The periodical cicada in WVa. . de 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
The periodical cicada in WVa. . de 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 ten oclock, and pro-ceed to the nearest upright object, which may be a tree, the. Detail drawings of ovipositor of female periodical cicada. 9, ovipositor from side. a, lower or ventral part of tip which comes in contact with the wood. 10, ovipositor from below, with outer parts separated to show positionof inner lancet, b, through which the eggs pass and are placed by it in po-sition. 11, lancet tip of ovipositor from below, showing special arrange-ment of point and edges for gouging out the cavity, act, outer pair oflancets, b, inner lancet. 12, ovipositor from above, aa, outer parts which together form asheath for the inner lancet tube showing corrugated trough-like groovethrough which the eggs pass to tip. 13, lancet tip of ovipositor fromabove, showing special arrangement for adjusting the wood fibers andforming the egg cavity, aa, outer pair of lancets, bb, inner lancet. Figs. 9, 10, 12 are enlarged a little more than 6 times; 11 and 13 are en-larged about 33 times. side of a building, fence, post, or weed stem, anything in fac
Size: 1935px × 1291px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1800, bookdecade1890
