NO. 1976. TREESHREW8: FAMILY TUPAIID^—LYON. 91 



Shdl and teeth. — These are of the same general form as they are in 

 Tupaia splendid ala, but larger throughout. The incisive foramina 

 are rather large and less slit-like and the bullae somewhat larger 

 than in the case of T. glis ferruginea. (Plate 10, fig. 9.) 



Measurements. — Type: Head and body, 200 mm.; tail, 145; hind 

 foot, 46; condylo-basal length, 49; zygomatic width, 25.5; width of 

 brain case, 19.5; maxillary tooth row, 19. The measurements of the 

 type are not materially departed from in a series of eight individuals, 

 for measurements of which see table, page 93. 



Remarks. — Tupaia castanea is a very distinct form; from T. splen- 

 didula it is at once distmguished by its larger size, equaling T. glis 

 ferruginea, and from T. glis ferruginea by its splendidula style of 

 coloring. Schneider's* record from the Indragiri, Sumatra was per- 

 fectly correct so far as the group is concerned, but his specimens are 

 now identified as Tupaia siaca. 



Specimens examined. — Eight, all from Pulo Bintang. 



TUPAIA SIACA Lyon. 



1908. Tupaia siaca Lyon, Proc. U. S. Nat. Mue., vol. 34, p. 661, September 14, 

 1908. 



Type-locality. — Little Siak River, lowlands of eastern Sumatra. 



Type-specimen. — In United States National Museum, Cat. No. 

 144205, skm and skull of adult female collected along the Little Siak 

 River, Sumatra, November 4, 1906, by Dr. W. L. Abbott; origuial 

 number, 4856; in good condition. 



Geographic distrihution.— Known only from the Little Siak and 

 Indragiri River regions, probably occurring in the mtervening region, 

 and for a moderate distance beyond, on either side. See No. 8 on 

 map on page 75. 



Diagnosis. — Very similar to Tupaia castanea, but underparts and 

 inner side of legs buff to ochraceous buff, instead of ochraceous to 

 ochraceous rufous; hairs of tail, seen above more distinctly annulated, 

 but seen below without annulations except beyond middle of hairs; 

 color of upper parts not quite so dark and rich as m T. castanea, 

 especiaflly in the region of the neck and shoulders, which are lighter 

 and brighter, and more grizzled than in T. castanea; mammae, 2-2 =4. 



Color. — Tupaia siaca is m general very sunilar in color to T. cas- 

 tanea, and the differences have been sufficiently pointed out under 

 the diagnosis, so that no detailed description is necessary. 



Skull and teeth. — The skull and teeth of Tupaia siaca are essentially 

 like those of T. castanea. (Plate 10, fig. 8.) 



Measurements. — Type: Head and body, 205 mm.; tail, 175; hind 

 foot, 47; condylo-basal length, 50.5; zygomatic width, 25.5; width of 

 brain case, 19.5; maxillary tooth row, 19. The tail of the type is from 

 10 to 15 mm. longer than is the case with most of the adult specimens 



J Zool. Jahrb., vol. 23, p. 87, 1905. 



