) 6°5. 
Hab. Quevedo, lowlands of Western Ecuador, due north 
of Guayaquil. 
Type. Old male. B.M. no. 21. 2.15.1. Original num- 
ber 8. Collected by Mr. F. G. von Buchwald. Received in 
exchange from the Stockholm Museum. ‘Two specimens. 
