. Economic entomology for the THE INSECT WORLD. become so, there would be no trouble in protecting the plants by means of the arsenites. Now we reach the family GeometridcB, in which the larvae lack all save one or at most two pair of false or abdominal legs. In moving they first extend the body to its full length, then bring the posterior end close to the front legs, looping the body in the centre, then stretch out again and repeat the procedure, whereby they have gained the names '' span-worms," " loopers,'' or ''measuring-worms," and, indirectly, the scientific term
. Economic entomology for the THE INSECT WORLD. become so, there would be no trouble in protecting the plants by means of the arsenites. Now we reach the family GeometridcB, in which the larvae lack all save one or at most two pair of false or abdominal legs. In moving they first extend the body to its full length, then bring the posterior end close to the front legs, looping the body in the centre, then stretch out again and repeat the procedure, whereby they have gained the names '' span-worms," " loopers,'' or ''measuring-worms," and, indirectly, the scientific term Geometridse. There is never any difficulty in recognizing the caterpillars, and the moths are easily known in most instances by their slender bodies, small heads, and very broad wings, which are also, as a rule, frail and thin. The hind wings are here orna- mented much as are the fore-wings, so that the lines of the one pair are often continued across the other. When at rest, the in- sects keep the wings extended and flat, much as specimens are pinned in the cabinet. We have a large number of species, but comparatively few of them become troublesome. Perhaps the best known of all are the '' canker-worms,'' larvae of the species of Anisop- teryx and Paleacrita. 349- These attack a consider- able variety of trees, and are especially fond of apple and pear, which are sometimes completely defoliated. They are much more troublesome in the New England and Northern States, and I have often seen, in Mas- sachusetts, orchards com- pletely defoliated by them. In New Jersey and southward they rarely become trouble- some. Here, as in some of the Bo7nbycids^ the sexes are unlike, the males being winged, while the females are wingless. The caterpillars, when full-. FiG. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublishernp, bookyear1896
