100 ALLEN’S NATURALIST’S LIBRARY. 
same size as the type, but is a melanistic variety, for a series of 
specimens show every intermediate shade between that here 
described and the Biack Siraka (P. holomelas), which is of 
an entirely black colour, and inhabits, as has been shown 
by MM. Milne-Edwards and Grandidier, the same region as 
P. edwards. 
Distribution The typical form of the species is confined to 
the extended region on the east coast of Madagascar lying 
between the Bay of Antongil on the north, and the River Masora 
in the south, in the forest-belts on the eastern aspect of the 
mountains, where rain falls abundantly and the whole region is 
covered with luxuriant vegetation. Its melanistic variety (P. 
edwards?) extends south from the Masora as far as the Faraouny 
river, but it ranges to higher and colder altitudes on the 
mountains ; while its albinistic variety (7. sevéceus) lives in the 
somewhat warmer region to the north of Antongil Bay, each 
being, to south and north respectively, conterminous with the 
central habitat of the typical form. 
II. VERREAUX’S SIFAKA. PROPITHECUS VERREAUXI. 
Propithecus verreauxi, Grandid., Album de Vile de la Réunion, 
iv., pp. 153-162, pls. 1, 2 (1867); Milne-Edwards and 
Grandid., Hist. Nat. Madag., Mamm., i. p. 305 (with 
full synonymy), Atlas, pls. 4, 6, 8. 
Characters—F ur short and woolly ; face entirely naked ; head 
longer than broad; a well-marked swelling of the skull between 
the eyes ; the upper incisors sub-equal. Smaller and more 
robust than P. diadema, the head longer, the hair on the 
limbs shorter, the tail longer. 
