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



41 



Two specimens shot in February have the outer light stripes very påle coloured 

 being almost creamy white. The two dorsal light stripes are very dark. The specimens 

 collected in May are very bright coloured and the outer stripes are quite broad and well- 

 defined being buff, though not quite as dark as the two dorsal stripes which are almost 

 rufous buff. The three dark stripes are nearly black some of the hairs having rufous tips 

 only. These stripes are much more prominent in these specimens than in other speci- 

 mens shot at the earlier months of the year, in which all the hairs have rufous tips. Speci- 

 mens collected in September also differ in certain particulars. The outer light stripes 

 are then of about the same colour as in the specimens obtained in May but on the lower 

 back they are almost white, which colour merges into the creamy buff colour on the middle 

 of the back. The dark stripes are also duller and the rufous tips to the hairs are very dis- 

 tinct and washed with olive. The general colouration is more greyish and the under- 

 parts paler. 



Skull measurements 



v 



Greatest length 34,5 mm. 



Condylus to gnathion 31,2 » 



Basicranial lengtli 28,8 



Zygomatic width 20,5 



Width of brain case at the root of zygomata 1 7,0 



Width betweentipsof postorbital processus 19,0 



Least interorbital width 12,5 



Least postorbital width 13,x 



Breadth between meatus auditiva ... 15,0 



Length of nasals mesially 9,5 » 



Breadth of nasals anteriorly 4,5 » 



Breadth of nasals posteriorl3' 2,6 



Diastema 7,0 



Length of palate to henselion 12,7 



Length of upper molar series 6,0 



31,0 mm. 



34,5 mm. 



32,1 



— 



34,1 mm. 



27,9 » 



30,6 



28,2 



29,2 mm. 



31,0 



26,0 



— 



26,1 



28,0 • 



— 



18,2 



21,1 



19,1 



— 



19,6 



15,0 



16,6 



15,7 » 



— 



16,2 



— 



18,4 



16,4 



— 



18,5 



11,3 



12,5 



11,5 



— 



12,7 



12,4 



14,1 » 



13,2 



— 



14,1 



14,0 



15,2 » 



14,3 



— 



14,9 > 



7,2 



9,2 » 



8,3 



8,0 



9,5 



4,3 » 



4,5 



4,0 . 



4,5 » 



4,5 



2,4 



2,5 



2,7 



2,6 



2,4 



5,9 



6,7 



6,2 



6,6 » 



7,0 > 



11,7 



12,7 . 



12,3 



12,3 



13,8 



5,7 



6,3 » 



5,9 > 



5,5 » 



5,5 » 



Rattus pellax. Miller. 



Proc. Biol. Soc. Wasli. Vol. 13. 1900 p. 147. 



2 Hat Sanuk, Siamese Malya, "/ 2 1915. — Nose to vent = 170 mm.; tail = 187 mm.; hindfoot = 37 mm. 

 2 Hat Sanuk 30 /i 1915. — Nose to vent = 156 mm.; tail = 157 mm.; hindfoot = 37 mm.; — 2 Hat Sanuk 

 30 /i 1915. — Nose to vent =-130 mm.; tail = 150 mm.; hindfoot = 36 mm.: — 2 Hat Sanuk 21 /s> 1915. — 

 \ r o<=e to vent = 160 mm.: tail = 170 mm.: hindfoot = 36 mm. 



This species occurred together with Rattus surijer Miller, in the evergreen jungles 

 on the boundary to Tenasserim, though apparently not as common as that species. In 

 all my specimens the nasals extend conspicuously behind the premaxillar branches as 



K. Sv. Vet, Akad Handl. Band 57. X:o 2. 



