INSECTIVOR^^. 
Family SYLVIADjE. 
Genus Sylvia, f Latham. J 
BLACK-THROATED WARBLER. 
Sylvia virons. 
Sylvia vivens, Latham. Wilson. 
“ “ Audubon ; Plate 399. 
“ “ Gatke; in Naumaunia, 1859, 
p. 425. 
Sylvicola virens, SwAiNsoN. Bonaparte; 
Birds of E. and A., p. 22. 
Syeci/ic Characters . — Plumage above yellowish olive green; 
throat black, the feathers in winter being edged with yellowish 
white; first and fourth pi’imary of equal length, the second and 
third a trifle longer. Length five inches. 
The lonely rocky island which rears up its bold 
red-looking front to the eyes of the traveller, as he 
steams near the mouth of the Elbe, on his way to 
Hamburg, seems destined to be a rich field of dis- 
covery to the European ornithologist. So many new 
forms have lately turned up in Heligoland, that the 
celebrated Professor of Brunswick — Blasius, has been 
induced to make an excursion thither, and examine 
for himself the treasures which have been collected 
