TOPOGRAPHY AND DIS1RIBUTION 37 



according to their estimated preference for such regions as Iowa 

 affords. It is intended to represent the character of the country, 

 whether timbered or treeless, where the listed species are most fre- 

 quently found. 



* Nesting. 



t Permanent resident. 



j Occasional in winter. 



Usual every winter. 



A Accidental. 



Total of Iowa species 33. 



Total of subspecies 7. 



Total of species and subspecies 40. 



A Area of greatest abundance Northward, coming south in 

 winter. 



B Area of greatest abundance Eastward, extending west- 

 ward. 



C Area of greatest abundance Southward, coming north in 

 summer. 



D Area of greatest abundance Westward, extending east- 

 ward. 



E Area of greatest abundance Iowa and contiguous states, 

 or as abundant here as elsewhere. 



Of these forty, twenty-three have been found nesting in Iowa, 

 six rarely, eight unusually, and nine commonly. Eleven are rare, 

 being accidental stragglers in the state, or if formerly more com- 

 mon, now occasional only. 



