352 LEPIDOPTÉROLOGIE COMPARÉE 



wliich may hâve a black suffusion both before and after it, as the 

 subterminal line. The same scheme holds on the hindwings, 

 except that the first and médian lines may be absent. White discal 

 spots edged with black may be found on the transverse veins m 

 ail four wings. To show the scheme of neuration, wings of 

 zonaria and rachelœ (PI. N) are selected as types, although the 

 neuration varies generically and, slightly, speciâcally. The shape 

 of the wings, too, differs with the species, slightly in some and 

 greatly in others. Both thorax, abdomen, face and femora are 

 strongly covered with fur which is much better developed, stouter 

 and more bristle like in the female. The antennae are large and 

 well pectinated. The gênerai description of the genitalia of 

 Pœcilopsis will serve for that of the group. Except in Lycia, the 

 females are practically wingless and, at most, possess rudimen- 

 tary wings incapable of fiight. The female of Pœcilopsis has 

 already been described. That of Lycia is well known and is not 

 hère discussed whilst those of Ithysia are black, yellow ringed in 

 zonaria, but black adorned with pale hairs in the others. The 

 wings in Ithysia female, are fairly broad for their size and are 

 heavily covered with white scales and bristles. The antennae are 

 simple in Pœcilopsis and lycia, but I hâve seen slightly pectinated 

 female antennae in italica and alpina and those of ail are strongly 

 covered with scales. 



We now come to facts concerning the hybrids themselves. The 

 preliminaries concerning them are given first and ail theoretical 

 considérations will be reserved until after the larvae, etc., are 

 considered. 



Cage used. 



As a resuit of my experiments with this group I hâve come 

 go the conclusion that a very large cage is just as fatal to success 

 as a very small one. In the first case, the insects fly too wildly 

 and seem to pay little attention to each other, whilst in the latter, 

 they dash about and destroy each other. AU the cages I hâve used, 



