. Animal life in field and garden . little finger is for the louse a long journeyfraught with perils not lightly to be faced, a fewsteps forward to make room in the rear for somefifty children as fast as they are brought into theworld being about all that the boldest of these crea-tures dares to undertake. But plant-lice of the lastgeneration of the year have wings and lay eggswhich in the spring renew the race annihilated bythe cold of winter. These winged lice are no timidstay-at-homes like the others: they gladly quit thenatal leaf to see a bit of the world. It is their busi-ness to travel
. Animal life in field and garden . little finger is for the louse a long journeyfraught with perils not lightly to be faced, a fewsteps forward to make room in the rear for somefifty children as fast as they are brought into theworld being about all that the boldest of these crea-tures dares to undertake. But plant-lice of the lastgeneration of the year have wings and lay eggswhich in the spring renew the race annihilated bythe cold of winter. These winged lice are no timidstay-at-homes like the others: they gladly quit thenatal leaf to see a bit of the world. It is their busi-ness to travel hither and yon and lay their eggs inmany places so that in the following spring all plants 381 382 ANIMAL LIFE IN FIELD AND GARDEN shall have their share of lice, and it is to fulfill thisduty that they are expressly provided with of these traveling plant-lice, dense enough toobscure the light of day, have been observed. Many other insects have, like the plant-louse, astraight, pointed sucker which they plunge into the. Periodical Cicadaa, pupa; 6, cast pupa-shell; c, fully developed insect; d, puncturedtwig; e, two eggs, (a, h, c, natural size; d, e, enlarged.) substance they wish to drain of its juice, and whichthey hold against the breast when not in use. Thecicada furnishes us a very good example, as do alsothe large bugs found on trees and on many cabbage feeds two of them: the harlequin cab-bage-bug, which is red with numerous black spots,and still another cabbage-bug of a bluish-green colorwith white or red spots. SAP-SUCKERS 383 Bugs of this class have four wings, the upperpair covering the other pair when in repose. Theforward half of each upper wing is hard like thebeetles wing sheaths, but the other half is mem-branous and of fine texture. This structure makesthem half sheaths for protection and half wings forflying, and it is because of this peculiarity that in-sects of this sort are called hemiptera, or half-wingedcreatures. The cicada is a
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