430 LEPIDOPTEROLOGIE COMPARÉE 



of zonaria. If anything, they are even rougher in the surface. In 

 no vvay do they approach the soft glossy ova of ponwnaria. 



(B) Ithysia zonaria cf x Pœcilopsis pomonarïa q = hybrid. langei. 

 Ithysïa hybrid langei (Harrison, Eut., July igio). 



This also is an easy crossing to obtain although not quite so 

 certain as that which produces hybrid helenœ for in certain of 

 my experiments pairing was delayed for several days. Just as 

 in the case of pilzii, it has been noticed that the female pomonaria 

 are shy in laying their eggs, although, like those which produce 

 that hybrid, the ova are, for the most part, fertile. The food plants 

 of the larva are exactly what are used with helencp and are eaten 

 with the same avidity. 



ist INSTAR. — 4,1 mm. 



The larva at the end of this instar is but little différent from 

 that of helenœ, although it is a little smaller. A few différences, 

 of but little importance, can be made out. The fi.rst obvious one 

 is that the tone of the yellow markings is of a lighter character, 

 and the yellow spots, appearing at various points, are large and 

 almost as conspicuous as they are in zonaria. The longitudinal 

 stripes are also of a more definite description and appear some- 

 what earlier than they do in helenœ. 



Perhaps the collar, too, is slightly nearer to zonaria in being 

 rather less distinct. 



2nd INSTAR. 



Length at the end : 7,5 mm. 



Head. — Although this larva very closely approaches that of 

 zonaria, it is remarkable that, in this instar, ail my examples, 

 con-tinued to hâve a black head to the end, and showed no ten- 

 dency to pale spotting such as ^^/^;Z(^ displayed. That is to say, 



