70.267 Hypomecis roboraria (Great Oak Beauty) 1943
fw: 21-32mm; Jun-Jul; pedunculate oak (Quercus robur); NS-B in large mature oak woodlands in SC.England especially Hampshire, Sussex, Surrey & Berkshire
ID: Distinguished from similar species by size; convergence of 2nd & 3rd cross-lines to form a dark blotch at the dorsum; small dark central spot on hindwing. Most similar to H.punctinalis (Pale Oak Beauty) in which 2nd and 3rd cross-lines converge to a lesser extent and do not form a dorsal blotch and the hindwing spot has a pale centre.
Page published 06/03/2014 (§1-3)