NOTODONTID^. 95 



distinct, and the marginal white spots are visible. In both 

 sexes the body beneath is very downy, white ; the legs black, 

 barred with white, and very strongly tufted with masses of 

 soft, downy, white scales. 



There is constant variation in the positions of the arrow- 

 head markings between the nervures ; in some specimens 

 these are crowded rather closely together, at a con- 

 siderable distance from the hind margin, and in these 

 instances there is a long black line from the marginal dot 

 running toward them ; in other cases the arrow-heads are 

 widely separated, the last being near to the hind margin, and 

 in these the black spot has but a short attached streak, or is 

 entirely without it ; every intermediate gradation occurs. In 

 rare instances the dark band between the first and second 

 line is intensified. Mr. S. Stevens has a specimen in which it 

 is broad and blue-black, all the following markings being 

 also intensified. One in Mr. S. J. Capper's collection has it 

 grey, but very near the base of the wings, and the spaces 

 before and beyond it pale yellowish ; and Mr. J. Harrison 

 has a female in which the fore and hind wings, thorax 

 and abdomen, are all clouded with smoky-black. 



On the wing in May and June. 



Lakva stout, smooth, head flattened in front and much 

 withdrawn into the second segment, which also is flattened in 

 front and remarkably squared ; fourth segment having a large 

 upright angular dorsal hump, extremely conspicuous when 

 the body is not stretched out ; body tapering thence to the 

 anal segment, which has no prologs, but is provided with two 

 long rough diverging points directed backward, each contain- 

 ing a long pink whiplike process or thread which is rapidly 

 exserted, like a long lash, when the creature is irritated. Head 

 pale brown, edged with black, but with the hind portion 

 pink ; general colour rich green ; second segment deeper green 

 edged with yellow, with a large black spot at each corner ; 

 from these corners, on each side, commences a white stripe 



