LÉPIDOPTÉROLOGIE COMPARÉE 399 



give protection on a bare tvvig, whilst the variegated pomonaria 

 seeks to protect itself by mimicking the light and shade beneath 

 a leafy one. The hybrid larvas, like those of both parents, when 

 alarmed, only stick more tightly to the twigs and in many cases, 

 will allow their prolegs to be torn off rather than fall. In silk 

 spinning habits, when preparing for a moult, they are just like 

 the others but the cocoon spun by larva, is slightly stronger than 

 those of the zonaria hybrids. 



Pupas. 



I. Mâle. In size, the pupa is as near as possible the mean of 

 the two parent species and varies but little in this respect. 



In colour, the redbrown of pomonaria is slightly warmer than 

 that of hïrtaria, and the wing cases may be greenish tinged; 

 pilzii may follow in thèse characters, but, usually, it is more like 

 hirtaria in ground coloration and even in the light red of the 

 waxen-like wing cases. 



The shape, too, reminds one of hirtaria. The free abdominal 

 segments in hirtaria, looked at from above, are in the form of a 

 cône, with slightly convex, oblique sides. In pomonaria, the last 

 two segments are markedly larger in proportion, giving one the 

 idea of a smaller cône restmg on a larger truncated one. Pilzii 

 follows hirtaria, although the free segments are not so stout as 

 in that species. Viewed from the side in pomonaria, we hâve the 

 same lack of continuity in the rounded-outline of the last seg- 

 ments which in hirtaria and pilzii are regular. 



The surface of the pupee possesses but few, comparatively, of 

 the pits or minute dépressions which so plentifuUy besprinkle the 

 surface of hirtaria pupae, and this causes the pupa to be neafly 

 as glossy as that of pomonaria. 



The wing cases of ail are very much alike. The spiracles of 

 hirtaria seem more slit-like, and the dépressions are much less 

 emphasised than in pomonaria and this holds in pilzii, although 



