6 9 4 



Index 



Western cricket, *is6, 157 



Wheat-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, 

 *5Qi ; developing, of cab- 

 bage-butterfly, *n; of 

 monarch butterfly, part 

 of, showing scales, *36o; 

 muscles of, *5 



Wing-buds, development 

 of, of giant crane-fly, 

 *48 



Wings, 9 ; of butterflies, 

 androconia from, *592 ; 

 of Heteropters, showing 

 venation, *ip6; of locust, 

 development of, *42 



Winthemia, 4-pustuluta, 

 *347 



Wood-boring beetle, giant, 

 development of color- 

 pattern in, *5g8 



Wood-borers, metallic, 

 265 



Wood leopard-moth, 385 



Wood-nymph, *4(X), 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- 

 cea, 356 



Xiphidium, 154; attenu- 

 atum, *I54 



Xylina antcnnata, *402 ; 

 grotei, *4O2 ; lacticinera, 

 parasitized larvae of, *486 



Xylocopas, 513 



Yellow-fever, mosquitoes 

 and, 630 



Yellow-jacket, communal 

 nest of the, *505 ; nest 

 of, Vespa sp., cut open 

 to show combs within, 

 *5o6; queen, nest of, 

 *507 



Yellow-jackets, *505, 506 



Yellow-winged locust, *I44 



Yolk, 37 



Ypsolophus pomatellus, 

 *374! larva of, *373 



Yucca-borer, 441 



Yucca filament osa, 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 fluminea, *2OO 

 Zalysus spinosus, 214 

 Zebra swallowtail, 448 

 Zerena cazsonia, 446 ; eury- 



dice, 446 



Zeuzera pyrina, 385 

 Zodion, 337 



Zygaenid, venation of, *4ii 



Zygaenidae, Zygsena [Fabri- 



cius, 1775] (fryaiva, zy- 



gana, supposed to mean 



the hammer - headed 



shark), 370, 410 



Zygoptera (prob. fvyov, 



sygum, yoke; jmpw, 



pterum, wing), 89; key 



to families of, 89 



