Jan., 1909. Birds of Illinois and Wisconsin — Cory, 



227 



Northern Shrike. 



Upper plumage, ash gray or gray tinged with buff; under parts, 

 ashy white, the feathers showing numerous faint narrow black bars; 

 a black streak from bill through the eye; wing, more than 4.15 inches 

 long. [aduus borealis. 



Northern Shrike. 

 See No. 291. 



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; tarsus, flattened and sharp behind, not rounded as in front; 

 plain colored birds, usually greenish or grayish, but often showing a 

 faint wash of yellow on under parts; tail, always without white spots. 



GROUP 1. Wing, less than 2.37 inches long. 



Crown, grayish; orbital ring, dull white; no yellow in front of eye. 



Vireo bellii. 

 Bell's Vireo. 



See No. 299. 



