70 SMITHSONIAN MISCELLANEOUS COLLECTIONS [vOL. ^5 



121,662) of the same size is normal. In the type the tuft of hairs 

 at end of tail is better developed than in any of the others. This 

 tuft is occasionally represented by a mere lengthening" of the short 

 hairs that are sprinkled over the rest of the tail. 



SYMPHALANGUS KLOSSII sp. nov. 



(Plate XVII, figure 2; Plate XVIII, figure 2; Plate XIX, figure i) 



Type. — Adult male (skin and skull), No. 121,678, United States 

 National Museum. Collected on South Pagi Island, Sumatra, No- 

 vember 13, 1902, by Dr. W. L. Abbott. Original number, 2032. 



Characters. — A dwarf siamang of about half the weight of 

 Syuiphalangus syndactylus. Fur shorter and less woolly than in the 

 Sumatran animal. Throat densely furred in both sexes. 



Fiir. — The fur is moderately long, and of a silky texture, not 

 coarse and woolly as in Symphalangus syndactylus. It shows only a 

 slight tendency to lengthen on neck and shoulders, and scarcely any 

 on thighs and outer surface of upper arms. On underparts it is 

 rather shorter than elsewhere, becoming rather thin in hypogastric 

 region, but on throat it continues uninterruptedly to chin. Eye- 

 brows scarcely lengthened, giving the forehead a peculiar rounded 

 appearance. 



Color. — The color is black throughout, and there are no whitish 

 hairs on face and chin. 



Skull and teeth. — The skull and teeth (pi. xvii, fig. 2 ; pi. xviii, 

 fig. 2 ; pi. XIX, fig. I ) so closely resemble those of Symphalangus 

 syndactylus (pi. xvii, fig. i ; pi. xviii, fig. i ; pi. xix, fig. 2) that I 

 can detect no constant differences other than size. 



Measurements. — External measurements of type : head and body, 

 to symphysis pubis, 440 (525) ;^ foot, 130 (154). External meas- 

 urements of an adult female (No. 121,687) fi'om the type locality: 

 head and body, 445 ; foot, 123. 



Cranial measurements of type: greatest length, 97 (129) f- basal 

 length, 75 (109) ; basilar length, 70 (104) ; median palatal length, 

 36.8 (59) ; palatal breadth between front molars, 16.4 (27) ; zygo- 

 matic breadth, 65 (90) ; mastoid breadth, 64 (78) ; greatest breadth 

 of braincase above roots of zygomata, 56.6 (66) ; least breadth of 

 braincase immediately behind orbits, 45.4 (49) ; greatest orbital 

 breadth, 58 (75) ; least interorbital breadth, 9 (15) ; least distance 

 from orbit to alveolus of middle incisor, 23.6 (38) ; greatest depth 

 of braincase, 46 (55) ; mandible, 68 (95) ; depth of mandible at pos- 



^ Measurements in parenthesis are those of an adult male Syinphalangus 

 syndactyhis from Tapanuli Bay, Sumatra (No. 114,496). 



