916 OLDFIELD THOMAS 
that the difference in colour is due not to specific distinctness, 
but to individual dimorphism, altogether independent of sex, 
season or locality. 
This dimorphism is curiously paralleled by that shown by the 
two forms of Seiwrus bicolor, the one black and the other cream- 
coloured, just as in this gibbon. 
One of the Taho specimens is remarkable for having dark 
hands and feet and is therefore without the most characteristic 
mark of the species: in face markings and all other characters 
however it is absolutely identical with the other two. 
Signor Fea states that this species is not found above an 
altitude of about 4000 feet. 
3. Semnopithecus obscurus, Ret. 
a. 6. Cadu Ciaung, N. of Bhamo. 19. 4. 86. 
ce. of “ Mountains between the Rivers Meekalan and Kyeat, ” 
Mooleyit, 800-1200 m. alt., 4. 87. 
d. £ Mt. Mooleyit, 1000-1200 m., 26. 3. 87. 
e. f. 3 2 Thagata, 400-700 m., 4. 87. 
ORE ah oo 
h. i. 2 young. Taho, 2. 88. 
TE Yado, 12. 87. 
The locality at which Signor Fea obtained specimens a and d 
considerably extends the known range of this species, as it had 
not previously been recorded north of Tenasserim. 
4. Macacus assamensis, McCt. 
=) 
. juv. skin. 21. 8. 86. Tapen R.; In the forest 2 miles N. of Bhamo. 
. &. Tounghoo. 1000 m., 22. 12. 87. 
(Sal 
5. Macacus nemestrinus, L. 
a. imm. skin. 9, 5. 87. Kokareet, Tenasserim. 
6. Macacus leoninus, Buy. 
ARONDaho 294288) 
