1876.] MR. G. E. DOBSON ON THE MOLOSSI. 713 



Fur short, and intensely black above and beneath. The muzzle in 

 front of the ears is nearly naked, also the inferior surface of the lower 

 jaw. Tbe fur of the body extends upon the wing-membrane above 

 almost as far as a line drawn from the middle of the humerus to the 

 knee-joint ; beneath, as far as a line drawn from the middle of the 

 humerus to the middle of the femur ; a small patch of fur appears 

 on the upper surface of the antebrachial membrane near the forearm ; 

 and the base of tbe interfemoral is covered ; but the remainder of 

 the membranes are naked. 



Upper incisors close together, parallel ; lower incisors very small, 

 bifid, the outer incisor on each side concealed between the middle 

 incisor and the base of the canine ; inner basal cusps of the lower 

 canines almost touching behind the incisors as in M. rufus. First 

 upper premolar very small, scarcely raised above the gum, and 

 scarcely visible without aid of a lens, in the small space between the 

 canine and second premolar, but close to the outer margin of that 

 space ; in another specimen, this small premolar is larger, and out- 

 side the tooth-row, though a narrow space still intervenes between 

 the canine and the second premolar. 



Length (of an adult $) : head and body 3"*25; tail 1"'8, tail 

 free from membrane "'9 ; head 1"*15; ear 0" - 8, tragus 0"*12; 

 forearm 2" # 45 ; thumb 0""45; second finger — metacarp. 2" "4 ; 1st 

 ph. 1 "'1, 2nd ph. l" - 3 ; third finger— metacarp. 2"*3, 1st ph. 0"'9, 

 2nd ph. 0"'4 ; fourth finger — metacarp. 1"*2, 1st ph. 0"'8, 2nd ph. 

 0"'35 ; tibia 0"*7; foot and claws 0" - 4. 



Hab. Brazil (Mato Grosso, Barra do Rio Negro) ; Surinam ; 

 Peru. 



Prof. Peters has very kindly sent me a specimen of this species 

 which he had determined by direct comparison with the type in tbe 

 Leyden Museum. Tbe absence of a gular sac, mentioned by Tem- 

 minck, is due to the immature condition of the specimen from which 

 the original description was taken. 



7. MoLOSSUS PEROTIS. 



Dysopes perotis, Wied, Beitr. Naturg. Brasil. ii. (1825), p. 227 ; 

 Wagner, Suppl. Schreb. Saugeth. i. p. 473, v. p. 708; Burmeister, 

 Tbiere Brasiliens, p. 68 (1854). 



Dysopes rvfus, Temm. (non Geoffr.), Monogr. Mammal, i. p. 230 

 (1835-41). 



Dysopes (Molossus) yiyas, Peters, Mou. Akad. Berl. 1864, p. 381. 



Molossus (Promops) perotis, Peters, I.e. 1865, p. 574. 



Ears very large, united in front ; laid forwards, they extend be- 

 yond the extremity of the nose ; tbe outer and inner margins of the 

 ear-conch regularly circular ; antitragus much longer than high, 

 convex, separated posteriorly by an angular notch, tragus quadrate 

 with rounded angles, no prominent lobule at the base of the outer 

 margin ; keel of the ear-conch well developed, thickened and flat- 

 tened externally. Muzzle very obliquely truncated, the extremity of 

 the nose projecting much beyond the retracted upper lip, which is 

 also concealed by a fringe cf short hairs ; nasal apertures directed 



