The periodical cicada in WVa. . —Wound seventeen years old, prevented from healing by slow growthof twig which was in the top of an old apple tree. Evidence is also foundthat the wound had been aggravated by the woolly aphis, (Sketchedfrom specimen collected January, 1898.) about six to eight weeks from the time they are deposited, andthe young cicada larvae emerge from the twigs and fall to theground. They then burrow beneath the surface and enterupon their long and menial existence in the ground, feeding on THE PERIODICAL CICADA. 7 the liquids of roots and possibly subsisting on such nutrime
The periodical cicada in WVa. . —Wound seventeen years old, prevented from healing by slow growthof twig which was in the top of an old apple tree. Evidence is also foundthat the wound had been aggravated by the woolly aphis, (Sketchedfrom specimen collected January, 1898.) about six to eight weeks from the time they are deposited, andthe young cicada larvae emerge from the twigs and fall to theground. They then burrow beneath the surface and enterupon their long and menial existence in the ground, feeding on THE PERIODICAL CICADA. 7 the liquids of roots and possibly subsisting on such nutrimentas can be obtained from the soil itself. They change their posi-tion from time to time, and may enter the earth for a distanceof eight or ten feet, or more. During the spring of the fifteenthand sixteenth years, great numbers of the full grown young(as was observed near the Experiment Station in April, 1895and 1896,) may be found near the surface, and a few individualsmay emerge during May and June of the sixteenth year and. Egg cavities showing arrangement of eggs. (3—Side view a showing how the entrance to the cavity is closed withwood fibers. 7—Pair of cavities with fiber covering removed, showing arrangementof eggs in double row ar, a, and empty cavity showing partitions betweeneggs at b 8—Showing position of ovipositor (Fig. 13) in process of excavatingcavity. change to the winged or adult forms. Early in April of the 17thyear, the pupae commence to make preparations to emergefrom the ground by excavating burrows or exit galleries to thesurface. These exits are completed by the last week in they only extend to the surfaee and are kept openfrom a depth of a few inches to a foot or more, but in some soilsthese exit holes are extended four or five inches above the 8 WEST VIRGINIA EXPERIMENT STATION. surface by means of clay carried up from the subsoil. Thepupae (Plate I, a) come from the ground in the evening and atnight, usually between sundown and
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1800, bookdecade1890
