THE BAHAMA ISLANDS 357 



Columbigallina passerina bahamensis (Maynard). 1 Greater Antilles 



Speotyto cunicularia cavicola Bangs. T 



Speotyto cunicularia bahamensis Cory. [.Haiti 



Pyrrliulagra violacea (Linne). 



Saurothera bahamensis Bryant. 

 Saurothera andria Miller. 

 Centurus superciliaris nyeanus (Eidgway). 

 Centurus superciliaris blaJcei (Eidgway). 

 Centurus superciliaris baJiamensis (Cory). 

 Riccordia ricor dii ceneoviridis (Palmer & Eiley). 

 Pitangus bahamensis Bryant. 

 Myiarchus lucays-iensis (Bryant). 

 Blacicus baJiamensis (Bryant). 

 Mimocichla plumb ea (Linne). 

 Dendroica petechia flaviceps Chapman. 

 Dendroica pityophila baJiamensis Cory. 



Leaving out of consideration two forms of doubtful standing, eight of 

 doubtful or fortuitous origin, and three possibly derived from Cozumel Island, 

 Yucatan, or of fortuitous origin, we have fourteen forms that have reached 

 the Islands from the eastern United States by way of Florida and seventeen 

 that have reached them from the Greater Antilles, the majority by way of 

 Cuba. The seven species of Geothlypis have very probably been derived from 

 one " original stock " form, as stated above, which lessens the value of Florida 

 as a derivative center and increases that of Cuba. Now reducing the forms 

 that have probably been derived from a single stock-form would give Florida 

 seven and Cuba nine, but the forms derived from Cuba have gone further in 

 specialization than the Florida forms, which would seem to indicate that the 

 Greater Antillean forms were the first to colonize and that the Florida ele- 

 ment is, comparatively speaking, of recent introduction. This would seem, 

 it appears to me, to indicate that the Greater Antilles are of a much more 

 ancient formation than southern Florida. The fact must not be lost sight of 

 that several birds of extreme southern Florida, where the same conditions 

 are said to prevail as in the Bahamas, have reached there probably by 

 way of the Bahamas and not vice versa, namely : Columba leucocepJiala 



