BLUE-BREASTED WARBLER. 
69 
An opinion prevails with Temminck, Meyer, Nilson, and 
some other naturalists, that there exist two distinct varieties 
of the Blue-throated Warbler; one of these is the species 
above described, from which the other differs constantly, in 
having a rufous, instead of a white spot in the middle of the 
breast. This latter variety, with the rufous speculum, is 
considered by Temminck to inhabit, chiefly, the most north¬ 
ern of the countries above mentioned : the other, or the 
species with a white speculum, as chiefly inhabiting the warmer 
parts of the Continent, and rarely penetrating further north 
than Denmark. 
The egg marked 58 is that of the Blue-breasted Warbler. 
