. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . The bag-worm, Thyridopteryx ephrmerirformis.—a, larva: b, male pupa: c, female, d, male moth ; e, bag of female cut open to show the mass of eggs ; f, caterpillar with bag in normal position ; g, young larvae with bags carried upright. drops ; the insect continues to feed, attaching the bag by means of silken threads to twigs when not moving about from place to place. Late in summer the larvae become full grown, and wander, sometimes leaving the trees altogether and fas
. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . The bag-worm, Thyridopteryx ephrmerirformis.—a, larva: b, male pupa: c, female, d, male moth ; e, bag of female cut open to show the mass of eggs ; f, caterpillar with bag in normal position ; g, young larvae with bags carried upright. drops ; the insect continues to feed, attaching the bag by means of silken threads to twigs when not moving about from place to place. Late in summer the larvae become full grown, and wander, sometimes leaving the trees altogether and fastening to fences or other shelter in the vicinity, and it is this habit that provides for the spread of the insects. When they have reached a place that suits them, the bags are firmly fastened, the opening is closed, and the caterpillars change to pupre. Shortly after the male emerges, and this is a black moth with transparent wings, short, feathered antennae, and an unusually long, tapering bod\-. It is quite active and seeks the female, which forms only an imperfect sort of pupa, and even in the adult condition is a non- descript without trace of wings and almost without antennae.
Size: 2624px × 1905px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsects, bookyear1906
