from Xorth-westeni Patayonid, 203 



greyish slaty band, dividini^ the subdued buffy area of the 

 buck from tlio ;^reyish wliit>! of the b»dly, while in suffusus 

 the same hiteral re<^ion is biitly brownish in conlinuition with 

 tlie back. Ears with a fairly well-marki'il ;^revish-whife s(jot 

 at their notch and on the base ot the meteniote. Under 

 surface clear f^reyish white, quite as in anjfnsus. Fe;«t white. 

 Tail detinitely bicolor, blackish above, wliitisii below, as in 

 sujj'usus. 



ISkuil as in suffusus. 



Dimensions of the type : — 



Head and body 97 mm. ; tail 68; hind foot 2ii'5 ; ear 17. 



Skull : greatest h-n^^th 29 ; condylo-incisive length 25'ii ; 

 zygomatic breadth 14*2 ; interorbiial breadth -k'H ; breailth 

 of brain-case 13 ; palatal foramina G'G; upper molar series -I'l. 



Hub. as above. 



T(/pe. Adult male. B.M. no. IS. 12. 2. 22. Original 

 number 204. Collected 2nd May, 1918. 



This form, by its more subdued colour as compared with 

 true su^'usus, forms a step towards th6 following subspecies. 



9. Ahrothr'ut suffusus rncereyis, subsp. n. 



(?. fi2, 70, 75, 76, 77, 78, 79, 80, 81, S2, 83, 84, 89, 90, 

 93, 97, 99, lUl, 107, 112, 115, 110 ; ? . (io, 67, G8, 69, 74, 

 S6, 104, 106, 110, 117. Beatriz, Xaliuel Huapi. 800 m. 



Much darker than true suffusus or tiie previous subspecies, 

 the back dark brown almost without buffy, and the belly — 

 which is practically white in 5M^«SM5 and tnod^sti'V — "deep 

 dull grey," very much as in tlie Chilian lonyipihs. Ears 

 almost without greyish patches at their bases. Hands and 

 feet grey, near " [)ale neutral giey.*^ Tail averaging a little 

 shorter than in the other forms, and less markedly bicolor, 

 blackish above, greyish below. 



Skull as in suffusus. 



Dimensions of the type : — 



Head and body 110 mm.; tail 72; hind foot 225; 

 ear 16. 



Skull: greatest length 29; condylo-incisive length 26; 

 zygomatic breadth 14; interorbitul breadth 5; brea Ith of 

 brain-case 12*4; palatal foraina 66; upper molar series 4*2. 



IJctb. as above. 



7y/>e. Old female. B.M. no. 19. 1. 1. 22. Original 

 imn»ber 104. Collected 25th February, 1918. 



This form of Abrut/nix, from the lake-region of Nahuel 

 Huapi, is, so far as colour is concerned, much more distinct 

 from A. suffusus than is that of Maiten, and I have hesitated 



