148 
MALAYSIAN BEARDED PIGS. 
Third lower molar with two cross ridges and a terminal 
heel. . . . Sus oi.” 
Of still larger series of Sumatran and Bornean material Lvon 
wrote 3 “ The specimens 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 oi and Sus barbatus is the size and the 
shape of the last lower molars. This tooth averages longer in the 
Bornean pigs and in the majority of the specimens shows three 
distinct cross ridges and a terminal heel, while in the Sumatran 
Sus oi 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 oi. All 
the pigs of this group recently taken by Doctor Abbott on Sumatra 
or the adjacent islands are distinctly smaller than is the type of 
Sus oi.” 
My Bornean series consists of five adult skulls with mandibles 
and one mandible from the southern half of Sarawak (one with 
exceedingly worn teeth, one just adult) which should all be Sus 
barbatus : and my Sumatran set 4 of a topotype of Sus oi and two 
adult skulls with mandibles and one skull only (with very worn 
teeth) from Tanjong Batu, south east of Great Durian Id., Rio 
Archipelago, which should also be Sus oi. To these may be added 
Miller's description combined with his figures of skulls and teeth 
which are very large and clear. 
The Tanjong Batu examples agree with the topotype and the 
figures and descriptions of Sus oi — and so do three of the six 
Bornean specimens ! 
Of the remaining Bornean specimens two clearly have the 
mandibular teeth of barbatus of Miller, and another with the de- 
tail worn away has the teeth nearly as long; but of the last all 
one can say of its exceedingly worn teeth is that the posterior lower 
molar is very large and apparently has the form of barbatus though 
it is abnormal, ending with a pronounced outward curving spur, 
whereas the last lower molar in all the others is rounded. Its 
posterior upper molar is truncated and terminates squarely: the 
remainder agree with each other in having the end of the last upper 
molar rounded. 
3 Proc. U. S. Nat. Mus. XXXIY. 1908, p 626. 
4 Lent by Raffles Museum, Singapore. 
Jour. Straits Branch 
