. Cuvier's animal kingdom : arranged according to its organization. Animals. 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 Andrensc and Wasps, belonging to the subgenus Polistes. They move their prebalancers at the same time as their wings. Although apparently far removed, in many respects, from the Hymen- optera, I nevertheless consider them nearest
. Cuvier's animal kingdom : arranged according to its organization. Animals. 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 Andrensc and Wasps, belonging to the subgenus Polistes. They move their prebalancers at the same time as their wings. Although apparently far removed, in many respects, from the Hymen- optera, I nevertheless consider them nearest allied to some of these insects, such as the Eulophi. M. Peck has observed the larvfc of Xenos Peckli, 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 larvse are transformed to pupee in the same situation, and beneath their o^ti skin, as it a])pears 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 Œstri of insects. We shall subsequently see that a species of Conops undei*- goes its changes in the interior of the abdomen of Bombi. They compose [ four genera ] Xenos, Rossi ; St y lops, Kirby [and Elenchus and Halictopkagus, 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 Andrenœ. See on these insects the memoir of Kirby, in the eleventh volume of the Linnœan Transactions ; [also the work of Cm-tis, and several memoirs which I have published in the Entomological Transactions^.. Fi(f. 130.—A, Stflops Dalii, nat. size ; b, magnified ; c, An- dreiia, uith the heads of two of its lurvEe exserted between the abdom
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