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Blue Yellow-Backed Warbler

(Fig. 97.) Ad. 8. - Upper parts grayish blue; a greenish-yellow patch in the middle of the back; greater and lesser wing-coverts tipped with white; outer tail-feathers with a white patch near the end; throat and breast yellow, more or less marked with pale rufous, a black, or bluish black, or rufous band across the breast; belly white; sides sometimes marked with rufous. Ad. q. - Similar, but the rufous color and band on the breast sometimes absent. Im. - Like the 9. L., 473; W., 2.40; T., 1.76; B. from N., 32.