MAMMALS FROM BURMA 933 
firstly with sexual ornamentation in the form of black lines 
either on the back (‘), or on the belly (7), and secondly with 
a tendency to albinism (partial (3) or total (*)) and melanism (°), 
would account for every one of the remarkable series of varia- 
tions that have been described in these squirrels (5). 
The different races, however, where locally constant, will no 
doubt be best distinguished by subspecific names, trinomial 
nomenclature appearing to offer the only means of properly 
designating them in accordance with the facts of the case. 
In connection with these colour variations, there is one point 
in which collectors can lend considerable aid to systematists , 
and that is by trying to find out how far the members of any 
single litter of young are like or unlike each other and their 
parents. 
8959. Sciurus rufigenis, Buranr. 
16 specimens. Top of M.' Mooleyit, 1800-1900 m. March, 1887. 
2 » Plapoo. March and April, 1887. 
10 » Taho, Meteleo and Cobapò, Carin Hills. 
© Head and body 204 mm.; tail 149; hind-foot, 46; ear, 15; 
hairy part of sole 9; heel to front of long postero-internal pad 
23; length of that pad 11; average breadth 2; breadth of foot 
at base of digits 10.8. Mammae one lateral and two inguinal 
pairs = 6. 
This rare species has only previously been obtained by Messrs. 
Davison and Limborg, who collected for Mr. Hume the speci- 
mens originally described by Mr. Blanford (") and now in the 
British Museum (8). The present series is of value owing to 
the majority of the specimens being preserved in spirit, and 
(1) S. atrodorsalis. 
2) S. quinquestriatus. 
(5) S bocourti. 
(4) S. finlaysoni. 
(5) S. germaini 
(6) See also a note on the variability of the colour of S. finlaysoni by Prof. A. 
Milne Edwards. [Bull. Soc. Philom. (7) I, p. 16, 1877]. 
(1) J. A. S. B., XLVII, p. 156, 1878. 
(8) See Thomas, P. Z. S., 1886, p. 71. 
