KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 57. N:0 2- 35 



breadth of nasals anteriorly = 6,5 (6,3); breadth of nasals posteriorly = 4,o (3,3); breadth 

 between meatus auditiva = 20,6 (21,o); least interorbital breadth = 16,o (16,3); least 

 postorbital breadth = 18,2 (17, s); diastema = 10,8 (10,o); length of palate from hen- 

 selion = 21,5 (21,6); maxillary toothrow = 10,2 (10,3) mm. 



I have had the pleasure of naming this fine and characteristic squirrel after the K. 

 Siamese Consul in Stockholm, Mr. Helge Ax:son Johnson, who has shown such a great 

 interest about the scientific exploration of Siarn. 



Sciurus epomophorus davisoni. Bonh. 



Ann. Mag. Nat. Hist. ser. 7. Vol. 7. 1901 p. 273. 



$ Koli Lak 20 /ii 1914. — Nose to vent = 202 mm.: tail = 229 mm. — Hindfoot (measured in skin) 



= 49 mm. 



This species was fairly common at the neighbourhood of Koh Lak in the Siamese 

 Malaya, but it was never met with among the mountains 011 the boundary to Tenas- 

 serim. It seems to be exclusively confined to the low-lying country and was most com- 

 mon in kampong land and especially near towns and villages. 



The specimen obtained has two rufous buff spöts on the lower surface of the body 

 opposite the thighs. The yellowish spöt on the sides of the neck, which is a point of cha- 

 racteristic to this species, is, however, ill-defined and not very obvious. 



An allied form has been described by Robinson & Wroughton under the name 

 of Sciurus epomophorus milleri based on specimens from Träng in the Siamese Malay 

 States. In this form the flank- and neck patches are distinctly marked, though they 

 are paler than in typical Sciurus epomophorus. 



Sciurus epomophorus davisoni which inhabits Burma to the south of Tenasserim 

 is very similar to typical Sciurus epomophorus Bonh., but it may always be distinguished 

 from that species, because the rufous patch on the neck is replaced by a similar patch 

 of a yellowish tinge; the lateral lines are almost invisible and generally replaced by two 

 påle rufous spöts 011 the under parts of the body just opposite the thighs. In some spe- 

 cimens, however, there is a trace of rufous at the base of the tail too. 



Skull measurements : 



Greatest length: 55, 1; condylus to gnathion: 49, 1; baaicranial length: 46,2; zy- 

 gomatic width: 31,3; width of brain case at the root of zygomata: 23,7; length of nasals 

 mesially: 16,2; breadth of nasals anteriorly: 6,9; breadth of nasals posteriorly: 4,o; 

 length between meatus auditiva: 22, 1; least interorbital width: 18,7; least postorbital 

 width: 18,2; width between tips of postorbital processus: 27, 5; diastema: ll,o; length of 

 upper molar series: 10,8; length of palate to henselion: 22,4 mm. 



Sciurus atrodorsalis. Gray. 



c? Koh Lak u /is 1914. — $ Koh Lak */ ls 1914. — $ Koh Lak 26 /n 1914. — 2 Koh Lak 19 /i 1915. 

 — ef Hue Sai l7 /i 1915. 



This species was very common at the neighbourhood of Koh Lak in the Siamese 

 Malaya, where it mostly occurred outside the villages. Only one specimen was obtained 

 among the mountains on the börder to Tenasserim. 



