July, isr^i.i 25 



OX THE BRITISH TORTRICES OF THE GEXERA BICRORAMFHA 

 AXD ENDOPISA, AS RESTRICTED BY WILKINSON. 



BY CITAS. G. BARRETT. 



Although widely separated in Wilkinson's work on the British 

 Tortrices, some of the species in these two genera are so intimately 

 allied in general appearance, that it is useless to attempt to clear up 

 the difHculty which envelopes them, without taking both together. 

 It is hardly necessary to add, that in Mr. Doubleday's list, and in that 

 of Dr. Wocke, in Staudinger's Catalogue, these species are arranged 

 quite differently. 



Dicro-rampha Petlverella, L. — Sufficiently described by Wilkinson. 

 A well known and abundant species. 



D.Jlavidorsana, Ivnaggs. — Described by Dr. Knaggs, E. M. M., 

 January, 1867, and in the Ent. Annual for 1867, where it is also 

 figured. Of this species Professor Zeller writes that — " it is a variety 

 " of Petlverella, and flies with it." With great reluctance, I am com- 

 pelled to agree with him. A careful examination shows no distinctive 

 marking which is not partaken of by Petiverella, nor any line which 

 can be satisfactorily drawn between their variations ; neither does it 

 show any peculiar habits nor special habitats. The place in which I 

 took the original specimens produced no more, and the other captures 

 seem to be equally casual. 



D. seqiiann, Hlib. — A very distinct species, sufficiently well de- 

 scribed. 



D. poUtana, Hiib. — This species is sunk into a synonym of alpi- 

 nana, Tr., by Dr. Wocke, in Stand. Cat., — not even recorded as a 

 variety. Prof. Zeller suggests that both may be only forms of Peti- 

 verella ; he says — •" they all fly together, and are united by insensible 

 " passages." In this count-y this is not the case, Petiverella occurs 

 everywhere, and therefore accompanies the other species in their lo- 

 calities ; hut politana is local, and not to be found in many parts of 

 the country, but swarms wherever it occurs : moreover, its characters 

 are sufficiently distinctive — fore-wings long and narrow, dorsal blotch 

 very oblique, much more so than in Petiverella, its anterior margin 

 straight, consequently appearing to be produced along the dorsal mar- 

 gin of the wing. Costal streaks numerous and very short. 



D. alpinana, Tr. — Pore-wings much broader than in politana, dull 

 olive-brown, costal streaks few and indistinct, dorsal blotch broad, only 

 slightly ob!i(|ue, with curved anterior margin. 



