Publisher's Synopsis
Excerpt from A Revision of the Forms of the Hairy Woodpecker (Dryobates Villosus (Linnaeus))
The adult female hairy woodpecker differs from the male only in somewhat smaller size and in the absence of the red occipital band. The juvenals of both sexes closely resemble the adults, except that nearly the whole top of the head is red.
In the measurements given under the various forms, none but perfectly typical specimens have been used, except in a few cases where such exclusion was rendered inadvisable by the smallness of the series available; for to include intermediates in measurement averages manifestly obscures the differences that really exist. The length of the tail is less reliable than other dimensions, as it is in all woodpeckers, since, on account of the unusual amount of wear to which the feathers are subject, it varies greatly. All measurements are in millimeters. In the lists of specimens examined, each locality is to be regarded as a breeding station unless specific statement is made to the contrary.
The following key may serve for an aid in distinguishing the various forms, in addition to setting forth their salient characters more clearly than do the descriptions.
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