372 EMBALLOJJl'RIDiK. 



Pur dark browu or black above, the extreme tips of the hairs 

 greyish ; beneath, similar but paler. 



On the upper surface the -wing-membrane is densely covered as far 

 as a line drawn from the distal third of the humerus to the knee, 

 the fur terminating by a sharply defined margin ; on the interfemoral 

 as far as the extremity of the tail, the femur and part of the tibia 

 being also covered ; the feet are naked. Beneath, the wing-mem- 

 brane is similarly covered, but the fur is finer and less densely 

 spread ; the whole of the interfemoral is clothed with short fine 

 hairs. 



Fpper incisors very slender and acutely pointed ; one incisor on 

 each side in the centre of the space between the canine and the 

 middle line ; lower incisors trifid, in the direction of the jaws ; upper 

 canine with an acute basal cusp in front and behind, separated from 

 the second premolar by a rather wide sjiace, in the anterior part of 

 which, close to the base of the canine and slightly external, the first 

 minute premolar is placed ; second premolar large, with an anterior 

 basal cusp ; fijst lower premolar triangular, short, with a blunt basal 

 cusp projecting from the cingulum in front and behind. 



Length, head and body l"-55, tail 0"-6, head 0""55, ear 0"'5, tragus 

 0"-12, forearm 1""4, thumb 0"-23 ; third finger — metacarp. l"-35, 

 1st ph. 0"-5, 2nd ph. 0"-7; fourth finger — metacarp. l"-2, 1st ph. 

 0"-3, 2nd ph. 0"-35 ; fifth finger— metacarp. 1"-15, 1st ph. 0"-32, 

 2nd ph. 0"-22; tibia 0"-6, calcaneum 0"-6, foot 0"-28. 



Hah. Surinam ; Brazil (Para, Santarem). 



2. Saccopteryx Mlineata. 



XJrocryptus bilineatus, Temmirwk, Van der Hoeven, Tijdsch. Natur- 

 ges'ch. p. 33, figs. 3, 4 (1839) ; Monogr. Mammal, ii. p. 301 (1836- 



41)- 

 Emballonura bilineata, Wagner, Stippl. Schreh. Sdugetk. v. p. 694 



(1855). 



Saccopteryx bilineata, Peters, MB. Akad. Berl. 1867, p. 471. 



In the form of the head and ears, and in the position and structure 

 of the wing-sac very similar to the preceding species, from which, 

 however, it is distinguished by its much greater size and by the 

 presence of two white longitudinal streaks on the back. 



The sac in the antebrachial membrane is remarkably large (in male 

 specimens), its mouth occupying a space on the upper surface of the 

 membrane along the second quarter of the forearm, being 0"-45 inch 

 long, leading into a deep sac, the concavity of which is marked with 

 numerous longitudinal vsrrinkles ; in females the sac is present in 

 the same position, but is very small, and the longitudinal wrinkles 

 are absent. 



Wings from the tarsus ; calcaneum and interfemoral membrane 

 as in S, lejptura. 



