122 



Skull : |[,a-eatest length, 59 ; condylo -basal leiigtli, 55 ; greatest 

 breadth, 28.8 ; palatal length, 32 ; length of bvillae, 12 mm. ; front oij'^ 

 to back of hi^, 10.5. 



Habitat. — Rhio Archipelago, from Kundur on the west to Bintang 

 on the east (t;ype from Karimon). 



Type.— Adult female. B. M. No. 9, 4, 1, 238. Original number 

 1366. Collected 13th August, 1908. 



This Rhio form of Jeo is rather larger and lighter coloured with 

 more strongly buffy belly, but the variation of the belly colour 

 quite overlaps the Singapore series, v^^hile the lengths of hind feet also 

 intergrade. 



The following are some hind foot measurements of specimens from 

 different islands : 



Karimon ... 42,42.5,43,43,45 



Average of 17 specimens, 42.5 



*0 'v 



Kundur ... 42, 42, 42, 43, 43.5 / 



Batam . ... 41, 42, 42, 42.5, 43 

 Bintang ... 41.5, 42 J 



45. MUS "RATTUS," Linn. 



(?1340, 1341 (hum.), 1345, 1350, 1359, 1360, 1361, 1376, 1378, 1382, 1393, 



1394,1398, 1401; ?J335, 1^46, 1.358, 1362, 1373, 1374, 1377, 1379, 



1380, 1384, 1386, 1392, 1400. Pemcral, Kaninon Island, Illiio 



Ai'chipelago. 

 c?1313, 1314, 1327; $1316, 1319, 1320, 1321, 1323, 1326. Merah Island, 



near Karimon Island. 

 J 1416 ; ? 1413, 1422, 1424. Tanjong Balci, Karimon Island. 

 <?1587, 1588, 1590, 1591, 1592; $ 1562, 1567. Lckop, Karimon Island. 

 <?1601, 1602, 1603, 1604, 1605, 1622, 1659; $1608, 1609, 1610, 1655, 1660, 



1661. Monos, Kainmon Island. 

 <?1676, 1703, 1704, 1727, 1731; ? 1696, 1698, 1700, 1705. Little Karimon 



Island. 

 c?1430, 1463, 1465, 150S, 1513; $ 1431, 1432, 1447, 1453, 1464, 1467, 1487; 



<? 1514, 1515, 1.530. Bliah, Kundur Island, Rhio Archipelago. 

 (?1535, 1538; ¥ 1537, 1539, 1541. Talang Island, Rhio Archipelago. 

 c?1162, 1181, 1186, 1191, 1239, 1242;- $ 1169, 1185, 1189, 1237, 1241. Tan- 



jong Surat, S.-E. Johore. 

 S 826. Leman Point, E. Johore. 

 (? 838, 839, 841. Sibu Island, E. Johore. 

 ? 1269. Si Karang, S.-E. Johore. 



[With the exception of the series from Tan jong Surat and Si 

 Karang, S.-E. Johore, which can be picked out at a glance as belonging 

 to the form descriljed by Mr. Bonhote as Mus griseiv enter, these rats, 

 though broadly referable to the true " rattus " group, impressed us as 

 showing very great variation inter se. Those from Little Karimon are 

 certainly different on cursory inspection from any of the many 

 hundreds of the group from the Malay Peninsula and the vicinity that 

 have passed through our hands.— H. C. R. and C. B. K.] 



