112 



i 



OEOKONID^. 



Head large, longer than broad; snout subtriangular, slightly 

 longer than the distance between the eye and the ear-opening, once 

 and a half the diameter of the orbit ; forehead concave ; ear-opening 

 small, oval, horizontal. Body and limbs moderate; digits sub- 

 equal, half-webbed, the web being as much developed between the 

 two outer; a rudimentary claw generally distinguishable in the 

 inner digit. Head covered with very small granular scales ; 

 rostral quadrangular, twice as broad as high, with trace of median 

 cleft above ; nostril pierced between the rostral, the first upper 

 labial, a large supero-nasal, which is in contact with its fellow, and 

 a few granules ; nine to twelve upper and eight to eleven lower 

 labials ; mental small, pentagonal ; a row of small chin-shields, 

 median pair elongate. Back, limbs, and throat covered with very 

 small granular scales ; belly covered with small imbricate cycloid 

 scales. No preeanal nor femoral pores. Tail, when intact, cylindrical, 

 tapering, covered with very small imbricated scales, largest in- 

 feriorly ; generally strongly swollen at the base when reproduced. 

 Brown or greyish-brown above, variegated with darker and lighter ; 

 lower surfaces whitish, immaculate. 



Total length 195 millim. 



Head 24 „ 



Width of head 20 „ 



Body 81 „ 



Fore limb 30 „ 



Hind limb 36 „ 



Tail 90 „ 



South and Central America; West Indies. 



a-b. (3 2 ■ Yucatan. 



c. J. Granada. 



d-ff. tS $■ St. Thomas, W. Indies. Mr. Eiise [C.]. 



h. cJ. St. Thomas, W. Indies. Capt. Sawyer [P.]. 



i-i- d, S, & hgr. Sta. Cruz, W. Indies. A. Newton, Esq. [P.]. 



m. $ . Nevis. T. Cottle, Esq. [P.]. 



n. cJ. Antigua. Zool. Soc. 



o-p. 2 & hgr. Anguilla, a rock near W. J. Cooper, Esq. [P.]. 



Trinidad. 



g. cj . Caracas. 



r. 2 ■ British Guiana. 



s.S- Surinam. Hr. Kappler [C.]. 



t. 2 ■ Pebas. , H. W. Bates, Esq. [C.]. 



u-v. (S 2 ■ Canelos, Ecuador. Mr. Buckley [C.]. 



w-x. S ■ Sarayacu, Peru. W. Davis [C.j. 



y,>i,<^. 6 2- S. America. 



2. Thecadactylus aiistralis. (Plate XI. fig. 1.) 



Thecadactylus australis, Oiinth. Ann. ^ Mag. Nat. Hist. (4) xix. 1877, 

 p. 414. 



Head large, oviform elongate ; snout as long as the distance 

 between the eye and the ear-opening, once and two thirds the 



