694 



Index 



Western cricket, *I56, 157 



Whcat-thrips, 221 



Wheel-bugs, 203 



Whirligig-beetle, 252, *257 



Whirligigs, 255 



White ants, 99 



White-lined sphinx, 435 



Wing, of butterfly, ar- 

 rangement of scales on, 

 *59i ; developing, of cab- 

 bage-butterfly, *ii; of 

 monarch butterfly, part 

 of, showing scales, *36o; 

 muscles of, *S 



Wing-buds, development 

 of, of giant crane-fly, 

 *48 



Wings, 9 ; of butterflies, 

 androconia from, *SC)2 ; 

 of Hetcropters, showing 

 venation. *I96; of locust, 

 development of, *42 



Winthcmia, 4-pustuluta, 

 *347 



Wood-boring beetle, giant, 

 development of color- 

 pattern in, *5g8 



Wood-borers, metallic, 

 265 



Wood leopard-moth, 385 



Wood-nymph, *409, 410, 

 457; moths, 370, 407 



Woolly apple-aphis, 179 



Woolly-bear caterpillars, 

 *4ii 



Workers, 459 



Xenos, 294; sp., parasitiz- 

 ing Polistes, *29 



Xestopsylla, 355 ; gallina- 

 cca, 356 



Xiphidium, 154; attenu- 

 atuiii, *I54 



Xylina antcnnata, *402; 

 grotci. *402 ; lacticinera, 

 parasitized larvx of, *486 



Xylocopas, 513 



Yellow-fever, mosquitoes 

 and, 630 



Yellow-jacket, communal 

 nest of the, *50S ; nest 

 of, Vespa sp., cut open 

 to show combs within. 

 *So6 ; queen, nest of. 

 *507 



Yellow-jackets. *S05, 506 



Yellow- winged locust, *I44 



Yolk, 37 



Ypsotoplius pomatcllus, 

 *374 ; larva of, '373 



Yucca-borer, 441 



Yucca filamciitosa, specifi- 

 cation of, for insect pol- 

 lination, 576 



Yucca, pronuba moth rub- 

 bing pollen down a stig- 

 matic tube of. *578 ; pro- 

 nuba moth laying eggs 

 in ovary-tube of, *577 



Zaitha fluminca, *200 

 Zalysus spinosus, 214 

 Zebra swallowtail, 448 

 Zcrcna cccsonia, 446; cury- 



dicc, 446 

 ZcHzcra pyrina, 385 

 Zodion, 337 



Zygsnid, venation of. *4II 

 Zygscnidse. Zygaena [Fabri- 

 cius, 1775] (s'l'}'"!", :y- 

 gccna, supposed to mean 

 the hammer - headed 

 shark), 370, 410 

 Zygoptera (prob. 'yy/iv, 

 zygxim, yoke; -ripov, 

 ptcrum. wing), 89; key 

 to families of, 89 



