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



455 



writers mention it as having been seen. If it occurs at all it is an 

 accidental straggler in Wisconsin. 



The nest is built in a tree. The eggs are three or four in number, 

 brownish white or whitish overlaid and mottled with madder brown, 

 and measure about 1.65 x 1.30 inches. 



Genus CIRCUS Lacepede. 



154. Circus hudsonius (Linn.). 

 Marsh Hawk. 



Distr. : North America, from Fur Countries to the Gulf, breeding 

 throughout its range; south in winter to Cuba and Central America. 



Special characters, adult male: General plumage, ashy gray; upper 

 tail coverts, white; belly and fianks, white, spotted with pale tawny 

 brown; wing, 13 to 15 inches; tail, over 8.25 inches. 



Female and immature male: Upper parts, brown, showing more 

 or less tawny rufous; upper tail coverts, white; under parts, tawny; 



Marsh Hawk. 



the belly and flanks, without bars or spots; wing, 13 to 16 inches; 

 tail, more than 8.25 inches long. 



The Marsh Hawk is a common summer resident in Illinois and 

 Wisconsin. It frequents the fields and open marshes and may be 

 recognized by its conspicuous white upper tail coverts. 



