2ia FIRST LESSONS IN ZOOLOGY 



remaining almost always on the ground. The common 

 tree-trog of the l^astcrn States is green, gray, or brown 

 above, with irregular dark blotches, and yellow below. 

 It croaks or trills, especially at evening or in damp 



!■'[(;. ly'i. — Tlir titter sal.unaiMk-r. (From Juiikins ami Kellogg.) 



weather. Pickering's tree-frog makes the "first note of 

 spring" in the l-Lastern States. This is the one most 

 frcquentl)' heard in the autumn, too, but " its voice is less 

 vivacious than in the spring, and its lonely pipe in dry 

 woodlands is always associated with goldenrods and asters 

 and falling lea\'es. " The tree-frogs of North America 

 lay their eggs in the water on some fixed object like an 

 aquatic plant, in smaller packets than those of the true 

 frogs, and not in strings as do the toads. 



Fig. 177. — The Western lirowii eft, or satimamlcr, J~>i\'mri/y/„s /orosi/s. 

 (I''rom livili'^ s|ieeinu-n. ) 



The salamanders (figs. i/Cand 177) are batrachians, with 

 the body not short and tailless as in the frogs and toads 



