Piesmatidae is a small family of true bugs, commonly called ash-grey leaf bugs. The Piesmatidae are distributed mostly in the temperate Northern Hemisphere, with some occurring in Africa, Australia and South America. A common species found throughout the Americas is Piesma cinereum.

Ash-grey leaf bugs are small insects, some 2–4 mm overall. The head, thorax and the firm part of the wings are extensively dimpled. This resembles the similar pattern of the Tingidae of the infraorder Cimicomorpha, and was initially taken to signify a close relationship. It is due to convergent evolution however.

They feed on plant sap, mostly of Chenopodiaceae and Caryophyllaceae. Piesma linnavouri have been found on Acacia (Fabaceae). Mcateella have been found on many host plants but mostly Acacia and Proteaceae. The host plants of Miespa remain unknown.