miller] seventy new MALAYAN MAMMALS 49 



GALEOPITHECUS GRACILIS sp. nov. 



(Plate VI, figure 2) 

 1901. Galcopithccus volans Miller, Proc. Washington Acad. Sci., jNIarch 

 26, 1901. Part, specimens from Sirhassen Island. Not Lemur volans 

 Linnseus. 



Type. — Adult female (skin and skull), No. 104,601, United States 

 National Aluseum. Collected on Sirhassen Island, South Natunas, 

 June 7, 1900, by Dr. W. L. Abbott. Original number, 461. 



Characters. — Similar to Galeopithcciis piiniilus and G. aoris but 

 not as small. Skull more elongate than in the related species, and 

 with much narrower palate. 



Color. — The color so closely resembles that of the related species 

 as to require no detailed description. Both specimens are in the 

 gray pelage. 



Skull and teeth. — The skull (pi. vi, fig. 2) is slightly longer than 

 that of Galcopithccus aoris, but the width is distinctly less. This is 

 particularly noticeable in the rostral and lachrymal regions. On the 

 other hand, the zygoma is shorter and broader (deeper) than in the 

 related species. Palate narrower than in any other known member 

 of the genus. The teeth are rather larger than those of Galcopithccus 

 aoris, but I can detect no tangible peculiarities in form. 



Measurements. — External measurements of type : total length, 

 605; head and body, 4O5 ; tail vertebrae, 200; hind foot, 62 (59) ; 

 front foot, 73 (67) ; ear from meatus, 18 ; ear from crown, 14 ; width 

 of ear, 14. External measurements of adult male from the type 

 locality (No. 104,600) : total length, 410; head and body, 300; tail 

 vertebrae, no; hind foot, 62.6 (56) ; front foot, 6"/ (60) ; ear from 

 meatus, 14; ear from crown, 12.6; width of ear, 11. 



Cranial measurements of type : greatest length, 68 ; basal length, 

 65; basilar length, 61; lateral palatal length, 32.4; palatal width at 

 front of first incisor, 13; palatal width at space between canine and 

 first premolar, 20 ; distance between inner edge of posterior molars 

 (alveoli), 14.6; least distance from orbit to anterior nares, 24; zygo- 

 matic breadth, 38.4 ; depth of zygoma, 5 ; greatest orbital breadth, 

 40.2 ; least interorbital breadth, 17 ; breadth of braincase above roots 

 of zygomata, 21.6; mastoid breadth, 31 ; greatest depth of braincase, 

 17; occipital depth, 13.4; mandible, 49.6; depth of mandible between 

 canine and first premolar, 6 ; depth of mandible through coronoid 

 process, 20.4; maxillary toothrow (alveoli), 33; mandibular tooth- 

 row (alveoli), 34. 



Cranial measurements of adult male from the type locality (No. 

 104,600) : greatest length, 64; basal length, 61 ; basilar length, 57; 



