3. AMPHISB^NA. 437 



b. Suture between the nasals not one third as long as that 

 between the pra4rontals. 



Ocular forming a suture with the second 



labial; a prseocular 15. mildei. p. 445. 



Ocular forming a suture with the second 



and third labials; no pra^ocailar .... IG. ca;ca, p. 445. 

 Ocular united with the second labial . . 17. cuhana, p. 446, 



2. Tour proefrontals. 



The two pairs of prsefrontals in front of 



each other 10. alhocinriuJata, p. 443, 



The two pairs on a transverse line .... 19. quadrifrons, p. 447. 



3. Prajfrontals, nasal and anterior 



labial on each side united into 



a single shield 23. leonina, p. 448. 



II. Nasals small, separated from each other. 



A pair of praefrontals ; rostral narrow 



superiorly ; snout pointed 25. fenestrata, p. 449. 



A single pra3frontal 2G. punctata, p. 450. 



A pair of proefrontals ; rostral large ; 



snout compressed 27. hrasiliana, p. 450. 



1. AmpMsbaena fuliginosa. 



Amphisbfeua aiiiericana, Gray, Cat. Tort. p. 70, 

 and Sh. liept. ii. p. 35. 

 Amphisba^na fuliginosa, Linn. S. N. i. p. 392 ; Daud. Rept. vii. 



p. 400, pi. xci. iig. 2 ; Guer. Icon. R. A., Rcpt. pi. xviii. tig. 1 ; 



Bum. ^- Bihr. v. p. 480 ; Strauch, 3M. Biol. Ac. St. Petersb. xi. 



1881, p. 376 ; Bocourt, Miss. Sc. 3/e.r., Rejit. p. 489, pi. xxi. f. 5. 



vulgaris, Laur. ISijn. Rept. p, GO. 



varia, Laur. I. c. 



magnifica, Laur. I. c. 



flava, Laur. I. c. p. G7. 



Usually : prsemaxillary teeth 5 ; maxillaries 5 — 5 ; mandibulars 

 8 — 8. Snout broad, rounded, slightly prominent. Tail not so thick 

 as the body, constricted at the base. IJostral moderate, subtri- 

 angular ; nasals very large, the largest shields of the head forming 

 a suture ; a pair of large prsefroutals and a pair of smaller frontals, 

 followed by two or three pairs of square shields ; eye distinct 

 through the ocular ; one or two infraocidars, the anterior, if present, 

 formed by division of the second labial ; upper labials three or four, 

 posterior small ; mental quadrangular, followed by a median sub- 

 pentagonal chin-shield ; on each side a pair of large chin-shields ; 

 three or four lower labials, first large, the others small. One 

 hundred and ninety-three to two hundred and seventeen aiiiuiU on 

 the body, and iwonty-fonr to thirty-two on the tail; the seginonts 

 of these annuli longer than broad on the back and sides, equilateral 

 or broader than long on the belly ; on the middle of the body, each 



