22. CHCEBONTCTERIS. 509 



canine and separated from the second by a space, and it has no 

 anterior basal projection*. 



The following Table exhibits the measurements (I.) of the type 

 (a dried skin), and (II.) those of an immature specimen (preserved 

 in alcohol) in which the permanent teeth have partially replaced the 

 milk dentition. The comparative measurements show that the type 

 specimen is not full-grown : — 



I. II. 



Length, head and body (about) 24 2-3 



,, interfemoral membrane in the middle 0"15 



head 1'05 1-05 



ear 06 0-6 



tragus 0-22 0-22 



,, foreai-m 16 1"7 



thumb 0-85 0-35 



„ third finger, metacarpal 1"6 1'6 



„ „ 1st phalanx 0"5 0'6 



2nd „ 0-85 0-9 



3rd „ 06 0-6 



„ fourth finger, metacarpal 1'5 1'5 



„ „ 1st phalanx 0-4 0-46 



2nd „ 0-6 0-55 



„ fifth fliiger, metacarpal 1'30 1'25 



1st phalanx 0-32 035 



2nd „ 0-5 0-5 



tibia 0-56 055 



foot 0-45 0-45 



Hab. Mexico ; Guatemala ; Brazil. 



a. imm. ad. sk. (type). Brazil. 



b. 5 imm., aL Brazil. 



c. j imm., al. Choctum. O, Salvin, Esq. [C.]. 



22. CHGERONTCTEEIS. 



Choeronycteris, Lichtensfein, Tsclmdi, Fauna Peruana, p. 70 (1844) ; 

 PeUrs, MB. Akad. Berl. 1865, p. 354, 1868, p. 366. 



Muzzle longer than in any of the preceding genera ; ears, tongue, 

 and nose-leaf as in Glossonyeteris ; tail short but distinct, appearing 

 on the upper surface of the weU-developed interfemoral membrane. 



n ^-j- T 2—2 1—1 3—3 3—3 



JJentition. inc. ^—^, c. j^, pm. ^^, m. ■^^. 



Outer upper incisors larger than the inner ones ; the lower inci- 

 sors and the first upper premolar deciduous ; molars very narrow, 

 without distinct W-shaped cusps ; skull very long, without zygo- 

 matic arches (Plate XXVII. figs. 6, 6 a). 



Range. Mexican and Brazilian Subregions. 



This genus agrees with Olossojphaga more closely than with any 



» Dr. Peters mentions (MB. Akad. Berl. 1869, p. 398) that he found in one 

 specimen, between the first and second lower premolars, a smaller premolar, so 



that the number of teeth in this species is pm, ^, m. ^—^. May not this 



email tooth be a persistent milk-tooth 7 



