THE ENTOMOLOGICAL MAGAZINE. JULY, 1834. Art. XXI. — Essay on the Classification of Parasitic Hymenoptera, §c. By A. H. Haliday, M.A. {Continued from page 10G.) Of the Ichneumones of the Second Line, (Ichneumones adsciti, Essenbeck.) The species which have been referred to the genus Aphidius appear to compose a natural group, from the uniform way in which the characters, common to them all, correspond with the habits of those few whose history is known from actual observation. They are minute Ichneumones, each individual being nourished by a single puceron ; the empty skin of this is substituted for a cocoon, the larva being provided with no secretion of silk, like the others of this family. Accordingly, we find it solitary, devouring all the interior of its victim, and attaining a proportionate bulk. The spherical figure of that case adapts itself to the inflected attitude of the full grown larva, and of the pupa developed from it. a The same position finally is subservient, to the functions of the fly, which is thus enabled to bring the borer under the direction of her sight ; for, being equal or superior in size to the objects of her attack, a I presume that the pupae of the Chrysidae are similarly inflected. " J'ai vu le Cleptes nitidule allonger beaucoup son tuyau en passant aupres d'une larve de Tenthrede, et le pousser vivement contre elle. Quoiqu'il lui eut fallu pour cela recourber son abdomen et diriger ce tuyau entre ses pattes en avant de la tete, Poperation entiere fut l'affaire d'une seconde." — Le P. St. Fargeau. Some of the petiolate Pteromali {Miscogasteridip, Walker) also have the pupa bent double, though less completely ; but these do not inflect the abdomen in ovi-position. NO. III. VOL. II. g <;
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