ROCK-EYED UNUERWING. 43 



Arthur's Seat, near Edinburgli; the Cheddar Cliffs, Somerset- 

 shire; "Wahiier Forest and Languard Forest. I have also 

 taken this Fly in plenty on the top of the hill between 

 Charmouth and Lyme Regis, Dorsetshire. It is not uncommon 

 near Falmouth, CornAvall, and is plentiful on Newmarket 

 Heath, in Cambridgeshire, and in various other parts of the 

 country. It occurs sparingly near Great Bcdwyn and Sarum, 

 Wiltshire, as J. W. Lukis, Esq. has informed me. 



The Rock-eyed Underwing 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 exijansc of the Avings. The fore Avings are of a 

 dull brown colour, tinged with bronze, with a broad interrupted 

 bar of various dark patches near the principal 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 Avhite and brown streaks across. The 

 part next the base is the darkest, and is met by a very irreg- 

 ular 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 apj)ears also on 

 the ujipcr side. 



The caterpillar is green or grey, except on the loAvcr 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. 



