INDHX 
Wasps, social, 161. 
Water - beetle (illus.), 146; bug, 
giant (illus.), 141. 
Whippoorwill (illus.), 203. 
Woodpecker, Californian, feeding 
habit of (illus.), 128, 129. 
Xiphias gladius, metamorphosis 
of (illus.), 99. 
329 
Yellow-jacket (illus.), 162. 
Yolk, 80. 
Young, adaptations for defense of, 
137; care of the, 250, 257; num- 
ber of, 61. 
Zoea, 97. 
Zodgeography, 272. 
Zodélogy, systematic, 64. 
(15) 
THE END 
