The Willowherb Hawkmoth (Proserpinus proserpina) is a vagrant species of moth.
A small green hawkmoth which has only been recorded in Britain twice (one in May, one in July 2011). Only 18-21mm long, this species can be easily identified by it's size. Vagrant from mainland Europe, this species has white-tipped antennae. The abdomen narrows abruptly, and has two lobes at tip. It's forewing is light green with a darker green band running down it.