710 MR. G. E. DOBSON ON THE MOLOSSI. [Nov. 7, 



Upper incisors moderately long and acutely pointed, converging 

 inwards and forwards, their bases touching the canines, their inner 

 sides approximated ; at the outer side of the base of each tooth, a 

 small blunt projection from the cingulum which touches the canines ; 

 the single upper premolar large, and close to the canine ; lower 

 incisors two, bifid, in front of the closely approximated canines 

 which have each a broad internal basal, cusp ; first lower premolar 

 scarcely half the size of the second, which lies so close to it as to be 

 with difficulty distinguished in recent specimens as a separate tooth, 

 its outer and posterior side is partially covered by the obliquely 

 directed cingulum of the second premolar ; last upper molar narrow, 

 less than half the size of the antepenultimate molar. 



Length (of an adult male) : head and body 3" , 5 ; tail 2""0 ; head 

 l"-2; ear 0"65, tragus 0"*1 ; forearm 2"'l ; thumb 0" - 4; second 

 finger — metacarp. 2" - 0, 1st ph. 1"'05, 2nd ph. 1"'15 ; third finger — 

 metacarp. 1"95, 1st ph. 0"-9, 2nd ph. 0"'2; fourth finger — meta- 

 carp. l" - 3, 1st ph. 0" , 55, 2nd ph. 0""25 ; tibia 0""7 ; foot and claws 

 0"-5. 



Hab. Mainland of Tropical America (Rio de Janeiro, Pernambuco, 

 Para, Rio Negro, Dutch Guiana, Oaxaca). 



Subspecies a. Molossus obsctjrus. 



Molossus obscurus, Geoffroy, Aunal. du Mus. vi. (1805), p. 154 ; 

 Gervais, /. c. fig. 5 (skull). 



Molossus longicaudatus, Geoffroy, /. c. 



Molossus acuticaudatus, Geoffroy (vide Peters, Mon. Akad. Berlin, 

 1809, p. 402). 



Dysopes velox, Natt. Temminck, Monogr. Mammal, i. p. 234 

 (1836); Wagner, Suppl. Schreb. Saugeth.i. p. 470 (1844), v. p. 712 

 (1855) ; Burmeister, Thiere Brasiliens, Th. i. p. 71 (1854). 



Molossus velox, Gray, Mag. Zool. Bot. ii. (1838), p. 501. 



Molossus fidiginosus, Gray, I. c. 



Molossus tropidorhynchus, Gray, Ann. Nat. Hist. 1839, p. 5. 



Dysopes o/icaceo-fuscus, Natt. Wagner, Abb. Munch. Akad. v. 

 p. 202 (1844). (Fide Peters, I. c. 1866, p. 22.) 



Di/sopes fumarius, Burmeister, /. c. p. 71. 



Mohssus fiuuarius, Tomes (non Spix), P. Z. S. 1861, p. 68. 



Quite similar to M. rufus in structure, but much smaller, the fore- 

 arm constantly measuring 1"'7 or less, as compared with 2"'l. 



The fur covering the wing-membrane between the humerus and 

 furearm extends somewhat further outwards; and the upper incisors 

 are closer together. 



It will probably be found hereafter, when a sufficiently large 

 number of specimens are available for examination, that the above- 

 named differences are unimportant, and that the only real difference 

 consists in size. 



Length (of an adult J ) : head and body 2"'7 ; tail l" - 6 ; head 

 0"'85 ; ear 0''"55, tragus 0""08 ; forearm 1"'65 ; thumb 0"*3 ; 

 second finger — metacarp. 1"6, 1st ph. 0" - 75, 2nd ph. 0""6 ; third 

 linger — metacarp. 155, 1st ph. ()"G5, 2nd ph. 0""15; fourth finger 



