Eupithecia irriguata (Hübner, )
70.1700 (B&F: 1818)
Resident species usually occurring singly or sparingly at mv light in mature oak woods in West Sussex., rare and in danger of extinction in East Sussex. Sparsely distributed in the western vice-county and extreme north-east, but extremely local and episodic in appearance. Probably under recorded because of its restrictive habits and early emergence. Single-brooded, flying mainly from late April to late May. Larvae feed on oak. (Pratt, 2011).