60 PROCEEDINOS OF THE NATIONAL MUSEUM. vol.45. 



Clara, James, St. Luke, and St. Matthew of the Mergui Archipelago, 

 and probably other islands of the same group. See No. 2 on map 



on page 75. 



Diagnosis.— BiiieYS from T. glis ferruginea m generally lighter and 

 more grajash coloration and from T. chinensis in havuig a distinct 

 ochraceous wash over the rump and lower back; mammae, 3-3 = 6. 



(7oZor.— Upper parts of head, neck, anterior half of back and outer 

 side of forelegs a fine distinct grizzle of cream buff and blackish, the 

 buffy color slightly in excess; lower back, rump, base of tail, outer side 

 of hind legs a fine grizzle of ochraceous and blackish, the ochraceous 

 in excess; lower back distmctly different in color from upper back, 

 but the one imperceptibly mergmg into the other; tail above usually 

 intermediate in color between anterior and posterior back, but the 

 grizzlmg less distuact and with an excess of the darker color; under- 

 side of tail similar to upper, but lighter and more buffy, and the 

 grizzlmg less distmct; underparts, mcluding inner sides of legs, cream 

 color to buff yellow. 



SJcull and teeth. — The skull and teeth of Tupaia helangeri show no 

 pecularitics to distinguish them with certainty from those of related 

 species; the rostrum is relatively shorter than it is in T. glis ferruginea, 

 and the skull as a whole slightly smaller than it is in T. glis ferruginea, 

 and slightly larger than in T. chinensis. (Plate 8, fig. 2.) 



Measurements. — Usual measurements of adults: Head and body, 

 175 to 190 mm.; tail, 150 to 160; hind foot, 42 to 45; condylo-basal 

 length, 46 to 48; zygomatic width, 24 to 25; width of braincase, 18 

 to 19; maxillary tooth row, 18 to 19. For details of measurements, 

 see table, pages 62 and 63. 



Specimens examined. — Tenasserim and Pegu, 30, Mergui Archi- 

 pelago, 26, from the follo^ving islands: Bentink, 2; Domel, 4; Kis- 

 sering, 3; Sullivan, 2; Clara, 1; James, 8; St. Luke, 1; St. Mat- 

 thew, 5. 



Reinarlcs. — Tupaia helangeri as represented by specimens from the 

 Mergui Archipelago and the mainland opposite is a well marked form. 

 From the type-locality, however, specimens are less differentiated. 

 In the British Museum are two skins from Rangoon, one of which, 

 Reg. No. 6.4.5.3, is quite typical of the species as here described; the 

 other, Reg. No. 7.7.20.7, is scarcely ochraceous posteriorly and bears 

 considerable resemblance to T. chinensis. Both these skins were col- 

 lected in February of different years, and both are adult. It would 

 appear that T. helangeri is not as differentiated at the type-locality as 

 it is further southward along the coast. As origuially described 

 Tupaia helangeri does not appear to be different from T. chinensis. 

 In the old accounts mention is not made of the distinct ochraceous 

 wash over lower back, but as the species at that time was bemg sepa- 

 rated from T. ferruginea, this is not surprismg. The old specimen, 



