56 



THE YOUNG NATURALIST. 



An Armenian form, with ashy-grey wings, is called Armena, in 

 Staudinger 



Thyatira 



Derasa 



Batis 

 Cymatophora 



Duplaris 



I have some dark specimens of this insect, I believe, from Bannock. . 

 If the form is constant it would be as well named. 

 Fluctuosa 

 Diluta 



A very well marked variety of this species occurs in this county 

 (Durham), always much darker than any others I have seen, and 

 often has four distinct dark bands. A figure of this form is given 

 in Newman, who notes that the species is not given to variation. 



Ocularis 



Mavicornis 



Eidens 



Very variable, but no constant forms. 

 Bryophila 



Glandifera 



v. Par, Hubner. Paler and less distinctly marked. This is given 

 by South as a Species. There is as much difference between 

 northern and southern specimens of Perla as there is between 

 Glandifera and Par. It seems to me, to be what may be called a 

 Dealer's species. 



Algae 

 Perla 



DlPTHERA 



Orion 



v. Runica, Haw. Newman figures the two forms of this insect. 

 The same black marks are found in both, but they are a little more 

 distinct in one than the other. He thinks " it is very probable 

 there are two species combined under one name, and require sepa- 

 ration." No one else seems to think so, but some one who rears 

 the insect should settle the question. 

 Acronycta 

 Tridens 

 Psi 



The difficulty of separating these species is well known, but the com- 



