NO. 197G. TREESHREWS: FA2IILY TUPAIIDM—LYOS. 61 



that may be taken as the type of the species, has been exposed to the 

 light too long to be of value in determining whether it was a typical 

 T. hclangeri or approached T. chinensis. The f::cts appear to be that 

 lelangeri is the oldest name for the continental Tupaias that are not 

 ferruginea. From the description and supposed type-specimen, the 

 name helangeri might be applied to what I call in this paper helangeri 

 or chinensis, but at the type-locality of helangeri occur treeshrews 

 certainly belonging to what is here called helangeri; and chinensis has 

 been proposed by Anderson for uniformly grizzled grayish treeshrews 

 farther northward, thus leaving helangeri perfectly available for the 

 Tenasserim animal. 



The relationship between Twpaia helangeri and T. chinensis seems 

 intimate, and it would not be surprising if the two forms were found 

 to intergrade, helangeri being confined to the coastal region and 

 chinensis to the higher region of the interior. As it is, many of the 

 specimens examined are not typical of helangeri, among them British 

 Museum, Reg. No. 7.7.20.7 Rangoon; Reg. No. 85.8.1.82 Meetan; 

 Reg. Nos. 82.11.18.1, 85.8.1.86 Thaungyeen Valley, and Reg. No. 

 85.8.1.90 Bankasun, and the two Kokareet specimens in Genoa. 

 Before determinmg this point it would be desirable to obtain good 

 series of skins from the mouths of the Irawadi and Salwen Rivers 

 and at various points from along the river until the upper courses in 

 or near Yunnan are reached. 



The specimens in the United States National Museum from the 

 various islands of the Mergui Archipelago are fairly uniform in most 

 of their characters. A few differences in size or color are indicated in 

 some of them, but it does not appear possible to divide them into 

 geographic races, or to separate the island forms as a whole from those 

 of the adjacent mainland. On the mainland, Bentink, St. Luke, St. 

 Matthew, the skms appear brighter on the lower back, and on Domel, 

 Sullivan, Clara, James, and Kissering, the skms are slightly duller on 

 the lower back, and perhaps darker anteriorly. A few slight differ- 

 ences in size are revealed by examining the table of measurements. 

 All the St. Matthew specimens have a maxillary toothrow of 19 mm. 

 or over, while on James Island it is 18.5 or under, and in a single 

 specimen from St. Luke Island it is only 17.5. But these extremes 

 are all bridged over by intermediate specimens from other islands or 

 from the mainland. 



A treeshrew probably related to Twpaia helangeri occurs on 

 Preparis Island, between the Andamans and Pegu. A specimen 

 from there is recorded by Anderson in the Catalogue of Mammals of 

 the Indian Museum, Calcutta, part 1, page 155, listed as "hh." It is 

 said to be darker than the mainland specimens, and undoubtedly 

 represents an undescribed form. 



