Abstract
Study of various morphological features, especially those of the female genitalia, and consideration of the chromosome complements, leads to the conclusions that a lygaeoid ancestral stock has given rise to 2 superfamilies, the Coreoidea ( Coreidae, Alydidae, Rhopalidae, and Stenocephalidae) and the Pyrrhocoroidea (Largidae and Pyrrhocoridae) ; and that the Stenocephalidae and the Largidae are least advanced in their respective superfamilies. In Part II, the conclusions reached are that, within the Coreoidea, the Coreidae, Alydidae, and Rhopalidae merit family status; and that, of these, the Rhopalidae are the most generalized, the Coreidae the most advanced, and the Alydidae intermediate in some respects but highly specialized in others.

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