Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomolo00smit Year: 1906 THE INSEC7 WORLD. 307 become so, there would be no trouble in protecting the j:)lants by means of the arsenites. Now we reach the family Geometridce, 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 re
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomolo00smit Year: 1906 THE INSEC7 WORLD. 307 become so, there would be no trouble in protecting the j:)lants by means of the arsenites. Now we reach the family Geometridce, 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 Geometridae. 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 I'ule, 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 Pakacrita. These attack a consider- able variety of trees, and are especially fond ot 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 southward they become trouble- Here, as in some Fig. 349. Fig. 349, Paleaci ita veiiiala.—a, male ; b, fe- male; c, d, structural details. Fig. , Anisop- teryx pometaria.—a, male; b, female; c, d, e, structural details. and rarely some. of the Bombycids, the sexes are unlike, t
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