NOTES ON MALA YAN PORCUPINES— LYON. 587 



ATHERURUS ZYGOMATICUS Miller. ^ 



1903. Atherura zy(/(imatica Miller, Smithsonian INIisceil. Coll., XLV, November 

 6, 1903, p. 42, pi. II, fig. 4. Type-locality: Pulo Aor, off roast of Johore. 



Distriht/tion. — Known onl}' from Pulo Aor, off coast of Johore. 



Tf/j>e.—Adix]t female, sidn and skull, Cat. No. 112429, U.8.N.M., 

 collected on Pulo Aor, off' coast of Johore, June 6, 1901, by Dr. W. L. 

 Abbott, Original No. 1009. 



Diagnostic character-^. — Like Atherurus ntacrourus^ but color 

 darker, and zygoma shorter and deeper, under side of malar bone with 

 a conspicuous tooth -like process directed backward, lachrymal l)one 

 much smaller, scarcely appearing on dorsal aspect of skull. 



Color. — Very similar to that of Athervrvs. macrourux., but slightly 

 darker, especially along the sides, due to the light area of the spines 

 1km ng less in evidence. 



Skull mid t-eeth. — In general, the skull is very similar to that of 

 Atherurus macrourus of the Malay Peninsula, but in size it is some- 

 what smaller and differs conspicuously in regard to the lachrymal 

 bones and the zygomata. 



In Atherura macroura the lachrymal is full_v 8 mm. in length belosv the rim of the 

 orbit, while above it extends forward as a triangle of bone at least 5 mm. long, and 

 is a noticeable feature of the dorsal aspect of the skull. In A. zygomutica its length 

 below rim of orbit is usually about 5 mm., * * * while the forward extension is 

 often obsolete and never large enough to be more than barely visible when the skull is 

 viewed from above. Zygoma shorter than in Atherura macroura, the jugal deeper in 

 pn)i)ortion to its length, more abruptly concaved above, and its lower contour 

 invariably * * * broken by a strongly developed concavity beneath posterior 

 jugal suture, this concavity terminating anteriorly on the posterior upper surface of 

 a well-marked tooth-like projection.'^' 



Jleasureuients. — For a comparison of the cranial measurements of 

 the type, with the type oi Atherurus terutaus and with an adult female 

 from Trong, Lower Siam, see page 588. For measurements of the 

 series, see table, page 593. 



Specimens examined. — Seven; all from Pulo Aor. 



ATHERURUS TERUTAUS, new species. 



Type.—^Vm and skull of adult male, Cat. No. 123971, U.S.N.M., 

 collected on Pulo Terutau (also written Trotau and Trotto), about 15 

 geographical miles west of the Maiay Peninsula, where the one hun- 

 dredth meridian east of (xreenwich cuts the west coast of the Malay 

 Peninsula, April 10, 1904, by Dr. W. L. Abbott. Original No. 3223. 



Diagnostic characters. — Like Atherurus aufcrourus of the Malay 

 Peninsula, but smaller, with shorter tail; lachrymal bone much 

 smaller, scarcely appearing on the dorsal aspect of the skull. It 



f'^NIiller, Smithsonian Miscell. Coll., XLV, p. 42, November 6, 1903, and esi^ecially 

 Plate II, figs. 4 and 5, where the above characters are well shown. 



