. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. FiG. 62.—Meteorus versicolor: Immature larva from hibernating caterpillar of the brown-tail moth. Much enlarged. (Original.) istic of its hibernating condition. These larvre are curiously anoma- lous, in that though they are actually first-stage, the head alone is considerably larger than the original egg as deposited by the mother. An interesting series of dissections made by Mr. Timberlake in the spring of 1910 served to ex- plain this apparent anomaly. The eggs are very small when first deposited and almost gl
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. FiG. 62.—Meteorus versicolor: Immature larva from hibernating caterpillar of the brown-tail moth. Much enlarged. (Original.) istic of its hibernating condition. These larvre are curiously anoma- lous, in that though they are actually first-stage, the head alone is considerably larger than the original egg as deposited by the mother. An interesting series of dissections made by Mr. Timberlake in the spring of 1910 served to ex- plain this apparent anomaly. The eggs are very small when first deposited and almost globular. Apparently with the beginning of embryological development they begin to grow and by the time the inclosed embryo begins to assume the charac- teristics of the larva they have reached a diame- ter at least four times greater than that of the newly deposited egg. The enormous chitinized head, with strong, curved mandibles, is in strange contrast to the undifferentiated cephalic segment of Apanteles and is apparently closely analogous to the large-headed, heavily mandibled larvae of the Platygasters, as described by Ganin, Marchal, and others. There are many points of resemblance between the two forms, and it would seem, without going into the matter at all deeply, as though the type of embryological and early larval development characteristic of Meteorus were essentially the same as that of the Platygasters and many ichneumonid genera, while that of Apanteles would have to be considered as of an essentially different t}Tpe. In both Apanteles and Meteorus the later larval stages are much more conventionalized and more like the familiar type. The position assumed by the Apanteles larva is not very definitely known. The Meteorus larva usually lies superior to the alimentary. Fig. QZ.—Zygobothria ni- dicola: First-stage larvae in situ in walls of crop of hibernating brown-tail moth caterpillar. Great- ly enlarged. (Original.). Please note that these images are extracted
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology
