Transactions of the American Entomological Society, 17. köide

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Society at the Academy of Natural Sciences, 1890

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Page xv - Station. ^Bulletin from the Laboratories of Natural History of the State University of Iowa Vol.
Page 322 - History," is given as representing more clearly and definitely than any other, an account of the present state of our knowledge of the structure of the Dipterous mouth.
Page 139 - The larva has three pair of thoracic or true jointed feet, and four abdominal or false feet, besides anal claspers. This larva, eating on the inner side of the bark, and making furrows in the wood, causes the bleeding which, when the depletion is excessive or continuous, and especially in the case of young trees, has proved fatal. In July the worm spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both the larva and the chrysalis.
Page 186 - Pulvinaria these tubes extend from one bark-louse to another. The caterpillars are very active, moving freely about within these silken passages from beneath one scale to another. At the time my observations were made (June 24th) many of the caterpillars were full grown, and some of them transformed at once. The cocoon is made within the silken tunnel and is quite delicate, the pupa being plainly visible within it. Individuals of this brood remained ten days in the pupa state. The greater number...
Page 187 - ... 13th. These moths are not easily disturbed ; but will suffer the twig, upon which they are, to be handled freely without moving ; and often they will not take to flight even when touched. They usually rest upon the two posterior pairs of legs and the tip of the folded wings, with the front pair of legs drawn closely to the body, and the whole body forming an angle of about 45° with the object upon which they are at rest. In this position they will remain motionless for hours. Can it be that...
Page 125 - May 21, burrowing in the branches of the pignut hickory, Carya porcina, usually selecting the lower branches; imagoes about June 22. Chrysalis. Of the usual form, pale brown, rounded at the posterior end, at which place there is a cluster of about four slender hooked spines; length, from 7 to 8 mm. The larva spins a thin web around the footstalks of the leaves which grow near the terminal end of the branch, and then burrows into the terminal bud and the wood of the present year's growth. It webs...
Page 186 - Pyralid larvae were predaceous. One of these larvae was placed in a glass tube with a bark-louse, the eggs of which had not been destroyed. These eggs had just hatched and the cottony excretion was swarming with the young lice. The larva soon made its way under this mass, and after spinning a delicate silken tube about its body began to devour the young lice greedily.
Page 184 - Near the base of the wings there is a short transverse gray band which is sometimes obsolete ; exterior to this is a short longitudinal black spot, which also varies greatly in size and intensity of color. The light band which extends across the outer part of the basal third of the wing is bordered externally by a dark band, which is narrow on the costal and near the middle of the wing widens so as to reach the outer third of the wing. There are two black discal spots which are sometimes distinct...
Page 130 - ... part of first or basal line, this basal branch being also usually darker than the outer or posterior branch. The triangular costal patch from the basal line is obsolete. The transverse pale lines are less clearly defined and the terminal is nearer the posterior border of the wing, i.
Page 183 - Head horizontal, freckled, pale behind, tinged with greeu in front and with a few long hairs. Joint 1 also freckled and with a large black piliferous tubercle with a pale basal annulation and in range with middle of dark stripe. Joint 2 with similar black tubercles with a white center and replacing the uppermost lateral pale spot. There are but two of the small pale dorsal piliferous spots on this joint, (between the tubercles), as well as on joint 8.

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