Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . are sleeping, and such are theeffects of its attacks, that, in some cases, death ensues.(Transactions of the Entomological Society, London, 1808,p. 135.) To the genus Loiir/iva, Osten Sacken refers, with consider-able cloubt, a fly, which I have found in abundance, raisingblister-like swellings on the twigs of the willow. They were fully grown in larva (Fig. 334,fly ; a, the larva ; 6,the pupa) is curved,cylindrical, taperingnearly alik
Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . are sleeping, and such are theeffects of its attacks, that, in some cases, death ensues.(Transactions of the Entomological Society, London, 1808,p. 135.) To the genus Loiir/iva, Osten Sacken refers, with consider-able cloubt, a fly, which I have found in abundance, raisingblister-like swellings on the twigs of the willow. They were fully grown in larva (Fig. 334,fly ; a, the larva ; 6,the pupa) is curved,cylindrical, taperingnearly alike towardseach extremity,F>?. :534. though the thoracic region is the thickest. The rings are thickened upon their pos-terior edges, so that they appear contracted in the middle. Itis glassy green, with two little elongated tubercles placed neareach other at a little distance from the end, where in the pupathey are terminal. It is .15 of an inch long when fully ex-tended. The pupa-case, found late in May, is oval, long, cy-lindrical and obtuse at both ends ; the anterior end is moreblunt; the first segment of the body is minute and forms the. lid, which opens when the fhr makes its exit, and boars twosmall slender tubercles which project upwards. The posteriorend bears two terminal spine-like tubercles similar to those onthe head, but projecting horizontally. The puparium is glassygreen, and the limbs of the enclosed pupa can be partially seenthrough the skin. The rings are (especially on the thorax)spinose, being the remnants of the rows of spines around thehind edge of the larval segments. It is .15 of an inch pupa lies a short distance from the opening of its burrow,which is about half an inch long, and is situated between thewood and the larva before pupa-ting eats away the bark,leaving a thin outerscale, or roundish blackspace which can befolded back like a the fly pushesopen when it swellings occuron the twig in the space Kl~
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectinsects
