NATURAL SCIENCES OP PHILADELPHIA. 159 



above and below this line the membrane has upon it several points of short 

 lanuginous hairs of a whitish color. 



The customary clumps of hair at the base of the ears are present. The an- 

 terior spot is larger than the posterior. 



The characteristic shoulder tufts are by no means conspicuous ; they are 

 composed of thin long hairs of a light color. The centres are quite naked and 

 placed more upon the neck than is usual. 



The skull is smaller than that of E. gambianus Ogil. The post-orbital pro- 

 cesses are small but well defined ; temporal fossse not approximate. The in- 

 termaxillaries slight, terminating in a point, not abruptly, as in E. gambianus, 

 and supports but two incisors. The latter occupy the centre of the inter-ca- 

 nine space, and are slightly separated from one another.* 



The other teeth differ in no particular from those of E. gambianus except in 

 their mode of articulation, in which the inferior incisors close in front to the 

 superior, as already seen in Hypsignathus, the superior teeth, however, are 

 not entirely hidden. 



This species holds a position between E. gambianus Ogil. and E. shoe7isis Riip. 

 It differs from the former in the relative length of the nose, in the tricolored 

 hair of back, and in the greater extent of the epigastric patch ; from the latter 

 in being much larger, and in the absence of the dark colored abdomen. 



Dimensions. 



Length of head and body 6*0 



" from snout to base of ears 1-6 



" " eye to snout 0*8 



" " anterior part of eye to ear 0*8 



Height of ears 0*9 



.Breadth of ears 0'6 



length from nose to wing membrane 2 - 8 



" of forearm 3*0 



" longest finger 6"0 



" fourth " 4-8 



" thumb and claws 1-2 



" basal joint 0*3 



" second joint - 8 



" tibia 1-6 



" foot and claws f>8 



Expanse of wing membrane 18'0 



Hab. Western Africa ; discovered by M. Duchaillu. 



Ptekopus mollipilosps, n. s. Head small ; ears large. Envergure great. 

 Interfemoral membrane scanty. Tail very small, free. General hue olive brown ; 

 brighter upon the back of the neck, where a faint dusky-brown line is seen tra- 

 versing the thick fur of this region. Antero-posteriorly a patch of the same hue 

 lies upon each shoulder ; that upon the back is thinner and darker. The in- 

 terfemoral membrane is well furnished with soft olive brown hair, which be- 

 comes more scanty and shorter as it runs down the legs and the back of the 

 feet to the claws. Back of the humerus and ulna thinly covered with the 

 hair of the prevailing hue ; anterior part of neck russet ; belly of the sanw 

 prevailing color as the back, with an inclination to dusky red upon the thighs. 



* This disposition of the superior incisors is peculiar We know that these teeth fre- 

 quently vary; as, for instance, in the genus Hypoderma, where the young animal has 



4 2 2 



i -and later in life -; the elderly animal possessing but -. Thus, the difference in the 



4 2 



number of the incisors is not of the importance which might at first sight be supposed. 

 It is interesting, however, to know that this is the only instance of incisorial variation 

 as yet seen among the species of Kpomophorus. 



1861.] 



