40 BOOK-EYED TJNDEBWING. 



fly in plenty on the top of the hill between Channouth and Lyme 

 Regis, Dorsetshire. It is not uncommon near Looe and Falmouth, 

 Cornwall, and is plentiful on Newmarket Heath, in Cambridgeshire, 

 and in various other parts of the county. It occurs sparingly near 

 Great Bedwyn and Sarum, Wiltshire, as J. W. Lukis, Esq. has 

 informed me; also in Hampshire, in chalk-pits, near Winchester, 

 according to J. Wesley, Esq. ,* and in Sussex near Brighton. 



The Rock-eyed Uuderwing is fond of barren spots, where heath 

 abounds, about stone-pits and rocky places. 



The perfect insect appears in the middle of July, and has been 

 known to continue till the 12th. of September. 



This butterfly measures from about two inches to two and a half in 

 the expanse of the wings. The fore wings are of a dull brown colour, 

 tinged with bronze, with a broad interrupted bar of various dark 

 patches near the princij^al vein. Towards the outer margin, are two 

 eyes. 



The female is smaller than the male, and the hind wings are brown 

 to the base, with a brighter-coloured wave near the margin, having a 

 single black eye, with a white centre near the inner lower corner. 

 Underneath, the fore wings are darker at the base, with the whole 

 outer part yellowish or pale buff", ended by a narrow dusky margin. 

 There are two eyes, the front one being the larger. The hind wings 

 are marked with numerous narrow white and brown streaks across. 

 The part next the base is the darkest, and is met by a very irregular 

 broad bar of a paler colour, which again becomes darker towards the 

 outside, and near the inner lower corner is a nearly obsolete eyelet, 

 the same indeed that appears also on the upper side. 



The caterpillar is green or gray, except on the lower part, which is 

 brownish. There are five longitudinal lines along it, one on the back 

 being darker than the rest. 



The figures are from specimens in my own collection. 



