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PROCEEDINGS OF THE NATIONAL MUSEUM. 
VOL, X X X 11. 
resembles A. zygomutlem from Palo Aor in its small lachrymal, but 
lacks the heavy zygoma and the step-likc projection on its infe¬ 
rior border. Caudal bristles shorter than in either .,4. macrourus or 
A. zygomaiicm, and with the single (in the other species these are 
usually three to five on a bristle) expansion relatively narrower and 
longer. The bristles, however, have a worn appearance, which might 
account for this difference. 
Color . — The color of Atherurus terutauB so closely resembles that, of 
A, zygomaticus that no detailed description is necessary. 
Skull and teeth. —In general, similar to those of Atherurus macro- 
uvm, hut distinctly smaller, rostrum and nasals relatively shorter, 
constriction between the orbits more pronounced, depression on top 
of skull greater; lachrymal bone much smaller, scarcely any of it 
appearing on the dorsal aspect of the skull; in this respect resembling 
the skull of A. zygomaiicuSf zygomata of the same form as in A. ma- 
crmtrmx audital bullte, smaller. Teeth of same form as in A. macro- 
arm, but smaller. 
Measurements .—See table* page 593. Cranial measurements of the 
type: Greatest length, 93.2 mm. (94.3, 99);" basal length, 82.2 (82.6, 
87.4); basilar length, 76.1 (75,6, 80,5); oondyio-basal length, 87.8 (81*, 
1*4.2); palatal length, -hi.7 (45.5, 47.6); greatest length of nasal, 22 
(25.3, 26.3); zygomatic breadth, 45,8 (45.3, 47.5); least interorbital 
breadth, 24.5 (20.1. 28.4); maxillary tooth row (alveoli), 15.7 (17.1, 
17.2); mandibular toothrow (alveoli), 17.3 (17.9, 18.8), 
SpecimetiH exam med. -— On e, 11 1 e ty pe , 
Remark . — Although but one specimen of Atherurus terutaiw is 
known, its peculiarities are so well marked that its specific distinctness 
from A. macrouras and A. zygomaticus can not be doubted. It pos¬ 
sesses the peculiar lachrymal bones of A. zygomaticus^ but its zygo¬ 
mata are exactly as they are in A* macro arm from the mainland. 
TRICHYS Gunther. 
1870. Trichps Gunther, Proc. Zool. Boe. London, 1876, p. 739, lip. 2; p. 740. %, 
*2<i t p. 741 and pi. l.yxi. 
Type. — Trichys lipura, from Borneo. 
Specie*. — Trickyx famiculata (Shaw), from Malacca; T. Upara Gun¬ 
ther, from Borneo; T. macrolw Miller, from Sumatra. 
Diagnostic character *.—A small porcupine externally resembling 
Atherunts but with a relatively longer tail, each scale of which is sub¬ 
tended by a single hair and with the brush at end of tail composed of flat, 
g roo v ed bristl es, w i t h pa r a I lei sides, (PI ate LVII, fig. 4,) Skull small, 
different from that of Atherurus in possessing distinct postorbital 
" Measurement in parentheses art! those of the type of Alherurm zyg&matkus Miller, 
from Pulo Aor, and of an adult female, Cat. No, 84433, U.S.N.M., of A. maerount* t 
from Trong, Lower Siam. 
