100 LEPIDOPTERA. 



of the uortli of Scotland a further change is found, the white 

 ground colour being obliterated, and the head, thorax, and fore 

 wings becoming of a uniform dark bronzy-yellow or bronzy- 

 brown, presenting the exact form known in Alpine districts 

 abroad under the varietal name of ro-stcl/ii>i. These well-marked 

 forms are attended by supplementary variations, — on the coast 

 of Lancashire is one of small size, a most beautifully peai'ly 

 appearance and almost greenish lustre, without any trace of 

 markings ; another, occurring in the north of Ireland, is uni- 

 coloi'ous bronzy-///'(7/, while associated with it are ordinary 

 large, pearly, typical specimens — indeed, it becomes neces- 

 sary to see the mixed and intermediate forms from northern, 

 eastern and western localities to obtain anything like a full 

 appreciation of the capacity of this species for variation. 

 On the wing from the end of June till August. 



Lak\a three-quarters of an inch long, stout, cylindrical, 

 skin semitransparent ; segments well defined, each having a 

 subdividing transverse wrinkle in the middle; head polished, 

 pale yellowish-brown slightly freckled with dark brown, or 

 in occasional specimens darker brown ; in all cases the man- 

 dibles are dark sienna-brown ; dorsal plate polished, rather 

 browner than the ground colour ; the latter is greyish-stone 

 colour, some specimens having a brownish tinge ; the greenish 

 alimentary canal shows through as a dorsal stripe ; raised dots 

 shining, of a darker shade of the ground colour, each con- 

 tains a black spot from which springs a single short hair ; 

 spiracles intensely black ; ventral surface of a paler shade 

 than the dorsal area ; legs ringed and tipped, and prolegs 

 slightly fringed, with dark sienna-brown. (G. T. Porritt.) 



August or September till May or June, on grasses — Aira, 

 Fcstuca, and others — apparently all grasses, but showing a 

 preference for the harder, coarser species ; living in silken 

 galleries at the bottom of the grass stems ; when near full 

 growth inhabiting a tubular gallery two inches long, firmly 

 attached to the grass in an upright position, the lower end 



