LÉPIDOPTÉROLOGIE COMPARÉE 4OI 



The pupas of both sexes tend to lie over for more than one 

 winter to a greater extent than do thosc of denhami and harrisoni, 

 but this tendency is much less when English hirtaria are the 

 parents than when imagines of Scotch or German origin are used. 



Dehiscence of pupae. 



In both sexes, the pupal shell breaks and the imago émerges 

 just as in the case of harrïsoni. 



Imago. 



The imago forms, as usual, in the year previous to emerging. 



I. Male. The ground colour of the insect cornes very near to 

 hirtaria, but it is much more suffused with black scales, a character 

 vvhich most certainly is not derived from pomonaria, which is 

 ochreous white in colour. The scaling, although thin, is very diffé- 

 rent from the weak and semi-transparent scaling of pomonaria. 

 In fact, so strong is it comparatively, that at hrst sight the insect 

 would be taken for a small curiously marked hirtaria. The basai 

 portion of the wing and the inner margin are pale and more fully 

 scaled in pomonaria, and this character is transferred to pilzii. 



The first line combines the tendency of that of hirtaria to be 

 close to the base, with the conspicuous bulge of pomonaria as it 

 crosses the cell. As in hirtaria, it shows weal< traces of being 

 doubled. Like the rest of the lines, it is more prominent in the 

 paler area before the first vein. The médian line is présent, but 

 seems very indistinct, becoming thicker like that of pomonaria, 

 as it intersects the transverse vein and continuing thick, as in 

 hirtaria, until it reaches the costa. There is no definite bend in- 

 ward as in hirtaria however. The resuit is that, starting as it does 

 near the second line, the space between them is very narrow. For 

 the greater part of its length, the médian line appears more or less 

 fused with the second line, although both are quite distinct in the 

 costal area. The second line follows the course taken in hirtaria, 



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