THE MIGRANT SHRIKE. 



291 



way to account for the considerable diversity wliich we find in specimens, is 

 simply to recognize this state as a meeting ground of two forms which have 

 attained their maximum differentiation elsewhere, — ludovkiamis in the South, 



Taken near Columbus. Photo bv the Author. 



THE SHRIKE'S FORTRESS. 



THE TREE IS A HONEY-LOCUST, AND A NEST OF THE SHRIKE APPEARS ON THE RIGHT. 



and excubitorides in the West — and without attempting to assign subspecific 

 value to the various phases as they appear. Hence, however we may regard, from 



