new S.- American Mammals. 575 



Dr. Allen, in his recent paper^ considers his M. peruanus 

 as only doubtfully distinguishable frooa Gray's '■'' Macroxus 

 luIiUi," said to have been collected by Castelnau, and there- 

 fore thought by Dr. Allen to have come from somewhere on 

 the Upper Amazon?. But Dr. Allen has quite misunderstood 

 the characters of kuhli*, which is beyond question the 

 " Sciunis pusiUus''^ o^ G:Vi\r\n-A, whence the type must have 

 come — probably accidentally mixed with Castelnau material 

 bj' the dealer (Paizuduki) from whom it was bought. The 

 fact that the hind foot of the type of kuhli is only 2C mm. iu 

 length would alone distinguish it from any of the Andean 

 Microsciuri. 



Most opportunely three specimens of the Guianan pigmy 

 squirrel have just been received from the late Mr. McConnell's 

 collector Cozier, one of them having a perfect skull, and I 

 am now able to state that this animal is not a Microsciurus at 

 all, but represents a new genus allied to the Malayan and 

 W. -African pigmy squirrels. Its description is given else- 

 where, but a new subspecies of it may be here described : — 



Sciurillus pusillus glaucinus, sub.-p. n. 



Like S. pusillus, but much paler throughout. 



General colour above " neutral grey " instead of greyish 

 liair-brown. Under surface pale grey washed with lioht 

 bufFy, instead of dark grey washed with fulvous. Crown, 

 muzzle, and inner side of ears pale grizzled buffy, many 

 shades lighter than the almost ferruginous colour of pusillus. 

 Back of ears and patches behind them prominently snowy- 

 white. Feet grizzled buffy. Tail-hairs tipped with whitish, 

 a number of hairs in the terminal pencil black, a line alono- 

 the centre below also black. 



Skull apparently rather smaller than in pusillus, but the 

 type is not as old as the available examples of that animal. 



Dimensions of the type (measured on the skin) : — 



Head and body 10-1 mm.; tail 113; hind foot 27*7. 



Skull: greatest length 27-5; condylo-incisive length 25 ; 

 zygomatic breadth 20 ; nasals (on outer edge) 7 x4'7 ; inter- 

 oibital breadtli 12-5 ; breadth of brain-case 15 ; palatilar 

 length 10; upper tooth-series (exclusive of p^) 3*8. 



Ilab. Great Falls of Demerara River, British Guiana. 



Tji/pe. Adult nvA\ B.M. no. U. 4. 21. 1. Collected 

 by Cozier in i^.ugust 1913, and presented by Mrs. F. V. 

 McConnell. 



* If this has been at all due to any statement or omission in my letters 

 to him on the subject, I must ask his pardon. 



