. The insect book [microform] : a popular account of the bees, wasps, ants, grasshoppers, flies and other North American insects exclusive of the butterflies, moths and beetles, with full life histories, tables and bibliographies. Insectes; Insects. ill I f ^ The Bot-Flies the flies appearand arc immediately iittracted to cattle, laying their egf»s upon the legs, especially just above the hoof, which explains the southwestern name "heel ; The eggs are occasionally laid on other parts of the body but the neighborhood of the hoof is preferred. They are attached to the hair by means
. The insect book [microform] : a popular account of the bees, wasps, ants, grasshoppers, flies and other North American insects exclusive of the butterflies, moths and beetles, with full life histories, tables and bibliographies. Insectes; Insects. ill I f ^ The Bot-Flies the flies appearand arc immediately iittracted to cattle, laying their egf»s upon the legs, especially just above the hoof, which explains the southwestern name "heel ; The eggs are occasionally laid on other parts of the body but the neighborhood of the hoof is preferred. They are attached to the hair by means of a clasp- ing projection and usually from four to six arc laid together. The animal licks its legs and the larva at once hatches and is carried down into the a'sophagus, the walls of which it penetrates by means of its strong spines. It then molts and becomes smooth and for several months wanders through the con- nective tissues of the cow, between the skin and the flesh, penetrat- ing gradually along the neck and ultimatelv reaching a point beneath the skin on the back of the animal. The larva then molts again, becomes more spiny, and biircs a hole through the skin, placing its anal spiracle near the orifice in order to get air. During its earlier lite it probably breathes by an cn- dosmolic method as do the larva- of the parasitic Hymenoptcra and in fact much as do the aquatic larv;e of certain other insects. The larva now develops rapidly, living upon the pus and bloody scrum which is produced by the of its spiny skin. It inolts .md is then more than an inch long .ind yellowish- white in color. 11 works its way out of tht minute orifice which it enlarges .ind drops to the ground where it hardens, the skin becoming the protection for the which is liirmed uithin. In three to six weeks the adult llv escapes by pushing olf the cap .it one end of the Kip. .S6—Hypoilcmia lincata. rgns. ( AjU-r Kttey. "*
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsects, bookyear1901
