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



43 



Skull measurements 



ef 



O" 



c? 



Greatest length 46,1 mm. 



Condylobasal length 41,3 > 



Basicranial length — 



Zygomatic width 20,5 



Width of brain case 17,1 



Palatal length to henselion 18,1 



Diastema i 1,6 



Length of nasals mesially 17,7 



Breadth of nasals anteriorly 4,3 > 



Breadth of nasals posteriorly 2,0 



Least interorbital breadth 6,4 



Length of foramina incisiva [ 5,8 



Breadth of palate between m' .... 3,6 

 Maxillary toothrow 6,2 



46,0 



mm. 



— 



41,1 



mm. 



45,5 mm. 



41,5 mm 



42,2 







37,3 



" 



41,5 



36,8 » 



40,0 



» 



— 



34,4 



)> 



39,0 » 



34,3 » 



19,5 





19,2 mm. 



19,0 



•> 



19,7 



— 



16,8 





16,1 



16,2 





15,9 



15,8 



18,7 



» 



16,6 



17,1 



» 



17,8 



16,3 



11,5 





11,3 



10,6 





11,1 » 



10,2 



17,5 



» 



16,5 



15,0 





16,5 » 



15,9 



4,3 





3,7 



4,1 



» 



4,2 



3,7 » 



2,0 



• 



2,0 » 



2,0 



» 



1,5 



2,0 



6,9 





6,2 » 



6,8 



» 



7,1 



5,5 



6,2 





6,5 » 



6,2 



}> 



6,3 



5,8 



3,8 





3,8 » 



3,2 





3,7 » 



3,8 » 



6,5 





6,0 



6,2 





6,5 



6,2 



Rattus sp. 



£ Hue Sai, Siamese Malaya, 17 /i 1915. — Nose to vent = 108 mm.; tail = 105 mm. 



This specimen is too young to be properly identified but it certaiiily belongs to the 

 Rattus surifer-Grou-p. It does not, however, agree well with the two immature specimens 

 of this rat which were obtained at Hat Sanuk a few miles north of Hue Sai. 



The dimensions oj the skull are as follows: 



Greatest length = 32,o; condylus to gnathion = 28,o; length of palate from hen- 

 selion = 12,5; breadth of palate between m 1 = 2,o; diastema = 7,2; least interorbital 

 breadth = 5,7; length of foramina incisiva = 3,e; length of nasals mesially = 10,i; 

 breadth of nasals anteriorly == 3,6; breadth of nasals posteriorly = 1,2; maxillary tooth- 

 row = 5,o mm. 



Rattus rattus rufescens. Gray. 



$ Koon Tan, Northern Siarn, I7 /s 1914. — Nose to vent = 137 mm.; tail = 155 mm.; hindfoot = 

 31 mm. — J 1 Koon Tan 17 /s 1914. — Nose to vent = 175 mm.; tail = 194 mm.; hindfoot = 32 mm. — 

 $ Doi Par Sakeng, Northwestern Siarn, 3 % 1914. — Nose to vent = 160 mm.; tail = 190 mm.; hindfoot 

 = 32 mm. — 2 Doi Par Sakeng - 3 /i 1914. — Nose to vent = 177 mm.; tail = 200 mm.; hindfoot = 32 mm. 



The specimens obtained, which all were trapped in houses, are very similar as to 

 the general colouration of the fur. 



