42 



NILS GYLDENSTOLPE, THE SVVEDISH ZOOLOGICAL EXPEDITIONS TO S1AM. 



stated by Miller in the original description, but there is no white spöt between the eyes 

 except in one of the specimens, obtained on the 21st of January and even in this specimen 

 it is ill-defined. 



Skull measurements 



Qreatest length j 40,2 mm. 



Zygomatic width 17,0 



Length of incisive foramina 5,6 



Length of palate from henselion 16,5 



Breadth of palate between first molars . . . 3,6 



Length of diastema 10,0 



Length of nasals mesially 15,8 



Breadth of nasals anteriorly 4,0 



Breadth of nasals posteriorly 1 ,6 » 



• Least interorbital breadth 6,5 



Width of brain case 15,7 



Length of maxillary toothrow 6,0 



5,6 mm. 



5,7 mm. 



15,2 



15,2 » 



3,5 



3,6 > 



9,6 



9,6 



14,4 



15,5 » 



4,0 



4,0 



1,4 



1,6 



6,0 



6,6 



6,2 



6.1 



Rattus surifer. Miller. 



Proc. Biol. Soc. Washington. Vol. 13. 1900 p. 148. 



§ Hue Sai, Siamese Malaya, 15 /i 1915. — Nose to vent = 175 mm.; tail = 165 mm.; hiudfoot = 

 38 mm. — $ Hui Sai 17 /i 1915. — Noseto vent = 190 mm.; tail = 178 mm.; hindfoot = 38 mm. — J 1 Hue 

 Sai 16 /i 1915. — Nose to vent = 192 mm.; tail = 195 mm.; hindfoot = 37 mm. — $ Hue Sai l8 /, 1915. 

 — Nose to vent = 185 mm.; tail = 150 mm.; hindfoot 38 mm. — $ Hue Sai 17 /i 1915. — Nose to vent = 

 165 mm.; tail = 177 mm.; hindfoot = 38 mm. — J 1 Hue Sai 16 /i 1915. — Nose to vent = 225 mm.; tail = 

 190 mm.; hindfoot = 38 mm. — $ Hue Sai ic /i 1915. — Nose to vent =-198 mm.; hindfoot = 37 mm. — 

 $ Hue Sai 17 /i 1915. — Nose to vent = 165 mm.; tail = 173 mm ; hindfoot = 37 mm. — <$ Hue Sai 16 /i 

 1915. — Nose to vent = 220 mm.; tail == 225 mm.; hindfoot = 37 mm. — J 1 Hue Sai 15 /i 1915. — Nose to 

 vent = 190 mm.; tail = 188 mm.; hindfot = 36 ram. — <$ Hat Sanuk, Siamese Malaya, 2 % 1915. — Nose 

 to vent = 190 mm.; tail = 195 mm.; hindfoot = 38 mm. — $ Hat Sanuk 26 /i 1915. — Nose to vent = 

 178 mm.; tail == 160 mm.; hindfoot = 37 mm. - - $ Hat Sanuk 2R /i 1915 (imm.) — Nose to vent == 135 mm.; 



tail == 163 mm.; hindfoot == 35 mm. — $ Hat Sanuk 31 /i 1915 (imm.) 

 = 155 mm.; hindfoot = 36 mm. — <$ Koon Tan. Northern Siarn, "/o 1914. 

 tail =-150 mm.; hindfoot = 36 mm. 



Nose to vent =148 mm.: tail 

 Nose to vent = 175 mm.: 



This fine Rat was very common in the dense jungles on the boundary between Siarn 

 and Tenasserini and a large series was obtained. It is easily trapped and seems to live 

 near rivers and creeks. The whole series is very uniform as to the colouration of the fur. 



The specimen obtained at Koon Tan in Northern Siarn was shot in a dense evergreen 

 forest among boulders of rocks. It is exactly similar to the other specimens from the 

 Siamese Malaya, both as to size and colour. 



It adds a considerable distance to the distributional area of this species in a 

 northern direction. 



