DIKEUTOKY TO BIRDS OF EASTERN NORTH AMERICA. 283 



alarm, a whistling '"''Cluck.'''' Frequents woodlands. Nests 

 on ground; eggs, unspotted. 



3. OLIYE-BACKED THRUSH, H. swainsonii. 7.00: 

 uniform olive above; eye ring, sides of head, and breast, red- 

 dish-buff ; spots beneath, broadly triangular, fig. 379. Breeds 

 in eastern N. A. from the mountains of Penn. and N. Y., and 

 northern N. E., northward; winters in S. A. ; south in Sep. 

 and Oct. ; north in April and May. Song, differs from 2 in 

 being lower in scale; alarm like 2. Frequents heavy wood- 

 lands. Nests in low trees or bushes; eggs, spotted. 



4. GRAY-CHEEKED THRUSH, H. aliciae. Differs 

 from 3 in having the eye ring and sides of head grayish- white 

 and the breast with Fig. 380. 



little or no tingeing of 

 buff". Breeds in east- 

 ern N. A. chiefly 

 north of the U. S. ; 

 winters in Central 

 America; south in 

 Sep. and Oct. ; north 

 in May. Common, 

 frequenting wood- 

 lands and copses. 

 Song, as heard here 

 in West Newton, al- 

 most exactly like 

 that of 5, but rather lower. 



4*. BICKNELL'S THRUSH, H. a. bicknelli. Differs 

 from 4 in being smaller. Breeds on the mountains of the 

 northeastern States and Nova Scotia. Migration as in 4. 

 Song (as heard in West Newton, Mass.), begins with two or 

 three notes similar to those of 1, and terminates. like 4. 



5. WILSON'S THRUSH, H. fuscescens. 7.00; reddish- 

 tawny throughout above ; white beneath ; eye ring, sides of 

 head and breast, pale buff ; spots confined to upper breast and 

 very pale reddish-brown, fig. 380. Breeds from northern N. J. 



CC, W, a, 5. 



