756 MR. 0. THOMAS ON TWO NEW PTEROPI [Dec. 19, 
PTEROPUS PHHOCEPHALUS, sp.n. (Plate LIV.) 
Face and chin dark blackish brown, crown of head somewhat 
lighter ; dorsal side of neck, and back, chestnut-brown, the tips of 
the hairs nearly white ; shoulders and sides of neck very pale yellowish 
white, forming well-marked shoulder-patches ; the bases of the hairs 
brown ; below neck very light brown. Chest with a conspicuous 
patch of yellowish white on its centre; rest of underside and fur on 
the interfemoral membrane and wings dark rufous-brown. Tips of 
the hairs throughout, and especially on the head and neck, with a 
very noticeable silvery lustre. 
Above, the fur is nearly two inches in breadth across the back, 
and extends thinly half along the humerus, while the forearm is quite 
naked. Below, it grows on the wing-membrane as far as a line 
drawn from the elbow to the knee, and there is a distinct patch of 
longish hairs behind the proximal third of the forearm. Inter- 
femoral thickly covered above for half its breadth, nearly naked 
below. 
Ears narrow, slightly longer than the muzzle, inner margin evenly 
convex, tip narrowly rounded off, outer margin straight in its upper, 
convex in its middle, and straight in its lower third. Wings arising 
from within half an inch of each other on the back. Interfemoral 
very narrow, almost obsolete in the centre. 
Teeth (Plate LIV.) on the whole very small and weak. Ca- 
nines, both above and below, with unusually broad postero-internal 
basal ledges. First upper premolar minute or deciduous, when 
present standing in the tooth-row; second premolar and first molar 
scarcely longer than broad, second molar regularly oval; last molar 
subtriangular, rather smaller than the first lower premolar, and 
larger than the last lower molar, which is about equal to one of the 
outer upper incisors. Below, the inner incisors are about half the 
size of the outer ; first premolar large, filling up the space between 
the canine and second premolar; second and third premolars and 
first molar with small postero-external basal cusps. 
Dimensions of the type, a gravid female in alcohol, from Mortlock 
Island :— 
Head and body 6 inches ; head 1°95 ; nose toeye 0°7 ; nose to ear 
1°55; ear-conch, length ‘86, breadth 43; forearm 4°0; thumb 
1°6 ; 2nd finger 2°75 ; 3rd finger—metacarpal 2°65, 1st phalanx 1°85, 
2nd phalanx 2°75 ; 5th finger—metacarpal 2°75, 1st phalanx 1-2, 2nd 
phalanx 1°25 ; tibia 1-9 ; caleaneum 0°4; foot 1°25. - 
This brightly marked species seems to be most nearly allied to 
Pt. temmincki, Peters, from Amboina and Ceram; from which, 
however, it differs in its brown instead of yellow head, in its shorter 
muzzle, rounder molars, much larger first lower premolars, and 
in the broader postero-internal ledges to the canines. 
PTEROPUS BREVICEPS, sp.n. (Plate LV.) 
Colour throughout uniform dark rufous-brown, the short hairs on 
the muzzle and between the eyes silvery yellow. Fur soft and 
