Pasiphila plinthina is a moth in the family Geometridae. It is endemic to New Zealand and is found in both the North, South and Stewart Islands. It is on the wing mainly from June until September with occasional observations up to December, and is attracted to light. This species is similar in appearance to P. sandycias but can be distinguished from it as P. plinthina has palpi that are longer and has more blurred forewing markings.

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