a new Taco-fnco. 2-11 



Dimensions of the tyj)C (incnsurcd by tlio collector in the 

 flesh) :— 



Head and body IfiO mm. ; tail ]'J5 ; hind foot 27 ; ear 25. 



Skull*: conflylo. basal length -ilVo ; nasals, lenoth 19'8, 

 midtUe breadth 3"4, posterior breadth G"4: ; interorbital 

 i)readth 7*1 ; breadth on supraorbital ridges 9*3; breadth of 

 brain-case (c.) 18 ; height of muzzle from alveolus of 

 secator 7 ; palatal lent^th (c.) 23*5 ; breadth of palate between 

 outer corners of tn' JIT) ; combined length of three anterior 

 niolariform teeth 7. 



Bab. Pozuzo, Peru. Alt. 800 m. 



Type. Adult male. B.M. no. 12. 1. 15. 7. Original num- 

 ber 23. Collected April 1908 by L. Egg. Presented by 

 Oldfield Thomas. 



This most beautiful little opossum represents quite a new 

 type in the family Dideljiliiida?, and recalls some of the bushy- 

 tailed Australian Phalangerldiv. 



Ctenomys talarum recessus, subsp. n. 



Centre of face not blackened, the hairs there subterminally 

 ringed with drab, as on the rest of the animal. Under surface 

 with white pectoral and inguinal patches. Tail comparatively 

 short, as in true talarum, not long as in C. t. antonii; its 

 colour drab, the narrow Uj)per crest dark brown, the lower 

 white. 



Skull as in iaiarum. 



Dimensions of the ty[)e (measured on the spirit-specimen) : — 



Head and body 155 mm. ; tad 54 ; hind foot 26. 



Skull: occipito-nasal length 38; condylo-incisive length 

 38*5; zygomatic breadth 22*5; nasals 12; interorbital 

 breadth 7*7 ; upper tooth-series (crowns) 7*8. 



Ilah. Bahia Bianca, Argentina. 



Type. Adult female. B.M. no. 11. 11. 19. 14. Collected 

 by Emil Weiske. Presented by the lion. N. C. Rothschild. 

 Two specimens. 



This southern form of the Buenos Ayres Tuco-tuco has the 

 white axillary and inguinal patches of G. t. antonii, combined 

 with the short tail of true talarum, while in the absence of 

 blackening on the face and crown and the comparatively light 

 colour of the sides of the tail it differs from both of them. 



* These dimensions must be taken with a little reserve, as the skull 

 has unfortunately been seriously affected by preservatives and is imperfect 

 in various details. 



