15. BOA. 119 



4. Boa imperator. 



Boa imperator, i)fl!Mrf. Rept. y. p. 160 (1803) ; Bum. ^ Bibr. vi. p. 619 

 (1844) ; Gray, Cat. p. 101 (1849) ; Jan, Icon. G4n. p. 81, 1. 6, pi. i. 

 (1864) ; F. Milller, Verh. nat. Ges. Basel, vi. 1878, p. 650 ; Bocmrt, 

 Miss. Sc. Mex., Rept. p. 519, pi. xxx. fig. 8 (1882); Garm. N. Am. 

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



eques, Eyd. s/- Soul. Voy. Bonite, Zool. i. p. 144, Rept. pi. iv. 



(1841) ; Bum. ^ Bibr. t. c. p. 621 ; Gi-ay, I. c. ; Cope, Proc. Ac. 

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



ortonii, Cope, Proc. Am. Phuos. Soc. xvii. 1878, p. 35. 



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



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

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

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

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

 enlarged ; 1 5 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 td 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, Tg. (Sc. 79 ; V. 238 ; Ventanas, Mexico. Hr. A. Forrer [C.]. ' 

 C. 59). 



b. Yg. (Sc. 69 ; V. 235'; Atoyac, Mexico. Mr. H. H. Smith [C.]. 

 0. 49). F. 1). Godman, 



Esq. [P.]. 

 o-d. 2 (So. 67 ; V. 239; S. Mexico. F. D. Godman, Esq. 



C.641 &hgr.(Sc.79; [P.]. 



V. 248 ; C. 53). 



e. 2 (Sc. 69 ; V. 233 ; Mexico. M. Sails [C.]. 

 0. 49). 



f. Yg. (Sc. 69 ; V. 242 ; Mexico. E. Cooke, Esq. [P.]. 

 0.50). 



g. Yg. (Sc. 71 ; V. 225 ; Mexico. 

 C. 61). 



h. $ (Sc. 65 ; V. 236 ; Vera Paz, low 0. Salvin, Esq. [0.]. 



C. 57). forest. 



i. 2 (Sc. 69 ; V. 242 ; Guatemala. 0. Salvin, Esq. [C.]. 



' C. 54). 



Jc 2 skin (Sc. 69 ; V. Costa Rica. F. D. Godman, Esq. 



'243; 0.65). [P-]- 



I Hgr. (3 (Sc. 79; V. Esmeralda, Ecuador. Mr. Fraser [C.]. 



' 246 ;' 0. 65). 



m. Yg. (Sc. 77; V.231; N.W. coast of S. Lieut. Wood [P.], 



C. 58). America. 



n, o. Hgr., stffd. Tropical America. 



5. Boa mexicana. 



Boa mexicana, Jan, loon. Gin. 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. 



