SYLVICOLID^. 



163 



teristies as they appeared to him from a purely microscopical point 

 of view. 



1. GlossvptUn rnftcoUift. Jamaica. 



2. Certhiola baiuimentds. Nassau. 



3. CSdorophanes cUricapiVa. Trinidad. 



4. Dacnis cayana. " 



5. Perissnglossa tigrina. 



6. Dendroica striata. Nassau. 



7. Hflmintkaphaga cdaia. Arctic America. 



8. TeretTiitis fornsii. Cuba. 



9. Yireoiariatuia. Nassau. 



The following figures represent one branch of the bifurcated tip 

 of each tongue more highly magnified. The references are the same 

 as in the preceding figures. 



Nos. 2, 3, 4, and 6 were drawn from alcoholic specimens ; 1, 5, 7, 8, and 9 from tongues 

 removed from the dried skin, and therefore perhaps not perfectly accurate. 



" The base of the tongue is bifid and armed with teeth pointing backward 

 to prevent the escape of food. The largest teeth are at the extremities of the 

 two points. In Certhiola, Perissoglossa, Dendroica, and Teretristis the teeth 

 are all sharp, with the intermediate teeth nearly as large as the terminal 

 ones, and there are two or three teeth on the outer sides of the points. In 

 Glossiptila there is only one tooth on these outer edges. Vireo differs from 

 all the rest in having a broad and shallow excavation between the two points, 

 which are short, stout, and blunt ; and the edge of this excavation is armed 

 with very minute, equal teeth, while there are no true teeth on the outer 

 edges of the points." — Stimpson. 



