390 LEPIDOPTERA. 



On the wing in July and August, and in its northern and 

 western range, in September. 



Larva stout, each segment thickened and rather wrinkled 

 at the sides ; head small, shining black-brown, rather lighter 

 brown at the sides ; general colour dusky olive-greeu, mottled 

 all over with small black streaks and dapplings ; each seg- 

 ment of the body having a faintly indicated pale olive-green 

 spot on each subdorsal region, below which, on each side, is 

 an oblique shading of blackish-green ; legs pale brown tipped 

 with darker ; prolegs and under surface pale olive-green. 

 (From larvEG sent for description by Mr. C. S. Gregson.) 

 Mr. Logan's description (184G) from larvee found near Edin- 

 burgh indicates some variation : " The general colour greenish 

 or greyish-black, suffused in some individuals with a faint 

 purplish bloom ; along the back are two rows of whitish or 

 yellowish spots, each spot bounded anteriorly by a darker 

 shade of black. These spots become indistinct toward the 

 head, and disappear entirely on the third segment ; they are 

 much more fully developed in some individuals than in others ; 

 the general colour is also variable." One of Mr. Buckler's 

 figures is of a dark purple-grey, and has behind each pale 

 subdorsal spot a black wedge-shaped streak ; the other is more 

 as is above described. 



August to May on Cam.panula rotund-ifolia, Sechim acre, 

 saxifrage, cowslip, chickweed, and various grasses, especially 

 Festuca ovina. Usually found in stony or rocky places, and 

 fond of reposing at night, and sometimes in the sunshine, on 

 the rocks, especially where these are grey with lichen and 

 afford protection from similarity of colour. Mr. F. C. Wood- 

 forde tells me that, of a considerable number found by himself 

 and Mr. E. W. H. Blagg, not one was upon the plants, all 

 were on the smooth faces of perpendicular rocks, at night, 

 exactly as though feeding on the microscopic lichens. They, 

 however, showed no disposition to devour lichen when in 

 confinement, and this exposure seems to be in some degree 

 preparatory to spinning up. 



