15. BOA. 



119 



4. Boa imperator. 



Boa imperator, Daud. Hept. v. p. l."JO (1803) ; Ihan. i§- Bi/ir. vi. p. .519 

 (1844) ; Gmi/, Cat. p. 101 (1840) ; Jan, Icon. Gen. p. 81, 1. G, pi. i. 

 (1804) ; F. Miiller, Vcrh. nat. Ges. Basel, vi. 1878, p. 650 ; Bocourt, 

 Miss.'Sc. Mex., Kept, p.oie, pi. xxx. fig. 8 (1882); Garm. N. Am. 

 Rept. p. 8 (1883) ; Cope, Bull. U.S. Nat. Mus. no. 32, 1887, p. 65. 



eques, Ei/d. |- Soul. Voy. Bonite, Zool. i. p. 144, Bept. pi. iv. 



(1841) ; Bmn. ^ Bibr. t. c. p. 521 ; Gi-ay, I. c. ; Cope, Froe. Ac. 

 Fhilad. 1861, p. 303; Jan, I. c. p. 82, 1. 6, pi. ii. 



ortonii, Coj)e, Froc. Am. Philos. Soc. xvii. 1878, p. 35. 



constrictor, var. isthmica, Garm. I. c, p. 9. 



Snout scarcely prominent. Rostral as broad as deep, not visible 

 from above ; symphysial at least as long as broad ; head-scales small, 

 sometimes slightly enlarged on the snout ; an enlarged loreal some- 

 times present, in front of the prtcoculars, one of which is more or less 

 enlarged; 15 to 18 scales across the forehead, from eye to eye; 14 

 to 20 scales round the eye, which is separated from the labials by 

 one or two series of scales; 18 to 21 upper labials. Scales in 61 

 to 79 rows. Ventrals 225-252 ; anal entire ; subcaudals 47-65. 

 Coloration as in B. constrictor, but no red on the tail, and dorsal 

 cross bars more numerous, viz. 22 to 30 on the body ; the dark 

 line on the middle of the head usually with a process on each side 

 between the eye, thus forming a cross. 



Total length 2800 millim. ; tail 280. 



Mexico to Western South America (Colombia to Peru). 

 a. Yg. (Sc. 79; V. 238; Ventanas, Mexico. Hr. A. Forrer [C.]. 



C. 59). 

 b. Yg. (Sc. 69; V. 235; 

 C. 49). 



c-d. 2 (Sc. 67 ; V. 239 



C. 54) & hgr. (Sc. 79 



V. 248 ; C. 53). 

 e. $ (Sc. 69 ; V. 233 



C. 49). 

 /. Yg. (Sc. 69 ; V. 242 



C. 50). 

 c/. Yg. (Sc. 71 ; V. 225 



C. 61). 

 h. ? (Sc. 65 ; V. 230 



C. 57). 

 i. 2 (Sc. 69 ; V. 242 



C. 54). 

 k. 2 , skin (Sc. 69 ; V. 



243 ; C. 55). 

 I. Hgr. S (Sc. 79; V. 



246 ; 0. 65). 

 m. Yg. (Sc.77; V. 231 ; 



C. 58). 

 «, 0. Hgr., stiFd. 



Atoyac, Mexico. 



S. Mexico. 



Mexico. 



Mexico. 



Mexico. 



Vera Paz, low 



forest. 

 Guatemala. 



Costa Rica. 



Esmeralda, Ecuador. 



N.W. coast of S. 



America. 

 Tropical America. 



5. Boa mexicana. 



Mr. H.H. Smith [C.]. 



F. D. Godman, 



Esq. [P.]. 

 F. D. Godman, Esq. 



[P.]. 



M. Sall6 [C.]. 



E. Cooke, Esq. [P.]. 



0. Salvin, Esq. [C.]. 

 0. Salvin, Esq. [C.]. 



F. D. Godman, Esq. 



[P.]. 

 jMr. Eraser [C.]. 



Lieut. Wood [P.]. 



Boa mexicana, Jan, Icon. Gen. .p. 82 (1864) ; Bocourt, Miss. Sc. 



Mex., Rept. p. 520, pi. xxx. fig. 9 (1882). 

 diviniloquax, var. mexicana, Jan, op. cit. 1. 5, pi. iv. 



