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Key to the Species, 
A. Bill narrow at the base; about one-third 
of the length, which is about 25 mm. . . . . . , H, helcheri^ p. 224. 
B. Bill broader at the base ; about one-half of 
the length, which is about 25 mm. . . H, desolatus 7mttingleyiy p. 226. 
