. A dictionary of birds . (3) C. wolfi, thought by some authorities (and not withoutreason) to be but an accidental variety of the preceding (2), withits throat wholly blue,—a form of comparatively rare first of these is a not unfrequent, though very irregular visitantto England, while the second has appeared there but seldom, andthe third never, so far as is known. The affinity of the Bluethroatto the Redstart is undeniable ; but it is not much further removedfrom the Nightingale, and forms a member of that group whichconnects the so-called Families Sylviidm (Warbler) and Turdi
. A dictionary of birds . (3) C. wolfi, thought by some authorities (and not withoutreason) to be but an accidental variety of the preceding (2), withits throat wholly blue,—a form of comparatively rare first of these is a not unfrequent, though very irregular visitantto England, while the second has appeared there but seldom, andthe third never, so far as is known. The affinity of the Bluethroatto the Redstart is undeniable ; but it is not much further removedfrom the Nightingale, and forms a member of that group whichconnects the so-called Families Sylviidm (Warbler) and Turdidm(Thrush). BOAT-BILL, the Cancroma cochlearia of most ornithologists, anative of Tropical America, and the only species of its genus. Itseems to be merely a Night-HERON (Nycticorax) with an exaggeratedbill, so much widened as to suggest its English name, and its habits, 46 BOA TS WAIN—BOB-LINCOLN so far as they are known, confirm the inference derived from itsstructure. The wonderful Shoe-bird or Whale-headed Stork \. BOAT-BILL. (Balsenic&ps) is regarded by some authorities as allied to Cancroma;but the present writer cannot recognize in it any close affinity tothe Ardeidx. BOATSWAIjST, in seamens ornithology, is a name applied toseveral kinds of birds, and was perhaps first given to some of thegenus Stercorarius (Skua), though nowadays most commonly usedfor the species of Fhaethon (Tropic-bird), the projecting middlefeathers of the tail in each being generally likened to the marline-spike that is identified with the business of that functionary, butprobably the authoritative character assumed by both Skua andofficer originally suggested the appellation. BOAT-TAIL, a common name applied to certain North-Ameri-can birds of the genus Quiscalus, belonging to the Family Ideridai(see Grackle and Icterus), from the power they have of holdingthe tail in the shape of a boat with the concavity uppermost. BOB-LINCOLN, BOBLINK, and BOBOLINK, names given bythe English in North America
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