27. ClIIRODEEMA. 533 



Head with four very broad and very white streaks ; no streak 

 along the spine. Fur moderately long and dense. Above tricoloured, 

 brown at the base, then pale yellowish brown, the terminal fourth 

 of the hairs dark brown ; beneath brown, the extreme tips ashy. 

 The humerus and muscular part of the forearm are well covered ; 

 the greater part of the antebrachial membrane is naked ; on the 

 wing-membrane the fur extends rather densely as far as a line drawn 

 from the elbow to the knee ; the whole interfemoral is covered with 

 soft fur, which thins out towards its posterior margin ; the legs and 

 feet are clothed with short hairs. At the base of the thumb some 

 short light brown hairs. 



Upper middle incisors slender, unicuspidate, rather long and 

 acutely pointed, each tooth separated by its base from the opposite 

 tooth, but with its cusp directed obliquely inwards, so as to approach 

 it near its extremity (Plate XXIX. fig. 3 a) ; each outer incisor very 

 small, in the centre of the space between the inner incisor and the 

 canine ; first upper premolar small, with a single very oblique cusp 

 directed forwards, so as to touch the base of the canine by its ante- 

 rior side, posteriorly the tooth is separated from the second premolar 

 by a space ; second upper premolar with a straight cusp, like that of 

 a small canine, and a small posterior and external basal projection ; 

 second (last) upper molar about a third larger than the first, both 

 molars with a pair of cusps externally, with concave crowns in- 

 ternally not so broad as in Artibeus, and without internal projec- 

 tions ; lower incisors very small, slightly grooved on their crowns ; 

 first lower premolar with an almost flat oval crown but slightly 

 raised above the gum ; second and last molar very large, nearly 

 double the antero-posterior diameter of the first molar and almost 

 three times its size, with a concave crown margined by five blunt 

 elevations (Plate XXIX. fig. 3). 



The distance between the outer cusps of the last molars in the 

 upper jaw is slightly greater than the distance from one of the 

 middle upper incisors to the posterior edge of the last molar. 



The nasal opening is prolonged backwards by a very distinct 

 narrow cleft as far as a line corresponding to the anterior margin 

 of the orbit (Plate XXIX. fig. 3 b). 



Length, head and body 2"-8, interfemoral membrane in the middle 

 0"-7, head 1"-15, ear 0"-7, tragus 0"-25, nose-leaf 0"-45x0"-3, 

 forearm 2", thumb 0"-4 ; third finger — metacarp. l"-8, 1st ph. 0"-75, 

 2nd ph. r'-05, 3rd ph. 0"-8 ; foiirth finger — metacarp. l"-75, 1st ph. 

 0"-6, 2nd ph. 0"-7 ; fifth finger— metacarp. l"-75, 1st ph. 0"-5, 2nd 

 ph. 0"-6; tibia 0"-65, calcaneum 0"-25, foot 0"-4. 



Hab. Costa Rica. 



The white streaks on the head appear to be, in this species, wider 

 and more distinct than in any other species of this group. The 

 form of the first lower premolar, the large size of the interfemoral 

 membrane, and the smaUness of the feet at once distinguish the 

 species. 

 a. (J ad., al. (type). Costa Rica.- 0. Salvin, Esq[. [C], 



