180 OPHIDIA. 
EPICRATES. 
Epicrates, Wagler, Syst. Amphib. p. 168 (1830). 
1. Epicrates cenchris. 
Boa cenchria, Linn. Syst. Nat. i. p. 374; Wied, Abbild. Naturg. Bras., Rept. t. 18; Schleg. Ess. 
ll. p. 385, t. 14. figg. 3-5. 
Epicrates cenchria, Gray, Viper. Sn. p. 96; Cope, Journ. Ac. N. Se. Phil. viii. p. 130 (1875). 
Epicrates cenchris, Dum. & Bibr. Erpét. vil. p. 555; Jan, Iconogr. Ophid. viii. t.1; Boul. Cat. Sn. 
1. p. 94. 
Epicrates maurus, Gray, Viper. Sn. p. 94. 
Cliftia fusca, Gray, Viper. Sn. p. 99. 
Epicarsius cupreus, Fisch. Abhandl. naturf. Ver. Hamburg, ili. 1856, p. 96, t. 2. fig. 1. 
Epicrates cupreus, Jan, Jconogr. Ophid. vii. t. 1. 
Hab. Costa Rica (Mus. Hamburg); Panama, Chagres River (Mus. Brit.).—Tropicat 
SourH AMERICA. 
The variation in the number of rows of scales has a very great range, viz. from 39 
to ol. 
CORALLUS. 
Corallus, Daudin, Hist. Rept. v. p. 256 (1803) ; Gray, Viper. Sn. p. 97. 
1. Corallus cooki. 
Corallus cookii, Gray, Zool. Misc. p. 42 (1842) ; Boul. Cat. Sn. i. p. 99. 
Corallus hortulanus (part.), Gray, Viper. Sn. p. 97. 
Diphosoma ruschenbergerii, Cope, Journ. Ac. N. Sc. Phil. viii. p- 129 (1876) ; Bocourt, Miss. Sc. 
Mex., Rept. p. 527. 
Hab. Panama (Ruschenberger).—Co.omBIa ; VENEZUELA; Wuinpwarp Is. 
Like other Boid snakes, Corallus hortulanus and allied specific forms vary in an 
extraordinary manner as to the number of scales. If C. cooki were not separated from 
C. hortulanus, this species would include specimens with scales varying from 39 to 59, 
the increase in numbers being due to the small size of the scales on the sides of certain 
individuals. So far as the evidence from our specimens goes, the lesser number 
of rows of scales (39-47) is found in the snakes from the West Indies, Venezuela, 
Colombia, and Panama, whilst the larger number (53-59) occurs in specimens from 
Guiana and Brazil. ‘There is a specimen from the Schomburgk collection in the 
British Museum, said to be from “ British Guiana,” having the scales in 43 series only. 
But as the collection which Sir R. Schomburgk gave to the British Museum contained 
not a few Reptiles from other localities, besides British Guiana, this specimen cannot be 
used as an argument against the above proposition. Under these circumstances I think it 
