4. MA.CR0TT7S. 463 



caneum ; foot long and slender, two thirds the length of the tibia '< 

 tail terminating exactly at the margin of the large interfemoral 

 membrane, the posterior margin of which is angular, and when 

 expanded extends beyond the feet. 



Fur light reddish brown, not extending upon the membranes. 

 Skull narrow and moderately long, the brain-case vaulted and 

 raised above the face-line ; frontals depressed, a deep but short con- 

 cavity occupying this part of the skull ; nasal bones arched, their 

 extremities projecting in front over the nasal orifice, which is directed 

 forwards (Plate XXVI. fig. 1) ; basioccipital deeply excavated on 

 each side between and in front of the cochleae, the excavations sepa- 

 rated by a narrow central longitudinal osseous lamina ; bony palate 

 extending as far back as the centres of the zygomatic arches. 



Central upper incisors obliquely chisel-shaped ; outer incisors 

 filling up the space between them and the canines, each with a short 

 acutely pointed cusp directed inwards and downwards, not equalling 

 half the inner incisor in vertical extent ; first upper premolar very 

 small ; last upper molar nearly half the antepenultimate molar ; 

 lower incisors small, chisel-shaped, equal, not crowded ; first lower 

 premolar nearly equal to the third in cross section at its base, but 

 one third less than it in vertical extent ; second lower premolar 

 miniite, in the tooth-row, almost concealed by the adjoining teeth. 



Length, head and body 2"-4, tail 2"-2, head 0"-9, ear 1"-15 x 0"-8, 

 tragus 0"-7, nose-leaf l"-05, forearm 2", thumb 0"-35 ; third finger 

 — metacarp. l"-8, 1st ph. 0"-6, 2nd ph. 1", 3rd ph. 0"-5 ; fourth 

 finger — metacaqj. l"-7, 1st ph. 0"-5, 2nd ph. 0"-55 ; fifth finger — 

 metacarp. l"-65, 1st ph. 0"-5, 2nd ph. 0"-55 ; tibia 0"-8, foot 0"-5. 



Hab. ? Trinidad, West Indies. 



The only specimen of this very remarkable species as yet obtained 

 is preserved in the collection of the Museum of the Army Medical 

 Department at Netley. 



4. MACROTUS. 

 Macrotus, Grat/, P. Z. 8. 1843, p. 21. 



Muzzle conical, elongated ; nose-leaf small, at the extremity of 

 the muzzle, horseshoe-shaped in front, triangular behind, the nostrils 

 pierced in the centre of the anterior leaf, not depressed ; lower lip 

 oTooved in front, with a raised naked cushion on each side ; ears 

 large, united, tragus elongated ; first phalanx of the middle finger 

 not exceeding half the metacarpal bone in length ; antebrachial 

 membrane well developed ; tail long, contained in and produced to 

 the posterior margin of the large interfemoral membrane, beyond 

 which it projects. 



Dentition. Inc. ^, c. j^, pm. j^, m. 3^:3. 



Upper middle incisors unicuspidate and long ; lower premolars 

 nearly equal in vertical extent. 



Range. The Mexican and AntiUean Subregions of the Neotropical 



Eeffion. 



