The periodical cicada in WVa. . PLATE I.—The Periodical Cicada, (CicadaseptmdecimJa, pupa; 6, pupa with back split open and adult coming out; c, the samewith adult almost out; d, empty pupa shell: e, adult wings spread; /, adultfemale in act of ovipositing: g, dwarf variety, showing comparative size. Allabout two-thirds natural sizes, (b and c after Riley ) THE PERIODICAL CICADA. 9 idly develop, and the body, wings and legs harden, and by thefollowing day it is ready to take its flight and enter upon itsshort aerial life, which is limited to about thirty days. Duringthis short period of its ex
The periodical cicada in WVa. . PLATE I.—The Periodical Cicada, (CicadaseptmdecimJa, pupa; 6, pupa with back split open and adult coming out; c, the samewith adult almost out; d, empty pupa shell: e, adult wings spread; /, adultfemale in act of ovipositing: g, dwarf variety, showing comparative size. Allabout two-thirds natural sizes, (b and c after Riley ) THE PERIODICAL CICADA. 9 idly develop, and the body, wings and legs harden, and by thefollowing day it is ready to take its flight and enter upon itsshort aerial life, which is limited to about thirty days. Duringthis short period of its existence, in its winged or adult stage,it feeds but little if at all, the males devoting their time duringthe day to Hying about an:l making a noise, while the voice-less females busy themselves depositing 14-1S, Mouthparts of adult periodical cicada, enlarged about 3|times. 14. beak or proboscis from side. 15 Piercing and sucking partwhich tits in a groove in the front of the proboscis as shown in 10. 17, tip ofpiercers from above, enlarged about 06 times, to show form of lancets aawhich together serve as a sheath for the inner part b, which appears tocorrespond to a tongue. IS, tongue from side. A SEVENTEEN YEAR AND A THIRTEEN YEAR RACE. In the southern or warmer sections of the U. S., the broodsor swarms of the insect appear at regular periods of thirteenyears, while in northern or colder sections, they appear everyseventeen years. Thus the broods of the former are referredto as belonging to a thirteen year race; while those of the lat:ter belong to a seventeen year race. TWO DISTINCT FORMS OF THE ADULT. Two distinct forms or varieties of the insect occur in all 10 WEST VIRGINIA EXPERIMENT STATION. broods or swarms of both the thirteen year and seventeen yearraces, which are easily d
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1800, bookdecade1890
