DELTOIDES. 317 



line, or a series of black luuules ; cilia of the ground colour, 

 intersected and dusted with darker. Hind wings broad and 

 ample ; hind margin very sinuous ; colour pale smoky-brown ; 

 nervures faintly darker ; hind margin edged with a brown 

 line ; cilia white, much clouded with smoky-brown. Female 

 very similar, but with the body a little stouter. 



Underside of the fore wings smoky-brow a ; costa and hind 

 margin clouded with golden-brown ; cilia dappled with the 

 same. Hind wings brownish-white, the front half dusted 

 with brown and black, and showing a short portion of a 

 transverse smoky-black stripe ; extreme hind margin edged 

 with black lunules ; cilia smoky-white. Body pale brown, 

 dusted with black ; legs long, pale brown ; darker brown in 

 front. 



Variable in the ground colour from whitish-brown to dull 

 smoky-umbreous, much more so in the markings. Very often 

 the fore wings appear to be sharply divided transversely at 

 the second line — all outside it being far paler than the inner 

 area ; when this is the case the outer area is often very 

 prettily waved with parallel lines of cloudy pale brown ; in 

 other instances it is very uniform in colour, and sometimes 

 even the black apical streak is obscured or absent. The 

 same occurs to the black streak between the stigmata, and 

 even to a portion of the raised black dots ; but on the 

 other hand, when there is no dividing line, and the whole 

 area of the wing is umbreous, these dots stand most con- 

 spicuously upright, and render the species unmistakable. 

 This happens also when the colouring is changed to longi- 

 tudinal stripes of brown clouding, and all other markings 

 have disappeared. All intermediate forms are found, and it 

 is difficult in words to do justice to the mutations of this 

 interesting insect. 



On the wing in August and September, and after hyber- 

 nation from April till June. 



Larva about an inch long, and slender in proportion ; 



