No. 1626. MAMMALS FROM EASTERN SUMATRA—LYON. 643 
parts of Sciwrus tenuis. These small pray squirrels fall into two 
groups so far as the clear white of the underparts is concerned. ‘The 
following species have the hairs of the underparts white or cream- 
white throughout: Sciwrus lowii (Borneo, Sumatra), lingungensis 
(Pulo Lingung, Natuna Islands), piniensis (Pulo Pinie, Batu Is- 
lands), and balw (Tana Bala, Batu Islands). In the other series of 
species the hairs of the underparts have gray or slaty bases and 
whitish tips. They are: Scturus tenuis (Malay Peninsula, Sumatra), 
tenuis surdus (Malay Peninsula), parvus (Borneo), mansalaris 
(Pulo Mansalar, west of Sumatra), bancarus (Bankaru, Banjak 
Islands), pumilus (Pagi Islands), and procerus (Borneo). 
Measurements, head and body, 114 mm.; tail, defective; hind foot, 
77; greatest length of skull, 31.8; ASD NEE breadth, 18.5; interor- 
inital constriction, 10.4. 
Measurements of Sciurus tenwis from eastern Sumatra, 
Sis (2 is |S Ie, 
S| 2 is. Seles lee 
- A | 8 |25| 83 | <8 |ee 
Name. Locality. are Sex. eb [SE ) ee | es lee 
ber a | Oo lea | G2 | a8 | ees 
| | ro Z |\O| Ro | me | og 
| Bo BB eS eS 
jan a 1 oS N 4 
| mm.|mm.| mm.) mm. | mm. | mm 
So VANOHS so cossal) HL IBRDYSsocecsee 12 Nas 143420F ie Malee sess son an aoe 14) j| Tules } BB |) B38 |} PROB Ieee 
IDXoyS es aa ee (aa thse CLO ye reek ene 143421 |... OKO, Mee Sars) = chee 1B) NOW | 38 lossase 22 12.5 
ID Ope ocean eee CORRES eck oak Ae 143423 | Female........-.-- 11483 |) II) | 8¥b 1) aia Ilescsae 12.4 
ID Ose cee Wee ape V0) ees Ra Se oes 1434249 ees Osta Sse eee! 135 | 105 ! 33.5) 36 21.5 | 11.8 
1 DO ys everett ei ee tea GO ane eae 143425 |_...- Goss S Jes UB | GO} BB occase [Reweis ch 12.8 
) Ge ee Fee yo CO ee ie oa 143426 |.._.- CORSE: ees 140 | 111 | 35 | 37.3 | 21.7 | 12.8 
IDX Gen ots beer a GOR ee ene 1434270 |eeee One eee Té(Q) } Tall) B38 lscecoe 22.4 | 12.8 
Does: ae | Besitan River......... 148422 | Male.............. 140 | 120 | 35.5) 387 PAS} || 19, 55 
ID) OM ey eles CLO ee eres ee 143428 | Female........--- IBY || &B3 | B¥O" |) Base) PRES WBE 
DOs: eSalatpRupstaeesen cnn 143429 | Male............. 135 | 110 | 33.5] 36 OP} | T8X83 
DOsccoosael Mie RINGS soos dcoduode 144195 |..... GOs Stenee: 138 | 109 | 35 | 36 20.4 | 12 
1D Ones. een eee OU) SE Ss A i ea 144198 |..... CObvore seats 140 | 100 | 35 | 35.4 | 21.7 | 12.5 
IDS Ree Sungei Mandau...-....:| 144196 | Female....... sco Jat) | Os | BB BOO | 9) | 12) 
DD) On ears OK0) SOS Se ee AAS Tie eee COM ee 135 | 105 | 34 ate Of |) PAL) |} Ie 
DOM AKOMP Cin Nees vee 144200 | Male.............. 138 | 107 | 37 | 36.5 | 21.2 | 12.2 
DO eS Little Siak River...-... 144193 | Female.........-. HAO} 3100) SB Wesscsclloccsodloooss 
DOs IgA s% Little Siak River, at | 144201 |../..do............ 145 90 | 35 34.9 | 21.3 | 12 
tee 
WOR ee ee Onnt ee: Ba aea es. 144202 |..... GOs i 128 | 97) 34 | 34 20 11.5 
IDO ses eee pes Litue Siak River......- 1442025 |PMialemseeeaes seas: 12S | GS || SH, |) BY! 20.5 | 11.6 
1DXoy ee ieee Kateman River.....-.-. 123119 }..... CLO S seen es 130 | 110 | 386 | 36.3} 21.5 | 11.8 
DOM seen |e On SSS eias 123120 | Female........... T1SK0) |) THO |} B48 No ecccdllsscocs 12 
IB) OSes eralisece COSA Eee ae WBIGAL Ht INNO s5. oabocehodcs 1480 | eee 34 38.2 | 22 13 
“ Collector’s measurements. f : 
b Measured by writer after soaking feet twenty-four hours in water. 
SCIURUS HIPPUROSUS Lyon. 
1905. Sciurus hippurus, SCHNEIDER, Zool. Jahrb. Syst., XXIII, p. 109. 
1907. Sciurus hippurosus Lyon, Smithsonian Miscell. Coll., L, Pt. 1, p. 26, 
April 8, 1907. 
One specimen from the Besitan River, Cat. No. 143399, U.S.N.M., 
adult male; head and body, 260 mm.; tail, 250; hind foot with claws, 
62; greatest length of skull, 57.8; zygomatic width, 34, | 
