Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . spots verymuch reduced, sometimes altogether wanting, but on the hindwings the space between the faint series of yellow spots and theouter lunules is beautifully powdered with metallic blue butterflies lay their eggs on carrots, parsley, and otherplants of the same natural family, and from them hatch bright THE INSECT WORLD. 251 green caterpillars with broken black bands. A peculiarity ofthis kind of caterpillar is that when touched or irritated in anyway it shoo
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . spots verymuch reduced, sometimes altogether wanting, but on the hindwings the space between the faint series of yellow spots and theouter lunules is beautifully powdered with metallic blue butterflies lay their eggs on carrots, parsley, and otherplants of the same natural family, and from them hatch bright THE INSECT WORLD. 251 green caterpillars with broken black bands. A peculiarity ofthis kind of caterpillar is that when touched or irritated in anyway it shoots out from between the segments close to the head aforked, orange-colored process, which emits a very disagreeableodor, and this is its only means of defence. No trace of the pro-cess is visible when the insect is at rest, and the horns are with-drawn just as soon as irritation ceases. When the caterpillar isfull grown it leaves the plants upon which it has fed and travelsto any convenient point in the vicinity where it can pupate. Thispupa, or chrysalis, is fastened to a little silken pad by the tail, Fig. Papilio aslerias.—Mature larva and pupa. but is also sustained by a silken band in front of the middle, sothat it is said to be girthed, and this same type we have in all themembers of this family. These caterpillars are rarely abundantenough to become troublesome, but if they are, hand-picking is,perhaps, as good a remedy as any. They are quite prominent,and, therefore, easily and rapidly gathered, checking their injuryimmediately and completely. When they are small, sprayingwith the arsenites will answer, provided it be done thoroughly. Another species is P. philenor, of about the same size, black,without the yellow spots through the centre, but with the uppersurface overlaid with greenish, powdery scales, which give theinsect a metallic lustre in certain lights, and this varies accordingto the angle at which the light strikes the wings. The cater-pillars feed upo
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
