33fi BARBOUR: ZOOGEOGRAPHY. 



I am inclined to believe that Werner's Dromicus w-nigrun belongs with 

 this species. It was described in 1909. (Hamb. jahrb. wiss. anst., 1909, 26, 

 beih. 2, p. 222). 



Alsophis antillensis (Schlegel). 



ScHLEGEL, Essai phys. Serp., 1837, 2, p. 214. 8tejneger, Rept. U. S. nat. mus. for 1902, 1904, p. 704, 

 fig. 171-174. 



Like Leimadophis exiguus, this form is found upon St. Thomas, St. John, 

 and Culebra. The specimens which Garman recorded from Haiti (Proc. Amer. 

 philos. soc, 1887, 24, p. 282) really belong to this species; and hence it must be 

 concluded that in some way they have gotten their locality label misplaced. 

 The species is, of course, in all probability not found on Haiti. 



Alsophis sanctae-crucis Cope. 

 Cope, Proc. Acad. nat. sci. Phila., 1862, p. 76. 



This species replaces A. antillensis, of St. Thomas, upon St. Croix; to which 

 island, so far as known, it is confined. 



Alsophis anomalus (Peter.s). 



Peters, Monatsb. Akad. wi.ss. Berlin, 1863, p. 2S2. Boulenger, Cat. snakes Brit, mus., 1894, 2, 

 p. 125. 



A very distinct species, confined to the island of Haiti. 



Alsophis leucomelas (Dum£ril et Bibron). 



Ddm^ril et BiBBON, Erpfit. gen., 1854, 7, p. 666. Bodlenger, Cat. snakes Brit, mus., 1894, 2, p. 123 



(part). 



Originally described from Marie Galante and Guadeloupe. Boulenger 

 adds the localities Antigua and Montserrat. No material representing this 

 species is in the collection, so that it is impossible to say whether or not the snakes 

 are the same on the different islands. The great variability which Boulenger 

 speaks of is very likely due to the differences in color in specimens from the vari- 

 ous islands. This character is often very diagnostic and unvarying among speci- 

 mens from a single island. 



Alsophis sibonius Cope. 

 Cope, Proc. Amer. philos. soc, 1879, 18, p. 275. 



Apparently confined to Dominica, this snake appears to warrant separation 

 from leucomelas of Dumeril and Bibron, with which Boulenger Cat. snakes Brit, 

 mus., 1894, 2, p. 124 has united it. The single specimen in the Museum agrees 

 closely with Cope's description. 



