192 BIRDS OF ILLINOIS. 



posterior border of the arm-wing, a smail spot on each side of the back (nearly con- 

 cealed by the closed wing), and a largor one on each side of the rump grayish 

 white. Lower half of the head (from about on a line with the eye) brownish buff, paler 

 on the chin and throat; chest light dingy brownish; remaining lower parts dingy white, 

 the sides brown, like the upper parts. 



Total length, about 17.50-19.00 inches; extent, 24.(K>-26.00; wing, 7.50-7.90 ; culmen. 1.50; 

 tarsus, 1.25-1.30; middle toe, 1.9(v-1.95. 



The Hooded Merganser is a common summer resident in Illi- 

 nois, inhabiting- wooded swamps and the dense timber along 

 streams, where it may be seen perching high in the lofty trees, 

 in knot-holes and other cavities of which it makes its nest. 



