FAMILY VIREONIDA. — VIREOS. Zit 
FAMILY VIREONID =. 
Vireos. 
Upper mandible, with very small hook at tip; first primary, very short 
in some species, in others nearly as long as second; toes, joined at base. 
Plain colored birds, usually greenish or grayish, but often showing a faint 
wash of yellow on underparts; tail, always without white spots. 
Group 1. Wing, less than 2.37 inches long. 
Crown, grayish; orbital ring and lores, dull white. Rarely occurs east of 
Illinois. 
Bell’s Vireo. 
Vireo bellii. 
See No. 480. 
Crown, grayish, often tinged with olive; orbital ring and lores, 
yellow. 
White-eyed Vireo. 
478 Vireo noveboracensis, and races. 
See No. 478. 
