18/2.] DR. J. E. GRAY ON THE LEMURINA. 85 1 



are very much alike in measurement ; but the nose of one looks much 

 thicker and more rounded above than that of the other. The one 

 with the broadest nose has rather more ventricose auricular bulla?. 

 They are said to he the skulls of male and female : the one with the 

 narrower nose is said to be the female ; and this difference may be only 

 one of sex. The intermaxillary bones are very small, thin, and 

 weak. The front of the upper jaw without any teeth, and the bone 

 so thin that there is not room to hold any. Nose rather produced, 

 rounded above, and about the length of the diameter of the orbits. 

 The nose is rather conical. Ears ovate, exposed and covered exter- 

 nally with close, short, appressed hairs. Tail elongate, cylindrical, 

 rather wider at the end, and covered with softer hair, which is rather 

 longer on the end than on the other part. The skulls of the three 

 species are exceedingly alike in size and form, as figured by Pollen, 

 Faun. Madag. t. 7. f. 3. 



The fur of Lepilemur mustelinus and L. dorsalis is redder. The tail 

 of L. mustelinus is of the same colour as the back to the end ; in 

 L. dorsalis the tail is like the back for two thirds of its length, and 

 black at the end. Altogether L. mustelinus is most like L. major 

 in the uniform colour of the tail, but is entirely without indication 

 of a dorsal streak ; indeed I should not be at all surprised if all the 

 three should prove to be varieties of the same species, though so dif- 

 ferent in colour. 



The specimens of Lepilemur dorsalis in the British Museum are said 

 to be of the two sexes ; but the differences do not depend on sex. 



This animal was sent to me by Mr. Frank, of Amsterdam, as Lepi- 

 lemur rufcaudatus, Grandidier, Rev. & Mag. Zool. 1867, p. 256*, 

 which is only thus briefly noticed, — " Cinereus, rufescens, capite ni- 

 grescente, artubus posterionbus pallide cinereis. Cauda rufa. Ju- 

 gulo fulvescente abdomineque aibido. Long. tot. 56", corp. 31", 

 caud. 25"." 



I think that it can scarcely be the case, as the head is not blackish, and 

 not nearly so dark as the head of either L. mustelinus or L. dorsalis. 



2. Hapalemur, Gray, P. Z. S. 1870, p. 827; Cat. Monk. & Lem. 



1870, p. 133. 

 The teeth and lower jaw of this species are figured by Mr. Mivart, 

 P. Z. S. 1864, p. 613. (Copied, Gray, Cat. Monkeys &c. p. 77). 



Hapalemur griseus, Gray, Cat. Monkeys &c. p. 76, & p. 133. 

 Madagascar. 



3. Prolemur, Gray, P. Z. S. 1870, p. 828; Cat. Monkeys &c. 



pp. 131-133. 



The skull of this genus is figured in the P. Z. S. 1870, p. 829. 

 f. 1 & 2, p. 830. f. 3 & 4 ; and by Pollen, Fauna Madagasc. t. 7. f. 2, 

 where the skull has lost its upper cutting-teeth. 



Prolemur simus, Gray, P. Z. S. 1870, p. 828, f. 52 ; Cat. Mon- 

 keys &c. p. 133. 



Hapalemur griseus, Schlegel & Pollen, Faun. Madag. p. 6, t. 3 

 (skull). 



