. The bagworm. (Thyridopteryx ephemeraeformis Haw.). parasitized byseveral forms of ichneumon and chalcis flies, most of them specieswhich affect also similar tree-feeding caterpillars. Prominent amongthese is the common Pimpla inquisitor Say (fig. 6), which, however,more commonly parasitizes the tussock moth and tent related P. conquisitor Say is also a parasite of the bagworm anda third species of ichneumon, Allocota (Hemiteles) thyridopterigis Riley(fig. 7), is usually the most abundant of all. Four or five individualsof this species commonly infest a single bagworm, spinn
. The bagworm. (Thyridopteryx ephemeraeformis Haw.). parasitized byseveral forms of ichneumon and chalcis flies, most of them specieswhich affect also similar tree-feeding caterpillars. Prominent amongthese is the common Pimpla inquisitor Say (fig. 6), which, however,more commonly parasitizes the tussock moth and tent related P. conquisitor Say is also a parasite of the bagworm anda third species of ichneumon, Allocota (Hemiteles) thyridopterigis Riley(fig. 7), is usually the most abundant of all. Four or five individualsof this species commonly infest a single bagworm, spinning for them-selves white silken cocoons within the bag. [Cir. 971 a Malacosoma spp. The species last mentioned was for many years credited with beinga primary parasite of the bag-worm, although recent observationswould indicate that it is a secondary parasite when infesting other. Fig. 6.—Pimpla inquisitor: Female, fromside. Enlarged (from Howard). Fig . 1 .—Allocota (Hemiteles) thyridopterigis. Much enlarged(original). caterpillars. This might be explained by the hypothesis that thisparasite oviposits only in cocoons or cases of firm texture, and there-fore can not be the primary parasite of an insect which is not providedwith a case of that character.
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