THE MIGRANT SHRIKE. 291 
way to account for the considerable diversity which we find in specimens, is 
simply to recognize this state as a meeting ground of two forms which have 
attained their maximum differentiation elsewhere,—/udovicianus in the South, 
Taken near Columbus. Photo by 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 mav regard, from 
