848 DR. J. E. GRAY ON THE LEMXJRINA. [NOV. 19, 



a disease of the bone. This is probably from the animal having died 

 in confinement. There is only a single skull of each of these species 

 or varieties in the British Museum ; and the differences appear to be 

 individual rather than specific ; probably the one with the broad 

 nose is a male and the rest are females, or the converse. 



Indris. 



The Indri {Indris brevicaudatus), like the Propitkecus, appears to 

 vary a great deal in the amount of white with which the general 

 black colour of the animal is variegated. The British Museum has 

 received a specimen of the animal which has been described as a 

 species by Dr. Peters (Monatsb. 1871, p. 360) under the name 

 Lichenotus mitratus, brought by Mr. Crossley from Sera Lalaw. It 

 is peculiar for having, in addition to the white rump of the other 

 species, a white ruff round the neck and on the back of the head ; 

 and the outer side of the fore and hind legs and the sides of the body 

 are more distinctly white than in the common Indri. I have com- 

 pared the skull with that of the common black Indris brevicaudatus, 

 and can find no difference, any more than I can any organic difference 

 in any other part of the specimens ; I believe that, like the white speci- 

 men called Simpound (Indris albus, Vinson, Compt. Rend. iv. p. 829), 

 it is only an accidental variety. These black Indrisina appear to be 

 peculiarly liable to become variegated with white, or even to become 

 entirely white, or with a very small amount of black only*. s 



I propose to replace the table of the genera ofLemuridse, which 

 have six cutting-teeth in the lower jaw, and six grinders on each side 

 of each jaw, given in the appendix at the end of the ' Catalogue of 

 Monkeys and Lemurs in the British Museum' (1870, p. 131), by 

 the following. I may state that there is a mistake in that table 

 caused by leaving out a line. 



Table of Genera. 



I. Intermaxillaries very small, truncated in front. Cutting-teeth 

 none, or two, one behind the other, at the base of the canines. 

 Ears moderate, hairy. Lepilemurina. 



1. Lepilemur. Upper cutting-teeth none. Ears moderate. 



2. Hapalemur. Upper cutting-teeth 2-2. Nose narrow in front. 



3. Prolemur. Upper cutting-teeth 2-2. Nose broad, truucated 



in front. 



II. Intermaxillaries prominent and arched in front. Upper cutting- 

 teeth in a curved series, the two middle usually longer and larger 

 than the others and converging towards the central line. 



A. The ears moderate, covered externally with fur, the tail long. 



* 



The British Museum has since received a specimen with a white patch over 

 each eyebrow, the fore legs nearly to tbe hands, the hinder part of the thigh, the 

 legs from the knee to the ankle, and the whole underside iron»grev. {I. varie- 

 gatus, Ann. & Mag. N. H. 1872, x. p. 474.) 



