Index 
6 74 
Western cricket, *156, 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, 
*591; developing, of cab¬ 
bage-butterfly, *11; of 
monarch butterfly, part 
of, showing scales, *360; 
muscles of, *5 
Wing-buds, development 
of, of giant crane-fly, 
*48 
Wings, 9; of butterflies, 
androconia from, *592; 
of Heteropters, showing 
venation, *196; of locust, 
development of, *42 
Winthemia, 4-pustuluta, 
*347 
Wood-boring beetle, giant, 
development of color- 
pattern in, *598 
Wood-borers, metallic, 
265 
Wood leopard-moth, 385 
Wood-nymph, *409, 410, 
457; moths, 370, 407 
Woolly apple-aphis, 179 
Woolly-bear caterpillars, 
*411 
Workers, 459 
Xenos, 294; sp., parasitiz¬ 
ing Polistes, *29 
Xestopsylla, 355; gallina- 
cea, 356 
Xiphidium, 154; attenu- 
atam, *154 
Xylina antennata, *402; 
grotei, *402; 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, 
*506; queen, nest of, 
*507 
Yellow-jackets, *505, 506 
Yellow-winged locust, *144 
Yolk, 37 
Ypsolophus pomatellus, 
*374; larva of, *373 
Yucca-borer, 441 
Yucca, -filamentosa, 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 Huminea, *200 
Zalysus spinosus, 214 
Zebra swallowtail, 448 
Zerena ccesonia, 446; eury- 
dice, 446 
Zeus era pyrina, 385 
Zodion, 337 
Zygsenid, venation of, *411 
Zygaenidae, Zygaena [Fabri- 
cius, 1775] ({vyaiva, zy- 
gcena, supposed to mean 
the hammer - headed 
shark), 370, 410 
Zygoptera (prob. £vy6v, 
zygum, yoke; nrepov, 
pterum, wing), 89; key 
to families of, 89 
