NO. 1106. NOTES ON MALA YAN PIGS—MJLI.FJL 7.J:9 



SUS RHIONIS, new species, 

 riates LX, LXI, and LXIV. 



Type.—Yoving adult male (skin and .skull), No. 122928, U.S.N. M. 

 Collected on Pulo Ungar, Rhio Archipelago, June 20, 1903, by Dr. 

 W. L. Abbott. Original number, 2555. 



CharacteTx. — Like 8ux vlttdtm, but with distinctly narrower skull, 

 the constriction of the parietals so great that the least width of brain- 

 case on upper surface is in adults alwa3^s noticeably less than width of 

 both nasals together at posterior extremit}^ of priniaxillaries (Plate 

 LX, fig. 2; plate LXI, fig. 2). Teeth as in Sus vittatufi. 



Measurements. — For measurements see table, pages 755 and 756. 



Specimens examined. — Twelve, from the following islands in the 

 Rhio Archipelago: Pulo Ungar, 9 (6 skins); Pulo Sugi Bawa, 2 (1 skin); 

 Great Karimon, 1. 



RemarJi-s:. — .The pigs from the Rhio Archipelago show an exaggera- 

 tion of the slenderness of skull that characterizes Susvittatus. This is 

 accompanied by a very marked narrowing of the parietal constriction. 

 In two skulls of adult female Sus vittatus (Nos. 113151 and 141028, 

 U.S.N.M.) the least width of this constriction is, respectively, 30 mm. 

 and 33 mm., while the nasal breadth at posterior extremity of premax- 

 illary is 30 mm. and 28 mm. In the four males recorded by Doctor 

 Volz" it is 34 mm., 34.5 mm., 34 mm., and 31 mm., as compared 

 with nasal breadths of 31 mm., 29 mm., 34 mm., and 30.5 mm. There- 

 fore in six adult skulls the parietal constriction invariably equals or 

 exceeds the nasal breadth, the averages for the two measurements 

 being 32.7 mm. and 30.4 mm. A like number of adult skulls of Sus 

 rhloiiis give the following measurements: Four females, parietal con- 

 striction, 22 mm., 16.4 mm., 13 mm., and 12.8 mm.; nasal breadth, 26 

 mm., 26 mm., 25 mm., and 22.6 mm.; two males, parietal constriction, 

 17 mm. and 22.6 mm.; nasal breadth, 27 mm. and 30.6 mm. The 

 parietal constriction in these specimens is invariably narrower than the 

 nasals; average.s of the two measurements, 17.3 and 26.3. The average 

 basal length for the two lots of skulls is: vittatus.^ 280 mm.; rhlonis, 

 276 mm. In five immature specimens of Sus rhionis., the parietal 

 constriction is with onl}^ one exception less than the nasal breadth; 

 in this skull (female No. 122929) the two measurements are the same. 



Externally the animal resembles Sus vittatus., and the skins show no 

 variations worthy of note. 



SUS PENINSULARIS, new species. 



Plate LVII. 



Ti/pe.—A.An\t female (skull only), No. 142470, U.S.N.M. Collected 

 near foot of Gunong Pulai, southwestern Johore, b}' C. B. Kloss. 



aZool. Jahrb., Abth. Syst., XX, p. 517, July 16, 1904. 



