t>. SACCOPIERYJC. 377 



the upper half, and a smaller above the slightly developed anti- 

 tragus. Tragus with two slight emarginations on its outer side, 

 and abruptly truncated above, about double as high as broad, main- 

 taining almost the same width upwards. Nasal apertures obliquely 

 oval, directed forwards, opening close to the margin of the upper 

 lip, separated one from the other by a space equal to the width of 

 one nostril ; upper lip with a central small wart-like prominence 

 lying directly beneath the space between the nostrils ; muzzle rather 

 broad and gradually flattened ; lower lip with a raised naked space 

 in front divided by a vertical groove. 



Wings from the base of the toes ; antebrachial membrane with a 

 small flattened elevation (in the female) on the side near the 

 shoulder. 



Fur reddish brown above, paler beneath, the hairs dark brown at 

 the base ; volar membranes dark brown. 



Above, the wing-membrane is clothed as far outwards as a line 

 drawn from the proximal third of the humerus to the same part of 

 the femur ; the interfemoral membrane is covered as far as the end 

 of the tail, beneath more thinly ; but almost the whole surface is 

 covered with short stiff hairs arranged along the transverse lines. 



Premaxillary bones very small ; frontal bones flattened, with a 

 central longitudinal groove ; auditory bull(B ossece large, approxi- 

 mated. 



Dental formula as in Saccoptery.v. 



Length, head and body 2"-2, tail 0"-8, head 0"-75, ear 8", tragus 

 0"-23, forearm l"-75, thumb 0"-26 ; third finger — metacarp. 2", 

 1st ph. 0"-85, 2nd ph. l"-3 ; fourth finger — metacarp. l"-65, 1st 

 ph. 0"-42, 2nd ph. 0"-44 ; fifth finger— metacarp. l"-5, 1st ph. 0"-44, 

 2nd ph. 0"-3 : tibia 0"-7, calcaneum 0"-65, foot 0"-3. 



Hab. Brazil (Rio do Espirito Santo) ; Peru. 



The above is taken from Dr. Peters's description of a female spe- 

 cimen of this species from Peru, which he had compared with the 

 type of Vespertilio calcaratus, Wied*, also a female specimen and in 

 bad condition. These are the only specimens of this species as yet 

 obtained, and it is therefore impossible to say to what extent a 

 wing-sac exists in the male ; but the flattened elevation on the 

 inner side of the antebrachial membrane in the female (described 

 above) is evidently the rudiment of the wing-sac, which I believe 

 wUl be found in the male. 



Dr. Peters, considering this species the type of a distinct genus, 

 remarks, that in the form of the ears and tragus, and in the general 

 structure of the skull, it approaches the section of which Sacco- 

 pteryx leptura is typical, whilst in the much broader mesopterygoid 

 fossa, and the weaker zygomatic arches, it is more closely related 

 to Peromjmus [Saccopteryx (Peropterijx) leucoptera} and to Mhy^i- 

 chonycteris. 



Cenfronvctcris calearata. Gray (Voyage of the ' Sulplmr 1844 p. 69),= 

 EmhalLnra semicaudata, Wied, a8 the specimen m the collection hows (,W» 

 antea, p. 361). 



