626 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
mile from the river banks. The timber tongkans (junks) ascend the Kateman 
for about 18 or 20 miles. Besides the animals obtained, I saw pigs and a black 
leopard. Tigers also exist, but no elephants or rhinoceroses.—W. L. Abbott. 
SYSTEMATIC LIST OF SPECIES. 
SUS VITTATUS Miiller and Schlegel. 
1839-1844. Sus vittatus MULLER and ScHLEGEL, Verhandel. Natuur, 
seschied. Nederl. Bezitt. Zool., p. 172, pls xxx, XXXII. 
1889. Sus vittatus, JENTINK, Notes Leyden Museum, XI, p. 25. 
1905. Sus vittatus, SCHNEIDER, Zool. Jahrb. Syst., XXIII, p. 127. 
1906. Sus vittatws, Mitier, Proc. U. S. Nat. Mus., XXX, p. 746, June 18, 
1906. 
Three specimens from Aru Bay, one from Pulo Rupat, two from 
Pulo Payong in Salat Rupat, two from the Siak region, and two from | 
Pulo Penjalei, at the mouth of the Kampar River. Those from 
Pulos Payong and Penjalei are very small, but it is doubtful if this 
is more than individual variation. 
or measurements of the adults, see table, page 627. 
SUS OI Miller. 
1902. Sus oi MinuErR, Proc. Biol. Soe. Washington, XV, p. 51, March 5, 1902. 
1905. Sus barbatus, SCHNEIDER, Zool. Jahrb. Syst., XXIII, p. 128. 
1906. Sus oi, MituEeR, Proce. U. S. Nat. Mus., XXX, p. 741, June 13, 1906. 
During his latest trip into eastern Sumatra, Doctor Abbott secured 
eight additional specimens of this large pig from the mainland or 
the adjoining islands. These specimens, together with material re- 
cently collected by him in western Borneo,* indicate that the members 
of the Sus barbatus group of pigs are somewhat more variable than 
was at first supposed. The characters pointed out by Mr. Miller, 
however, appear as a rule to hold good. The most reliable character 
for distinguishing between Sus o¢ and Sus barbatus is the size and 
shape of the last lower molars. ‘This tooth averages longer in the 
Bornean pigs and in the majority of the specimens shows. three dis- 
tinct cross ridges and a terminal heel, while in the Sumatran Sws o7¢ 
most specimens have this tooth shorter, with only two cross ridges 
and a terminal heel, or sometimes what appears like three cross ridges 
and no heel. As for actual size of the skulls, the largest in the U. S. 
National Museum comes from Borneo (Cat. No. 142351, upper length 
487 mm.). It does not, however, reach the extreme length (505 mm.) 
given by Mr. Miller ® for Sus oz. All the pigs of this group recently 
taken by Doctor Abbott on Sumatra or the adjacent islands are dis- 
tinetly smaller than is the type of Sus o7. 
For measurements see table, page 627. 
@Vyon, Proc. U. S. Nat. Mus., XOX:XIII, p. 551, December 24, 1907. Part of 
the specimens only. 
6 Proc. U. S. Nat. Mus., XXX, 1906, p. 741. 
