no. 1751. SOME NEW SPECIES OF UOXKEYS ELLIOT. 345 



PITHECUS LAUTENSIS. new species. 



Type-locality. — Pulo Laut, Xatuna [slands. 



Type— No. 104854, I'.S.X.M. 



General characteristics. Resembling P. lingungensis, but nol so 

 red; skull entirely different. 



Color. — Top of head and upper parts tawny ochraceous and brown- 

 ish black; arms and hands bluish gray, hairs tipped with cream buff; 

 outer side of thighs similar to back: legs olive gray; feel darker, 

 being brownish gray : underparts and inner side of limbs silvery gray ; 

 tail above blackish brown, becoming gradually paler toward tip, 

 beneath whitish gray. 



Measurements. — Total length, 1,018 mm.; tail, 548; skull, total 

 length, 112.2; occipito-nasal length, 95.3; hensel, 80.7; intertem- 

 poral width, 39.8; zygomatic width, 82.7; palatal length, 45.7; 

 breadth of brain ease, 54.5; median length of nasals, 27.1 : length of 

 upper molar scries, 27.1; length of mandible, 84.1; length of lower 

 molar series, 36.1 . 



This macaque is very similar in color on body and head to /'. 

 lingungensis, but is very different in the color of the limbs, arms 

 particularly. The main differences arc to be found in the 1 skull. 

 This has a very broad facial region and space across orbits very wide; 

 orbital ridge very heavy; the brain case is larger in every way, and 

 the roots of the zygomata broader and heavier; palate is wider; 

 basi-occipital and basi-sphenoid broader and longer and the zygo- 

 matic arch more widely spread. The outer edge of the occipital 

 region in P. lingungensis is rounded, but in the present species it is 

 pyramidal without the point. Incisors are smaller. Altogether the 

 two skulls are as different as they well can be of species belonging to 

 the same genus. One example only procured. 



PITHECUS SIRH/.SSENENSIS, new species. 



Ty.pe-locality .- Sirhassen Island, Natuna Group. 



Type.— Cat. No. 104852, I'.S.X.M. 



General characteristics. — General hue very dark, limbs and \\vt 

 paler; skull in general characters nearest to /'. lingungensis, hut tooth 

 rows much shorter. 



Color. — Top < f head, upper parts of body, and outer side of thighs 

 blackish brown and ochraceous, the hairs gray at base, then handed 

 with ochraceous and black and tipped with black: limbs, bands, 

 and feet pale gray, hairs handed with cream hull'; underparts and 

 inner side of limbs grayish white: tail above at base, blackish, hairs 

 ringed with ochraceous grading into smoke gray for remaining part; 

 beneath smoke gray. 



Measurements. Total length 1,110 mm.; tail, 600; skull, total 

 length, 113.3; breadth of brain case,.")!; intertemporal width, 10.5; 



