Pachygonidia hopfferi is a moth of the Sphingidae family. It is known from Panama and Costa Rica and has been recorded as far south as Bolivia. The wingspan is about 74 mm. There is a grey-brown submarginal patch on the forewing upperside and the outer edge of the dark postmedian band is smooth. There are three median transverse rose-pinkish bands on the hindwing upperside. There are probably multiple generations per year. The larvae probably feed on Doliocarpus dentatus, Doliocarpus multiflorus and Tetracera hydrophila.