(198 Bulletin American Museum of Natural History. [Vol. XXXIV, 
In my paper on Microsciurus (I. c.), Macroxus kuhlit Gray was given 
provisionally as a species of Microsciurus, on the assumption that the type 
of kuhlit was obtained by Castelnau, as stated by Gray, and that it hence 
was probably collected on the Ucayali River during his journey across 
Peru. It was further suggested that such being the case the name kwhlo 
might have to replace my name peruanus for a species of Microsciurus from 
near the supposed type locality of kuhliz. Since this paper was published 
Thomas has stated that the type of kuhli “is beyond question the ‘ Scowrus 
pusillus’ of Guiana, whence the type must have come — probably acci- 
dentally mixed with Castelnau material by the dealer (Parzudaki) from 
whom it was bought. The fact that the hind foot of the type of kuwhlzz is 
only 26 mm. in length would alone distinguish it from any of the Andean 
Microscur.”’ It is to be hoped that this decision by Thomas will give the 
troublesome name “ Macroxus kuhlu Gray’ a final resting place as a syno- 
nym of Sciurillus pusillus. 
Sciurillus pusillus glaucinus Thomas. 
Sciurillus pusillus glaucinus THomas, Ann. and Mag. Nat. Hist. (8), XIII, p. 575, 
June, 1914. 
Type locality.— Great Falls of Demerara River, British Guiana. 
Geographic distribution.— Known only from the type locality. 
Description.— “Like S. pusillus [pusillus], but much paler throughout. 
“General colour above ‘neutral grey’ instead of greyish hair-brown. 
Under surface pale grey washed with light 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 along 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 104 
min: tail 113; hind foot;:27:7: 
“Skull: Greatest length 27.5; condylo-incisive length 25: zygomatic 
breadth 20; nasals (on outer edge) 7 X 4.7; interorbital breadth 12. bs 
breadth of brain-case 15; palatilar length 10; upper aeres (exclusive 
of p*) 3.8.”— Thomas, I. c. 
Specumens examined, 0. 
Remarks.— Known to me only from Thomas’s description, quoted above 
in full. 
