INTRODUCTION. 
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Genus Herodias. 
240. Herodias alba ............ Vol. IV. PI. XXII. 
Great White Egret or White Heron. 
Quite an accidental visitant, arriving at very uncertain periods. 
241. Herodias garzetta ........... Vol. IV. PI, XXIII, 
Little Egret. 
This, like the last, is merely a straggler to Britain. 
Genus Bubulcus. 
242. Bubulcus russatus ........... Vol. IV. PI. XXIV. 
Buff-backed Heron. 
An accidental visitor. 
Genus Buphus. 
243. Buphus comatus ........... Vol. IV. PI. XXV. 
Squacco Heron. 
The visits of this bird are very infrequent, and its appearance not to be depended upon. 
Genus Nycticorax, 
244. Nycticorax griseus . , . . • \ • • * • • • XXVI. 
Night-Heron. 
This bird must be considered among our accidental visitors. 
Genus Botaurus. 
245. Botaurus stellaris .......... Vol. IV. PI, XXVII. 
Bittern. 
Formerly a common stationary form in our marshes and fens ; now seldom seen, and mostly in winter. 
246. Botaurus lentiginosus .......... Vol. IV. PI. XXVIII. 
American Bittern. 
The frequent occurrence of this bird in the British Islands demands a place for it in our avifauna ; and 
hence I have given a figure of it. 
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