These small to extremely small wasps are 0.4-6 mm long, and the body is yellow to brown with some dark markings, or sometimes metallic. The marginal vein on the forewing is usually long. The majority of eulophids are parasites of concealed larvae, usually Lepidoptera, but also Diptera and Coleoptera.

Eulophid cockroach eggcase parasite, Aprostocetus hagenowii (= Tetrastichus) This wasp is an egg parasite of several species of domiciliary cockroaches, including Periplaneta americana, P. brunnea, P. fuliginosa, P. australasiae, Blatta orientalis, and Eurycotisfloridana. Eggs are deposited into the ootheca after the female wasp explores the surface withher antennae and ovipositor. They oviposit into freshly deposited or old oothecae. In P. americana, developmentis completed in 23-56 days at2g °C, but the time depends on the number ofwasps in the ootheca. The larger the number of wasps, up to about 70 wasps per ootheca, the shorter the time required for development. All eggs are consumed when there is a large number of parasites, but when there are few, some cockroach nymphs complete development and hatch. Adult parasites emerge from the ootheca through 1-3 holes. In B. orientalis, an average of 66 offspring may develop from the eggs of one female wasp; in P. americana, there is an average of 103 offspring per female. The average number of parasites per ootheca in E. floridana is 648; in P. americana 204 parasites; and in P. australasiae it is about 50 parasites. Adults of this small parasite may be seen indoors when cockroach populations are large. It is probably cosmopolitan.

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