Erechthias acrodina is a species of moth of the family Tineidae. This species was first described by Edward Meyrick. It is endemic to New Zealand and is found in the North, South and the Chatham Islands. This species inhabits native forest often near Phormium species and have also been observed on dead Leptospermum scrub. Larvae has been reared from decaying Phormium leaves. Adults are on the wing from October to February.
It was described by Edward Meyrick in 1912 using a specimen collected by George Vernon Hudson in Wellington and named Ereunetis acrodina. In 1914 Meyrick assigned this species to the genus Erechthias. Alfred Philpott discussed this species under the name Erechthias acrodina in 1917. In 1927 Philpott studied and illustrated the male genitalia of this species. George Hudson discussed and illustrated this species in his 1928 book The butterflies and moths of New Zealand under that same name. In 1988 John S. Dugdale confirmed the placement of this species in the genus Erechthias. The female holotype is held at the Natural History Museum, London.
Meyrick described this species as follows: Superficially this insect very closely resembles Erechthias fulguritella, but may be distinguished from that species by the oval pale brown patch near the costa, and the absence of any well-defined projections from the dorsal edge of the central streak.
This species is endemic to New Zealand. As well as the type locality of Wellington, this species has also been observed in Christchurch, Dunedin, the Takitimu Mountains, and at Lakes Te Anau and Manapouri and Bluff. This species has also been observed in Auckland and on the Chatham Islands.
This species inhabits native forest. In Auckland this species has been found in rocky places near Phormium on the coast. Larvae has been reared from decaying Phormium leaves.
Adult of this species are on the wing in October to February. Adults have been observed on dead Leptospermum scrub.