116  BOID.®, 
e,f. Yg. (Se. 59, 61; V. 248, Brazil. 
251; C. 64, 71). , 
gf Ad., stffd. 8. America. 
., skel. S. America. 
., Skull, Cayenne. 
15. BOA. 
art., Linn, Syst. Nat. i. p. 373 (1766); Schleg. Phys. ii. 
Bom Pa Gasn Sy P- ) 5 hys. Serp. 
Ccndsichint Laur, Syn. Rep rp . 106 Mebns 
Boa, Wagl. Syst. priser p- et (1830) ; Dum. §& Bibr. Erp. Gén. vi. 
p. 500 (1844); Gray, Cat. oe (1849) ; Jan, Icon. Gén, p. 80 
(1864) ; Bocourt, Miss. Se. Mex, Ret. p- B17 (1882). 
Draco (non casas , part., Oken, Lehrb. Naturg. i O18 ae Tn 
Byers Se (non Dej.), Dum. &§ "Bibr, t, c. p. 528 ; Greg. be ec pl 
Jan, le 
Accarhepie Ta Jan, l. C. p. 82; Bocourt, l. e. p. 521. 
Anterior maxillary ‘and mandibular teeth longest, gradually 
decreasing in size. Head distinct from neck, covered with small 
scales, with or without enlarged shields on the loreal and supra- 
ocular regions; nostril between two or three nasals. Eye rather 
small, with vertical pupil. Body cylindrical or feebly compressed ; 
scales very small, smooth. Tail short, more or less prehensile; sub- 
caudals all or part single. 
Tropical America; Madagascar. 
Synopsis of the Species. 
I. Loreal region with small scales or a single small shield; sub- 
caudals 45 to 69. 
Scales in 81 to 95 rows on the thickest 
part of the body; ventrals 234-243; 
rostral a little broader than deep; sym- 
physial at least as long as broad ...... 1. constrictor, p. 117. 
Scales in 65 to 87 rows; ventrals 242-251 ; 
rostral as deep as broad ; : symphysial 
broader than long ...............005 2. occidentalis, p. 118. 
Scales in 65 to 75 rows; ventrals 258-275 ; 
rostral a little broader than deep ; sym- “¥ 
J physial at least as long as broad ...... 3. diviniloqua, p. 118. 
Scales in 61 to 79 rows; ventrals 225-252; 
rostral as deep as broad ; symphysial at 
least as long as broad ............. Pies ¥ imperator, p. 119. 
Seales in S5TOWS .54 5 Giee bcc conan -.. 5. mewicana, p. 119. 
II. Loreal region with several shields; subcaudals 20 to 41. 
Scales in 59 to 65 rows; subcaudels 20 
33 a otacd be v.60 e » eieaig ice Sekine ee ene - 6. dumerilii, p. 120. 
Scales in 69 to 77 rows; subca lidale 34 
COA) 58 ie ee i CS Re Limatagar anne, 
j j [p. 120. 
