Ontario Sessional Papers, 1875-76, . ring into old pieces ofwood, and in the chambers thus formed they find secure lodgment; they will also boreinto corn cobs. When rearing them we have supplied pieces of cork for this purpose,and have had as many as twenty-one chrysalids enclosed within two small bungs about1|- inches in diameter, and one inch thick. The excavation is but little larger than thechrysalis which is to rest in it; it is not lined with silk, but is made moderately smooth,and is furnished with a cap or cover composed of minute fragments of cork, formed into asort of membrane
Ontario Sessional Papers, 1875-76, . ring into old pieces ofwood, and in the chambers thus formed they find secure lodgment; they will also boreinto corn cobs. When rearing them we have supplied pieces of cork for this purpose,and have had as many as twenty-one chrysalids enclosed within two small bungs about1|- inches in diameter, and one inch thick. The excavation is but little larger than thechrysalis which is to rest in it; it is not lined with silk, but is made moderately smooth,and is furnished with a cap or cover composed of minute fragments of cork, formed into asort of membrane by means of a glutinous secretion mixed with threads of silk. Whennicely finished, the surface of this cover is slightly glossy, the glossiness extending a littlebeyond the actual orifice, indicating that the glutinous matter has been of a thin consis-tence and has spread a little during its i^hen the lid is lifted the head ofthe chrysalis is usually found quite close to it. 362 39 Victoria. Sessional Papers (No. 1.) A. 1875. The chrysalis is about an inch long, of anearly uniform dark brown colour, and roughened with smallblackisli points or granulations. This insect is subject to the attacks of a parasite, a two-winged fly—a Tachina—probably the .species known as thered-tailed Tachina fly, Exoiista lencania (.see fig. 21, afterIviley). It is not much unlike the common fly in ap-pearance, is about a quarter of an inch long, with a white face,large reddish eyes, a dark hairy body with four, more or less,distinct lines down the thorax, and patches of a greyish shade along the sides of the abdo-men. The parent fly deposits her eggs on the back of the caterpillar, usually a short dis-tance behind the head, where they are cemented firmly by means of a peculiar secretionwith which the insect is furnished. Three or four of these eggs are usually placed upona single caterpillar, where, after a few days, they hatch, when the tiny worms eat thei
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