. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and lower California, with which are incorporated General ornithology, an outline of the structure and classification of birds, and Field ornithology, a manual of collecting, preparing, and preserving birds . with the inconstant formula A B X Y or A X Y, nude oil-gland, two caeca, noaftershafts, permanently reversed 4th digit, and 10 or 8 rectrices, in CucuUdce. The formerfamily is excl
. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and lower California, with which are incorporated General ornithology, an outline of the structure and classification of birds, and Field ornithology, a manual of collecting, preparing, and preserving birds . with the inconstant formula A B X Y or A X Y, nude oil-gland, two caeca, noaftershafts, permanently reversed 4th digit, and 10 or 8 rectrices, in CucuUdce. The formerfamily is exclusively Ethiopian ; the latter is cosmopolitan. Family CUCULID^: Cuckoos. Homalogonatous Picarice zygodactylous hy reversion of the fourth toe. The only otherNorth American birds with toes yoked in the same combination are Picidte and Psittaci, whosenumerous specialties will prevent any misconception regarding CuculidcB. The latter aredesmognathous in palatal structure, and homalogonatous, having the ambiens and three or allfour of the other leg-muscles used for classificatory purposes; in these important respects dif-fering from all birds previously treated in this work. There are two carotids. The syringesvary from tracheobronchial through pseudobronchial to bronchial, paired. The oil-gland isnude, but cjeca are present, and the plumage is not aftershafted. The family is a large and : CUCKOOS. 603. important one. It comprehends quite a number of leading forms showing certain modificationsof the syrinx or syringes, of the pterylosis, of the hind claw, and even of the myological for-mula. These correspond in great measure with certain g^^^^s^-^a^!*^ ^^^=7- ^. ^^ir-^ geographical areas of faunal distribution, and are generally r~Tf^ ^^^^^ - â *,/!?*.. held to constitute the subdivision of thefamily is still in such an un-satisfactory state, that I amfurtunate in being required totreat critically of only theNorth American forms, whichinclude representati
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectbirdsnorthamerica
