1898.] NATURAL SCIENCES OF PHILADELPHIA. 87 



86. Parus atricapillus. Black-capped Chickadee. 



Abundant in the woodland. 



87. Turdus mustelinus. Wood Thrush. 



A common species and generally confined to the deep woods. A 

 nest containing young nearly ready to fly was discovered, however, 

 June 18, 1895, situated in a young maple tree on the border of 

 the woods within a few rods of the house. The female bird was ex- 

 ceedingly tame, allowing approach within a foot of the nest, but 

 usually this species lacks much of the tameness and confidence 

 which so characterizes it in the more densely populated portions of 

 the country. 



88. Turdus fuscescens. Wilson's Thrush. 



Very abundant in dense, swampy woodland throughout the 

 county. Owing to its shyness and the inaccessibility of the locali- 

 ties which it generally inhabits, the bird is very difficult to 

 approach, but its presence is always betrayed by its wild bell-like 

 notes, which may be heard at all hours of the day, but which sound 

 the sweetest in the early morning and about sunset. It is almost 

 impossible to imitate the song on paper, but the syllables " ta-weel'ah, 

 ta-weel'ah, twil'ah, twil'ah," mentioned in Baird, Brewer and 

 Ridgway's North American Bird* (Vol. I, p. 9), convey to my ear 

 the most accurate description of it which I have seen. After careful 

 observation and study, I am prepared to say that this is one of the 

 most plentiful of the Turdidce in Susquehanna County, surpassing 

 in abundance both T. mustelinus and 'pallasii. 



89. Turdus aonalaschkae pallasii. Hermit Thrush. 



Tolerably common wherever the hemlock remains uncut, but 

 hardly as plentiful as T. mustelinus, being absent in many of the 

 localities where the latter is comparatively common. I have, on 

 many occasions, however, observed the two species singing almost 

 side by side, and fully agree with other observers that the song of 

 the Hermit is considerably superior to that of the Wood Thrush, 

 possessing as Dr. Dwight remarks, " a ringing sweetness that is only 

 matched in part by the latter." 



90. Merula migratoria. American Robin. 



Common everywhere throughout the county, except in the deep 

 woods. 



