A FOURTH COLLECTION OF SIAMESE MAMMALS. 55 
Tupaia clarissa was described as a full species but it appears to be 
merely an intermediate, but very interesting form completely connect- 
ing northern animals with southern ones and showing that all tupaias 
of this kind belong to races of one species, J’. glis (Diard) of Penang, 
and not to several distinct species. 
( For measurements see table postea ). 
9. Hylomys suillus siamensis. 
Hylomys siamensis, Kloss, Journ. N. H. S.-Siam, IT, p. 10 (1916). 
1 dad. Me Taw, N.W. of Raheng, W. Siam, 1,500 ft. [No. 2660/ 
CBK.]. Collected by Mr. K. G. Gairdner on 2 Feb. 1917. Orig. 
No. 352. 
1 dad. Sikawtur, N. W. of Raheng, 1,500 ft. (No. 2661/CBK. ]. 
Collected by Mr. K. G. Gairdner on 15 March 1917, Orig. No. 409. 
The second specimen of this rare insectivore exactly agrees in 
colour with the immature type ; the first is rather brighter above, being 
more ochraceous on the rump. The tail is pale beneath. 
Measurements :—Head and body, 188, 132; tail, —, 22; hind- 
foot, 28.5, 23; ear, 17, 15.5. 
Skulls :—Greatest length, 34.7, 34.9; condylo-basal length, 33.8, 
33.1; basal length, 31.4,—; palatal length, 18.5, 18; upper tooth 
row (alveoli), 18, 17.2; pt—m3 (alveoli), 8, 8.1; median nasal length, 
12.2, 12; interorbital constriction, 8, 8.6; zygomatic breadth, 18.9, 
18.8; length of mandible, 25, 25 mm. 
10. Petaurista lylei Bonnore. 
Kloss, Journ. N. H.S. Siam, II, p- 392 (1917); Gyldenstolpe, Kungl. 
Sv. Vet. Akad. Handl, 57, No. 2, p. 30 (1917). 4 
9d ad. from Sikawtur, N. W. of Raheng, W. Siam, 1,500 ft. 
[ Nos. 2652-3/CBK. ]. Collected by Mr.. K. G. Gairdner, 28 May 
1917. Orig. Nos. 452-8. 
1 ¢ ad. Pa Meang, Me Nga, N.N.E. of Lakon Lampang, North 
Siam, 2,000 ft. [ No. 2663/CBK.]. Messrs. Williamson and Smith’s 
collectors. 3 Nov. 1917. 
I have already given a description of this animal in the Journal; 
in two of the specimens the black behind the ears and on the limbs 
and tail is browner and less intense than in the others, and the under 
body of the Me Nga specimen is altogether paler, being whitish on the 
axillae, sides, abdomen and base of tail. 
VOL. III, NO. II, 1918. 
