374 LEPIDOPTÉROLOGIE COMPARÉE 



that form. The discal spots are more or less developed on ail 

 the wings. 



The undersides of the wings follow the upper sides but ail the 

 lines, etc., are weakened. 



The antennae are a little stronger than m sona/ia but the pecti- 

 nations approach nearer to the apex than those of hirtaria. 



The face is covered with brownish fur without the pale admix- 

 ture of zonatia. 



The thorax more resembles hirtaria in its roughly hairy, less fur 

 like, slightly crested appearance; the markings, however, follow 

 zonaria i. e. the blackish patagia are outlined in paler hairs as 

 in zonaria, and are not outlmed m black with a pale centre as 

 hirtaria. The coloration resembles neither, for the colours in 

 hirtaria are yellow and black, in zonaria, deep chocolaté and white 

 and in denhanii black and smoky grey. 



The abdomen, which is very like that of zonaria, is black, 

 adorned with paler hairs and a yellow ring at the base of each 

 segment, although the blackish ground, under the influence of 

 hirtaria, is of a warrner tint than in zonaria. 



The fur on the legs is greyer and less warm brown than in 

 hirtaria. 



Wing expanse : DenJiavn 28-44 mm. 



— — zonaria 27-29 mm. 



— — hirtaria 38-50 mm. 



Variation of imago. 



The hybrid is enormously variable, possibly owing to the fact, 

 that, as no females are produced, the variation proper to that 

 sex is passed on to the maies that replace them. This idea may 

 be confirmed by the fact that no hirtaria maies are as dark as 

 those of the hybrid, although many of the females are. The 

 variation observed is due to the extension of the blackish scales 

 in the ground colour. The wings may vary from being almost 



