HERPETOLOOY OF PORTO RICO. 



683 



List of specimens of Amphisbsena bdkeri examined. 



«Typ . 



Suborder SERPENTES. 



The snakes are but poorly represented in Porto Rico, both as to 

 species and, at present at least, as to individuals. None of the poison- 

 ous forms, whether Crotalidae or Elapidae, are found, not even one of 

 the "suspects" or opistoglyphs. The four genera which occur belong 

 to no less than three families. They may be told apart by the follow- 



ing artificial 



KEY TO THE PORTO RICAN SNAKES. 



a 1 Underside of body covered with small scales like the back ( TypMopidse) 



Typhlops, p. 683. 



a 2 Underside of body covered with transverse plates. 



6 1 Plates on underside of tail undivided (Boidae) Epicrotes, p. 688. 



b a Plates on underside of tail in pairs (Coronellidae). 



c 1 Scales on back with one pore near the tip or none Leimadophis, p. 694. 



c 2 Scales on back with two pores Alsophis, p. 699. 



Figs. 138-140. — Head shields of Typhlops. /, frontal; ip, interparietal; I, supralabials; n, nasal; o, 

 ocular; p, parietals; pj, prefrontal; pro, preocular; pto, postocular; r, rostral; so, supraocular. 



Genus TYPHLOPS" Oppel. 



1811. Typhlops Oppel, Ordn. Rept., p. 54 (type T. lumbricalis) . 



1844. Ophthalmidion Dumeril and Bibron, Erpet. Gen., VI, p. 262 (type 0. longis- 



simuni). 



1845. Anilios Gray, Cat. Liz. Brit. Mus., p. 135 (type A. australis; not Anilius 



Oken, 1816). 

 1845. Mediloria Gray, Cat. Liz. Brit. Mus., p. 139 (type T. nasulus). 



arvcpXos, blind; chtl>, eve. 



