Q UA DRIF1D.-E. 265 



a round, partially yellow spot; the portion near the costa, of 

 the stripe between the two bands, is also yellow. Body and 

 legs brownish-white ; tibia3 barred black and white. 



Hardly variable except in the depth and extent of dark 

 shading upon the fore wings and in the presence or absence 

 of light brown dusting or shading in the hinder area. 



On the wing in July and August. 



Larva elongated, thickest at the ninth and tenth segments, 

 tapering thence a little gradually to the head, and a little more 

 to the anal extremity ; on the back of the ninth segment is a 

 prominent ridge having a triangular hump ; and there is a 

 slight elevation near the end of the twelfth, bearing the hinder 

 pair of tubercles, more sharply prominent than the rest; 

 back rounded ; undersurface flattened ; at the junction of the 

 two, just above the legs, is a fringe of fleshy filaments, simple 

 and branched ; the anterior pairs of raised dots on the back 

 are small, while the hinder pairs and the single row along 

 each side are rather large and bluntly pyramidal, every one 

 having a fine bristle ; the head rises a little on the crown, 

 where the lobes are slightly defined, and is rather flat in 

 front, light green or greenish-grey, reticulated with darker 

 grey ; a transverse streak of black reticulation over the crown 

 extends to the mouth, defining the face, which is whitish 

 with a dark grey streak on either side downwards to the 

 mouth, behind is a short black streak at the back of the 

 cheeks ; ground colour of the body light greenish-grey ; the 

 thoracic segments much covered with freckles of light and 

 dark grey and black, some of them so disposed as to faintly 

 indicate double dorsal and subdorsal lines ; on the fifth seg- 

 ment is a large distinct pale patch of faint ochreous-green 

 on the sides and back, the hinder area being darker ; another 

 pale patch on the ninth, and on the tenth less pale, strongly 

 contrasted toward the division by a sooty transverse irregular 

 band extending down either side from the blackish hump on 

 the ninth segment to the back of the leg, whence it spreads 



