. The Cambridge natural history. Zoology. PARASITICA 539 Fam. III. Chalcididae. Pronotum luith some freedom of movement, its angles not extend- ing to the insertion of the front wings. Antennae elbowed, consisting of from seven to thirteen joints. Wings ivithout a system of cells; with a single definite nervure jiroceeding from the base near the front margin, or costa; afterwards passing to the costa, and giving off a very short vein more or less thickened at its termination. The species are, ivith feiv exceptions, of parasitic habits. The Insects of this familyâthe Pteromalini of Eatzebnrgâ a
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. The Cambridge natural history. Zoology. PARASITICA 539 Fam. III. Chalcididae. Pronotum luith some freedom of movement, its angles not extend- ing to the insertion of the front wings. Antennae elbowed, consisting of from seven to thirteen joints. Wings ivithout a system of cells; with a single definite nervure jiroceeding from the base near the front margin, or costa; afterwards passing to the costa, and giving off a very short vein more or less thickened at its termination. The species are, ivith feiv exceptions, of parasitic habits. The Insects of this familyâthe Pteromalini of Eatzebnrgâ are frequently of brilliant colours and of remarkable form; the species are very numerous, some 4000 or more having already been described. Of this number nearly 3000 are European, and as there is good reason for supposing that Chalcididae are quite as numerous in the Tropics and in the ISTew World as they are in Europe, the family will probably prove to be one of the largest in the class. About twenty sub-families have already been proposed for the classification of the group; they are based chiefly on the number of joints in the tarsi, and the details of the antennae and of the ovi- positor. This latter exhibits great variety in external ap- pearance, due chiefly to the modification in form of the basal, or of the following ven- tral abdominal plates, one or more of which may be pro- longed and altered in form or direction, giving rise in this way to considerable diversity in the shape of the abdomen. -â â, , ^ , , - â , ^ . Fig. 355. â Eurytoma abrotani, male. Correlative with this is a Britain. Hyper-parasite througluVicro- D-reai- varietv in the mode gaster oi Liparis dispar, laiA s.acovimg great variety m me moue ^^ Cameron, parasite of lihodites rosae of parasitism of the larva. and other gall-flies in Britain. x 10. Many live in galls, feeding on ^^^''' Katzeburg.) the larvae of the makers of the galls or on those of the inquilines; others attack caterpillars, other