Under the recent classification of this family it now comprises three very well defined genera, which have moderately thick antennae, not elbowed, consisting of thirteen or fourteen joints; the nervures of the wings not so well defined as those of the Ichneumons; and the stalked abdomen attached to the upper part of the metathorax. They are well represented in this country, and have been chiefly described by Westwood and Schletterer. [Illustration: Plate XIII.--HYMENOPTERA. Family MEGALYRIDAE. 1. _Megalyra fasciipennis_ (Westwood). ♀. Family ICHNEUMONIDAE. 2. _Pimpla intricatoria_ (Fabr.). ♀. Family EVANIIDAE. 3. _Gasteruption sp._ Family MUTILLIDAE. 4. _Mutilla formicaria_ (Westwood). ♀. Family CHRYSIDIDAE. 5. _Stilbum splendidum_ (Fabr.). Family THYNNIDAE. 6. _Diamma bicolor_ (Westwood). 10. _Thynnus variabilis_ (Kirby). ♀. 11. _Thynnus variabilis_ (Kirby). ♂. Family SCOLIIDAE. 7. _Trielus zonata_ (Smith). ♀. 8. _Discolia verticalis_ (Fabr.). ♂. 9. _Discolia soror_ (Smith). ♀. Family SPHEGIDAE. 12. _Bembex tridentifera_ (Smith). (Original photo. Burton.)] [Illustration: _Plate XIII.--HYMENOPTERA._] The members of the typical Genus _Evania_ are generally shining black insects, sometimes variegated with dull red markings; the head and thorax are short and broad; the abdomen has the first segment produced into a slender stalk, and the remaining ones forming a vertically compressed hatchet-like body. They are parasitic upon the egg cases of cockroaches; some with a very wide range have been introduced in all probability with their cosmopolitan hosts, while they are often found in the house flying on the window panes, evidently introduced in the same manner. In the bush the perfect insects are commonly found on flowering shrubs in the summer time. About 20 species are described from Australia and Tasmania. _Evania princeps_ is of a uniform black colour with dusky wings, and is recorded from most parts of Australia, Woodlark Island and New Guinea. It is one of our largest species, measuring ½ an inch in length, broad in proportion, and furnished with very long spined legs.