112 eECKONID^. 



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 smaU, 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 praeanal nor femoral pores. Tail, when in tact, cylindrical, 

 tapering, covered with very smaU 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. S $ • Yucatan, 



c. $. Granada. 



d-g. c? $ . St. Thomas, W. Indies. Mr. Eiise [C.]. 



h. (S . St. Thomas, W. Indies. Capt. Sawyer [P.l. 



ir-l. (J, 2, & hgr. Sta. Cruz, W. Indies. A. Newton, Esq. fp.]. 



m. 2 • Nevis. T. Cottle, Esq. [P.]. 



n. S- Antigua. Zool. Soc. 



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



Trinidad. 



q. cJ. Caracas, 



r. $ . British Guiana. 



8, (J. Surinam. Hr. Kappler [C.]. 



t. $ . Peba-s. H. W. Bates, Esq. [C.]. 



u-v. c? $ . Canelos, Ecuador. Mr. Buckley [C.]. 



vo-x. S • Sarayacu, Pei-u. W. Davis [C.j. 



y, z, «. c? 2 . S. America. 



2. Tliecadactylus anstralis. (Plate XI. fig. 1.) 



Thecadactylus australis, Glinth. Ann. 4* 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 



