Chironomid midges have been known to include parthenogenetic species for over a century. One of these species, Paratany tarsus grimmii (Schneider), cited under several different names here shown to be junior synonyms, has attained some notoriety as a pest. Its occurrence as a supposedly paedogenetic (actually pharate adult parthenogenetic) inhabitant of water distribution systems is discussed and related to its more usual occurrence in a variety of small water bodies including aquaria. New synonymy is proposed and a lectotype designated.

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Orthocladius (Orthocladius) is a subgenus of one of the more speciose genera amongst the Holarctic chironomids of the subfamily Orthocladiinae. Although many names have been applied, adult males are difficult to distinguish. However, the immature stages often are known, and pupae discriminate taxa reliably.

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