1871.] DR. J. E GRAY ON THE BRADYPODID.4E. 441 



is not so harsh as that of the males, and is blackish grey closely 

 white-spotted ; but the colour of the face and throat are the same. 



A young specimen in the Museum, obtained from Mr. Warwick, 

 has the fur very soft and greyer than in the adult, and therefore the 

 white spots are less distinct ; the black postocular spot is small but 

 distinct. It is curious that Dr. J. A. Wagner, iu his specific charac- 

 ters of B. cuculliger, particularly marks "stria postoculari 7iul/a. ,y 

 In our specimens it is distinct, but smaller than in B. infuscatus. 



Variety. Male : the dorsal patch dark orange-yellow with a broad 

 tapering black central streak and a black spot, but with the outer 

 margin of the same colour as the rest of the back, and not intense 

 black as in the other specimen. 



Hub. ? B.M. 



2. Arctofithecus gularis. 



Fur much longer and more flaccid, brownish grey, with large 

 blotches of white on the back. 



c? . Bradypus gularis, Riippell, Mus. Senck. 1. 2. 3, p. 138, t. 



Hab. Surinam (C. Bartlett). 



We have only a skin, without the skull, of a half-grown animal ; the 

 length of the fur does not appear to depend upon age, as it is longer 

 than in the female of the more rigid-haired species iu the Museum. 

 It may prove to be a distinct species when the skull is observed. 



Wagner describes B. cuculliger as having coarse, brittle, long 

 whitish-brown hair ; and he quotes B. gularis, Riippell, as a syno- 

 nym of it. Riippell describes his species as "corpore pilis longis 

 laxis ;" and further, the hair of three kinds : — first, long, cylin- 

 drical, and soft to the feel, mostly of a blackish colour ; second, 

 more elongate and perceptibly compressed at the ends, and whitish ; 

 third, fine short woolly hair among the other, grey or white. Our 

 specimen which agrees with this is without the skull ; and Riippell 

 does not describe or figure the skull of his specimen ; so we do not 

 know if it is like, or different from, A. cuculliger. 



b. Nose and forehead covered with short soft yellow hair, ivhich is 

 erect at the hinder part of the forehead ; cheeks, chin, and 

 throat covered with thin harsher hair, like the rest of the body, 



L'Ai adulte, Buffon, Hist. Nat. vol. xiii. tab. vi. 



L'Ai second a dos bru'le, Daubeiiton in Buffon's Hist. Nat. vol. xiii. 

 p. 62. 



Acheus us/us, Lesson, Especes des Mammiferes, p. 2/1, from Buf- 

 fon's figure, is a male of a species of this section. 



The Bradypus ai and B. infuscatus of Wagler, Isis, 1831, pp. 61 1, 

 612, and B. pallidus of Wagner, appear to belong to this division; 

 but I cannot fit them on to any of the specimens in the Museum. 



3. Arctofithecus dlainvillei. B.M. 



Forehead and temples with short, erect, yellow hair ; chin, cheeks, 



