412 



ZOOLOGY 



Woodchuck, 320. 

 Wood frog, 266. 

 Woodpeckers, 301. 

 Wood-tortoise, 276. 

 Wood-thrush, 286. 

 Wood- warblers, 287. 

 Worms, tube-forming, 102. 

 Wrens, 287. 



Xylotropidae, 23, 41. 



Yellow bird, 285. 

 Yellow warbler, 288. 

 Yoldia, 187, 188. 



Zebra, 327. 



Zebra swallow-tail, 18. 

 Zygsenidae, 41. 

 Zygodactyla, 212. 



