CORALLUS.—BOA. 18] 
advisable to keep the large-scaled form separate, as one with a distinct geographical 
range. I attach no weight to other characters which have been adduced as indicating 
the specific distinctness of the two forms. 
2. Corallus annulatus. 
Xiphosoma annulatum, Cope, Journ. Ac. N. Sc. Phil. viii. p. 129, t. 28. fig. 6 (1876). 
Corallus annulatus, Boul. Cat. Sn. i. p. 102. 
Hab. Costa Rica (Gadd). 
UNGALIA. 
Ungalia, Gray, Zool. Misc. p. 46 (1842). 
1. Ungalia moreleti. 
Tropidophis moreletii, Bocourt, Bull. Soc. Philom. ix. p. 113 (1885). 
Ungalia moreletii, Bocourt, Miss. Sc. Mex., Rept. t. 42. figg. 5, 5a, 5. 
Hab. GuateMaLa, Vera Paz (Mus. Paris). 
I have not seen an example of this snake. 
UNGALIOPHIS. 
Peropodum * g.un., Miller, Verh. nat. Ges. Basel, vi. p. 652 (1878). 
Peropodum, Bocourt, Miss. Sc. Mex., Rept. p. 522. 
Ungaliophis, Miiller, Verh. nat. Ges. Basel, vi. p. 141 (1882). 
Ungualiophis, Cope, Bull. U.S. Nat. Mus. no. 32, p. 56. 
1. Ungaliophis continentalis. 
Peropodum sp. n., Mill. Verh. nat. Ges. Basel, vi. p. 652, t. 1 (1878). 
Peropodum guatemalensis, Bocourt, Miss. Sc. Mex., Rept. p. 528, t. 31. figg. 5, 5a, 6 (cop. 
Miller). 
Ungaliophis continentalis, Mill. Verh. nat. Ges. Basel, vii. p. 142 (1882). 
Hab. Guatemata, Retalhuleu (Bernouliz). 
BOA. 
Boa, sp., Linneus, Syst. Nat. i. p. 373 (1760). 
Boa, Wagler, Syst. Amph. p. 169 (1830). 
1. Boa imperator. 
Boa constrictor (part.), Linn. Syst. Nat. i. p. 373 (1766) ; Schleg. Ess. ii. p. 373. 
Boa constrictor, Giinth. P. Z. S. 1860, p. 238; Salv. P. Z. S. 1861, p. 228. 
Boa constrictor, var. isthmica, Garman, N.-Amer. Rept. p. 9. 
* i.e, new genus of the family Peropodes. 
