CATALOGUE OF VERTEBRATES. 563 



State as the ' yellow mocker/ a name to which it is in no way 

 entitled, as it has no trace of mimicking in its varied notes. 

 Feeds largely upon insects, and is very active and eager in the 

 pursuit of spiders, frequently lying in wait for the large spiders 

 having nests in to the chat inaccessible places. They have 

 generally all disappeared by the middle of September." 



SYLVANIA, Nutt. 



(Myiodioctes, Aud.) 



S. mitrata, Gmel. Hooded (Flycatching) Warbler. Yellow-masked 

 Warbler. 



Bright yellow olive ; crown and neck jet black, enclosing a 

 broad golden mask ; bright yellow below ; white blotches on 

 tail ; female with olive instead of black. Length, 5 inches ; tail, 

 2 1 inches. 



" Rare. Arrives in May, and prefers apparently evergreen 

 trees. Re-appears in September and makes a longer stay. 

 Always remains high up among the branches, so is difficult to 

 detect." 



S. pusilla, Wils. Wilson's Warbler. Green Black-capped Flycatching 

 Warbler. Green Black-cap Flycatcher. 



Clear yellow olive ; crown glossy black ; remainder of head 

 and under parts bright yellow ; wings and tail unblotched ; 

 female with less black. Length, 4| inches ; tail, 2^ inches. 



"Less rare than the preceding, and unlike it in habits, as it 

 prefers dark, swampy thickets. Has been seen in July, and so 

 may possibly breed here. Re-appears in September for a short 

 time." 



S. canadensis, L. Canadian (Flycatching) Warbler. Canada Fly- 

 catcher. 



Bluish ash ; crown speckled with black ; under parts clear 

 yellow ; under tail coverts white ; lores black, continued under 

 eye, and as a chain of black streaks down side of neck, encircling 

 breast like a necklace ; wings and tail plain ; female with less 

 black. Length, 5^ inches ; tail, 2|- inches. Very handsome. 



" Most abundant of the three species. Arrives in May, and 

 prefers oak woodlands to the open country. None remain dur- 

 ing the summer. Re- appear in September." 



