. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. Order 12. DIPTERA. 615 behind, the space between them being very ample, and divided by a longitudinal impression in the middle. The posterior extremity of the metathorax is prolonged into a large scutellum over the abdomen. These insects live in the larva state between the scales of the abdomen of some Andrenae and Wasps, belonging to the subgenus Polistes. They move their prebalancers at the same time as their wings. Although a]iparently far remove
. The animal kingdom : arranged after its organization; forming a natural history of animals, and an introduction to comparative anatomy. Zoology. Order 12. DIPTERA. 615 behind, the space between them being very ample, and divided by a longitudinal impression in the middle. The posterior extremity of the metathorax is prolonged into a large scutellum over the abdomen. These insects live in the larva state between the scales of the abdomen of some Andrenae and Wasps, belonging to the subgenus Polistes. They move their prebalancers at the same time as their wings. Although a]iparently far removed, in many respects, from the ITymen- optera, I nevertheless consider thein nearest allied to some of these insects, such as the Eulophi. M. Peck has observed the larva; of Xenos Peckii, which is found in Wasps ; it is oval-oblong, without feet, annulated, with the anterior extremity dilated into a head, and the mouth formed of three tubercles. These larva; are transformed to pupa; in the same situation, and beneath their own skin, as it appears to me from an ex- amination of Xenos Rossii, and without changing its form. (See the memoir of M. Jurine upon this insect.) Probably the two prebalancers are ser- viceable in enabling the insect to disengage itself from between the scales of the abdomen of the in- sects in which they have lived. They are a kind of CEstri of insects. We shall subsequently see that a species of Conops under- goes its changes in the interior o&^he abdomen of Bombi. They compose [ four genera ] Xf-nos, Rossi; Sfylops, Kirby [and Elenchus and Halictophagus, Curtis]. They chiefly vary in the form of the antennae. The species of the first-named genus live in Wasps, and those of Stylops in Andrence. See on these insects the memoir of Kirby, in the eleventh volume of the Linncean Transactions ; [also the work of Curtis, and several memoirs which I have published in the Entomological Transactions^.. Fie. 130.—A, Stylops Dalii, nat. size; b, mannified ; c, A
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Keywords: ., bookauthorwe, bookcentury1800, bookdecade1860, booksubjectzoology
