NO. 1552. 
NOTES ON MALAY AX PORCUPINES—LYON. 
591 
Memurements. — See table, page 593. 
Specimen* examined. —Two, .skin and skull of nearly adult male from 
Mount Salikan, Borneo, and the skeleton of an adult from British 
North Borneo. 
TRICHYS MACROTIS Miller. 
1903. Trichys mncroEs Mih.br, Pro<‘. U. S, Nat. Mob., XNVI, j>. 469, February 
3, 1903, Type-locality: Tapanuli Bay, west coast of Sumatra. 
1905. Tricky# macrotu, VVihink, Natuurkurulig Tijdscbrift Nederlamlsch-lndie, 
LXV, p. 26S. 
Distribution.— Sumatra. 
Typ e. —Skin and skull of adult female, collected at Tapanuli Bay, 
west coast of Sumatra, February 20, 1002, by Dr. W. L. Abbott. 
Original No. 1555. 
Diagnostic character*. - Like Trichys lipura from Borneo, but with 
longer ears, more angled hamulars, and smaller lachrymal bone. 
Color,- The color of Tricky* macrotls differs in no way from that of 
T* It/mra. 
Earx.— V\w ears in Trichys uiuorvti* arc much longer than they are 
in T. lipura , and the tips broader and more rounded. Length of ear 
from meatus in the type of T. tnaci'Otis, 28 mm., in T lipura. Cat. No. 
83940, from Borneo, 18 mm. 
Skull. —The skull closely resembles that of Tricky* lipura, but the 
liamular process of the pterygoid hone has a more pronounced bend or 
angle on its inferior aspect, and the tip, instead of ending in a point 
barely in contact with the audital bulla, is considerably thickened and 
generally in contact with the bulla. The lachrymal bone is apparently 
much longer in the Bornean animal than in 2\ macrotis, although in 
many specimens of the latter species the sutures are so obliterated as 
to render it impossible to determine its exact size. Greatest length of 
the lachrymal bone in the two Bornean skulls, 8 and 9 mm. respec¬ 
tively, in four Sumatran skulls, 4 to 5.5 mm. 
Measurements. — See table page 593. 
Specimens examined .— Seven, 5 from Tapanuli Bay and 2 from Aru 
Bay, Sumatra. 
RELATIONSHIPS OF THE FOUR GENERA OF MALAYAN PORCUPINES. 
The most primitive and unrelated to the others of the Malayan por¬ 
cupines is the genus Tricky Externally Tricky* and Atherurw are 
much alike, but the terminal tail bristles of Tricky# are peculiar and 
bear no distinct relation to those of Athn'urns or to the other genera. 
Both Tricky* and Atlterurus have rooted Kohl's, while the molars in 
the other two genera are rootless. Osteologically Trichys shows many 
peculiarities not possessed by the other genera, such as the general¬ 
ized form of the skull, large number of dorsal vertebra? and narrowed 
Proe, N, M. vol. xxxii—07—38 
