432 LÉPIDOPTÉROLOGIE COMPARÉE 



coloured, the colouring being clearly of the zonaria type, instead 

 of, as in helenœ, approachiiig the yellow of pomonaria. In langei, 

 too, the spiracular stripe is decidedly broader and more regular, 

 although the spiracles are not contained in it. Langei also repro- 

 duces the black supraspiracular suffusion of zonaria more closely. 

 Ventrally, langei is just as clearly like zonaria, as helenœ is like 

 pomonaria. 



4th INSTAR. 



Length at end : 2,2 cm. 



Head. The head is more strongly marked with black than 

 that of helenœ larva. but otherwise, is just the same. 



Body. The body is just a little stouter. In colour, it appears 

 a little lighter due, not so much to a real lightness in colour, as 

 to a freedom from the darker dots in the ground and to 

 the limited but more deûnite nature of the suffusions. In ail 

 probabil ity this impression of a light ground colour is confirmed 

 by the greater dot like appearance of the edging and the fineness 

 of the stripes, which allow a greater area for the ground colour. 

 The supraspiracular stripe is very much less continuous in laîîgei. 

 Further the anal plate is scarcely so rounded posteriorly and is 

 rather darker. 



Beneath, whilst the stripes are a little nearer to pomonaria, 

 the whole effect of the coloration is to remind one vividly of 

 zonaria — an idea that is strengthened by the dark suffusion 

 under the broad zonaria like spiracular stripe. Both above 

 and below, the larva appears slightly more delicately built than 

 helenœ and the yellow marks are always paler. 



5th INSTAR. 



Length at end 3,8 cm. 



Breadth of head 2,9 mm. 



Greatest breadth 4, i mm. 



The larva, in the last instar, whilst appearing more like zonaria 

 to a casual glance on account of the very deûnite appearance 



