392 MR. F. E. BEDDARD ON HAPALEMUR GRISEUS. [June 3, 



shows certain differences in size and in the colour of the fur, 

 Hapalemur simus being recognizable by the presence of a spot of 

 a uniform pale yellowish rusty colour occupying the end of the 

 rump and the upper part of the base of the tail, &C. 1 



I have myself had the opportunity of comparing the skins as well 

 as the skulls of Hapalemur griseus and H. simus; and the most obvious 

 difference between the two species, which does not seem to have 

 been noticed either by Gray or Schlegel, is a patch of spines upon 

 the arm of the former. This is figured in the drawing (fig. 1, p. 393), 

 and described more fully below. 



With regard to the differences in the skulls of the two species, I 

 have been able to verify Dr. Gray's statements with the exception of 

 what he says about the lower jaw, and the description here appears 

 to me to have been accidentally reversed. " Lower jaw weak, and 

 narrow in front, with a short symphysis," was, I think, meant rather 

 for H. griseus ; while the description of the lower jaw of Hapalemur 

 griseus, " Lower jaw broad and strong in front, with a long sym- 

 physis " should be applied to Hapalemur simus. It seems to me also 

 that Gray was right in believing that Schlegel and Pollen's figure of 

 the skull of Hapalemur griseus was in reality that of Hapalemur 

 simus. 



External characters. — In the Lemuroidea 2 generally there is 

 some diversity in the development of the digits both of the hind and 

 fore limbs, though in all (as contrasted with the Apes) the pollex 

 and hallux are invariably present and well developed. A very usual 

 character — and in this respect Hapalemur agrees with other Lemurs — 

 is that the nail of the second digit of the foot is considerably 

 elongated and claw-like. 



The fleshy pads on the palmar surface of the hand and foot in 

 Hapalemur griseus are very closely similar to those of Lemur. A 

 large pad (Fig. 1, a), broader in front than behind, extends from the 

 root of the thumb to as far back as the wrist ; a second pad (b) lies at 

 the base of the index ; a third (c) between the roots of the two suc- 

 ceeding digits ; another pad (cl), the same size as the last but slightly 

 smaller than that of the index, lies at the root of the fifth digit, and 

 behind is another long pad (e) as large as that on the radial side 

 of the hand, which extends as far back as the wrist. 



In the foot there is a large pad on the inner side of the base of the 

 hallux ; another smaller one between this and the succeeding digit ; 

 at the root of the index is a larger pad ; between the roots of the 

 third and fourth digits is another pad about half the size of the last, 

 and divided by a furrow into a larger outer and much smaller inner 

 portion ; at the root of the fifth digit is a small circular pad, and 

 behind it, reaching as far as the wrist, a long narrow pad ; on the 

 radial side of the hand close to its posterior margin is a small 

 pad. 



The colour of the palmar and plantar surfaces of the hand and 



1 Loc. cit. p. 49. 



8 Cf. Murie and Mivart's ' Anatomy of Lemuroidea, ' Trans. Zool. Soc. vol. 

 vii. p. 9, &c, for a comparison between the bands and feet of different Lemurs. 



