138 PROCEEDINGS OF fUE NATIONAL MtlSEUM. vol.45. 



Borneo; T. t. hesara, lower Kapuas River, Borneo; T. t. sirhasse- 

 nensis, Sirliassen, Natuna Islands; T. t. hunose, Tambelan Islands, 

 and T. t. tuancus, Banjak Islands. 



Remarks. — Tana tana is distinguished from T. cervicalis by its 

 duller and less brilliant colors and less conspicuous black area on lower 

 back, from T. paitana by having the shoulder stripe bordered above 

 and below by general color of sides, and from the Linga species by 

 its greater size. The material for making a comparison of the 

 Sumatran and Bornean tanas is not entirely satisfactory. Good 

 Sumatran specimens are rather scarce, as an examination of the list 

 of specimens on page 140 will show. There is not one good fullylidult 

 modern stud}^ skin of Tana tana tana from the island that is its type- 

 locality. Probably the best material is in the United States National 

 Museum (represented by two specimens from Deli almost as far from 

 the exact type-locality, Bencoolen, as one can find) and in the Phila- 

 delphia Academy of Natural Sciences. One of the National Museum 

 specimens is in alcohol, the other a skin made from one in alcohol. 

 The colors of both of them are not beyond question, although appar- 

 ently unchanged. Their underparts are distinctly darker than the 

 anderparts of Bornean examples. Most of the Philadelphia skins 

 are immature, and none shows any tangible character by which to 

 distmguish them from Bornean skins. The skulls and teeth show no 

 distmguishing features between the Bornean and Sumatran speci- 

 mens. For the present at least the same subspecies of Tana tana 

 must be regarded as occurrmg in southern Borneo and Sumatra. In 

 Paris, Berlm, and London are a few specimens of Tana tana simply 

 labeled "Borneo." I have not mcluded them in the lists and measure- 

 ments of specimens, and have made no attempt to assign them to 

 any particular subspecies. Many of them are old and mounted. 

 A fair number of specimens of Tana tana exist m museums from 

 definite locaUties m Borneo, and while they show considerable indi- 

 vidual variation, yet as a whole they fall into two groups, those from 

 Sarawak behig brighter colored and those from southern Borneo 

 duller, with a large member of the dull form on the lower Kapuas 

 River. The brighter-colored specimens seem to be associated with 

 the mountams while all those from southern Borneo have been taken 

 m the lowlands. Future explorations may show that on Borneo 

 the bright colored form is an inhabitant of the higher regions of 

 that island and the duller form are inhabitants of the lowlands of the 

 coastal region. The present division into northern and southern 

 races may sunply be owing to the fact that the lowlands of southern 

 Borneo have been explored, mainly by Abbott and by Shortridge; 

 while in the north Hose worked in the higher altitudes. Our knowl- 

 edge of this species on both Sumatra and Borneo is very elementar}^ 

 at present. On SMiassen of the Natuna Islands is a well-marked 

 geographic race closely related to the lowland Bornean form. 



