. The birds of Illinois and Wisconsin . * For directions for measurement, see page 21. 122 Field Museum of Natural History — Zoology, Vol. IX. ■^i^^ •) Bill, as illustrated; throat, black; crown, I black and no rufous brown on sides (Chick- ■ adee), or forehead, black; sides, with rufous brown (Titmouse). Family PARID^ and page

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