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Show 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 1"*2; ear 0"*65, tragus 0"*1 ; forearm 2"*1 ; thumb 0"4 ; second finger-metacarp. 2"0, 1st ph. l"05, 2nd ph. 1"*15; third finger- metacarp. 1"*95, 1st ph. 0"*9, 2nd ph. 0"*2; fourth finger-metacarp. 1"*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 OBSCURUS. Molossus obscurus, Geoffroy, Aunal. du Mus. vi. (1805), p. 154 ; Gervais, I. c. fig. 5 (skull). Molossus longicaudatus, Geoffroy, I. c. Molossus acuticaudatus, Geoffroy (vide Peters, Mon. Akad. Berlin, 1869, p. 402). Dysopes velox, Natt. Temminck, Monogr. Mammal, i. p. 234 (1836); Wagner, Suppl. Schreb. Saugeth. i. p. 476 (1844), v. p. 712 (1855) ; Burmeister, Thiere Brasiliens, Th. i. p. 71 (1854). Molossus velox, Gray, Mag. Zool. Bot. ii. (1838), p. 501. Molossus fuliginosus, Gray, I. c. Molossus tropidorhynchus, Gray, Aim. Nat. Hist. 1839, p. 5. Dysopes olivaceo-fuscus, Natt. Wagner, Abh. Munch. Akad. v. p. 202 (1844). (Fide Peters, I. c. 1866, p. 22.) Dysopes furnarius, Burmeister, /. c. p. 71. Molossus furnarius, Tomes (non Spix), P. Z. S. 1861, p. 68. Quite similar to M. rufus in structure, but much smaller, the forearm constantly measuring 1"7 or less, as compared with 2"*1. The fur covering the wing-membrane between the humerus and forearm extends somewhat further outwards ; aud 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 1"*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 finger-metacarp. 1*55, 1st ph. 0"*65, 2nd ph. 0"*15; fourth finger |
