. The butterflies of the eastern United States; for the use of classes in zoology, and private students. -^STivA, is often of largersize of wings, and thewings are thinner, andpurer white on theupper side, than inhiemalis(()). Alsothe base is less obscured,and the costa, apex, and outer margin not at all. On theunder side it is either white or delicate yellow; the veinsof both wings but scantily edged with brown scales, andoften not at all over considerable areas. The females have the basal and apical areas pale gray,and not infrequently there is a trace of the spot of Napion up
. The butterflies of the eastern United States; for the use of classes in zoology, and private students. -^STivA, is often of largersize of wings, and thewings are thinner, andpurer white on theupper side, than inhiemalis(()). Alsothe base is less obscured,and the costa, apex, and outer margin not at all. On theunder side it is either white or delicate yellow; the veinsof both wings but scantily edged with brown scales, andoften not at all over considerable areas. The females have the basal and apical areas pale gray,and not infrequently there is a trace of the spot of Napion upper median interspace; sometimes also a trace ofthe second spot, and of the gray bordering to the hindmargin of fore wings. The veins beneath are moreedged with brown scales than in the male. The shoul-ders of hind wings are of a ve7y pale yellow, and oftenthere is no color at all. New England to Michigan. The eggs, represented in Fig. 27, are somewhat pear-shaped, pale greenish white in color, marked with about PieriB Nap?, winter form, Oleracea-hiemalis:a, larva. EASTERN UNITED STATES 113 Fig. p. Napi, form Oleracea; egg, X27. fifteen sharp longitudinal ridges with cross-lines about .05 of an inch. The young larva is of a glassy white, thinly clothedwith fine short hairs. As with several other species, theegg-shell from which it emerges forms thefirst meal of the young larva. The mature larva is about incheslong, of a pale green color, with a darkerdorsal line, the entire surface covered withfine short whitish hairs. The chrysalis is of a greenish or whitishcolor finely speckled with black, and shapedmuch as the other species. The larva, when ready to pupate, leavesthe cabbages and seeks some protected placeon the under side of a board or a fence-rail,where it spins its button and loop of silk and changesto a pwpa. This habit is not confined to this species,but is common to the rest of the genus occurring in theeastern United States. 13. PlERIS YlRGIN
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbutterflies, bookyear
