A FOURTH COLLECTION OF SIAMESE MAMMALS. 57 
Hands and wrists buffy white, feet buffy on the digits and half-way 
towards the ankles. Tail cinnamon tinged with brown, paler below at 
the base. Mamme 3-3=6. 
Adult male: Like the preceding but much duller; the upper 
parts washed with pale cinnamon-buff instead of orange-cinnamon ; 
muzzle greyish buff; limbs and membranes blackish brown instead of 
dusky drab. Hands and feet darker, the white coi fined to the edges 
and the digits. Tail dull brown above, darkest at the end; brown and 
buff below. 
Immature female: Like the male but much darker (as in all 
young flying squirrels apparently) owing to the fewer buffy tips to the 
hairs ; the grey bases on the belly are more pronounced and the feet 
are much darker throughout. 
Mr. Thomas has also described (f. c. s., p, 27) another race, 
H. p. probus, from Mt. Popa, Central Burma, from which H. p. laotum 
is stated to differ in having the hands and feet less extensively white 
and the under parts less pure white and more mixed with slaty: it is 
also larger. The adult female so closely accords in these respects that 
one would be inclined to refer it to the Burmese form, if it had not 
been obtained so near the type locality of H. p. laotum, with which 
race the male from Me Taw agrees, 
Measurements of H. p. phayrei and H. p. laotwm in millimetres. 
No. F oe 14) BETTE Qi 26142 2613 ¢ | 2651 imm. 
Head and body bi bes 166 167 165 _— 
| aris : ae mus 158 151 150 = 
Hind foot ees eM EE Se 31 35 83.5 32 
aa’ <2 32, ye4 en ee 24, ao 25 = 
Skull ... ds tee za 
greatest length i wwe 41.3 42 41.5 ve 
condylo- bagilar length jae 34.7 35 a7: *| = 
basilar length we he 31.9 32.1 Ol = 
palatilar length  ...  ...| 18 18.1 18.5 17 
diastema ga 8.8 8.5 89 | 7.1 
upper molar row (alveoli) 8.7 59 | 8.6 9 
nasals og- DS G9), AX G 12x 6.4 | 10.3 x 5.8 
interorbital Saal. a 9.4 8.9 8.5 8.9 
zygomatic breadth .,, at 95.5 25 25 22.2 
mastoid breadth oe ca 19 20 18.7 — 
VOL, III, NO. II, 1918, 
