GEOMETRY. 



59 



Cidaria corylata Thunb. Askham Bog ( Tf-^/'.) ; Barnsley 

 {J.H.); Bishop's Wood {C.S.)\ Bradford {/.IV.C.) ; 

 Bramham ! (/^"w) ; Edlington Wood (C. 7:7^.) ; Hud- 

 dersfield {G.T.F.) ; Ingleton (CS.) ; Pontefract {B.H.) ; 

 Richmond (/. Sa?!g) ■ Sheffield [A.D.) ; Wakefield ( W. T.). 



Cidaria russata TV. V. Common everywhere and very 

 variable. 



Dark forms, including the variety perfuscata Haw., 

 are plentiful, much more so than in the southern counties. 

 In Butternab Wood, Huddersfield, I have more than once 

 taken a variety I do not remember to have seen elsewhere : it 

 is darker even than perfuscata and quite different in colour ; 

 the central band is black on a very dark reddish-brown 

 ground, and with no trace of the usual slaty grey. A figure 

 of the variety, as well as of the Yorkshire form of perfus- 

 cata, is given in Part xi. of Mosley's Illustrations of 

 Varieties of British Lepidoptera. 



Varieties centum-notata Fab. and comma-notata 

 Haw., I believe both occur, but I think not nearly so 

 commonly as the dark forms. 



Cidaria immanata Haw. Also apparently common through- 

 out the county, and like C. russata is very variable, but the 

 tendency of the variation is much paler generally than in 

 that species. Variety marmorata Haw. may perhaps be 

 taken as a central type of the variation. 



Cidaria suffumata W.V. Generally distributed and often 

 abundant. 



The dark rich brown form piceata Steph., sometimes 

 occurs ; and in the south West Riding a very beautiful 

 variety with black median band and basal blotch on a pure 

 white ground has been several times taken. The best I 

 have ever seen is in my own cabinet, and was taken at 

 Huddersfield in May 187 1. The specimen is figured in 

 the Entomologist of May, 1878, and also in Mosley's 

 Illustrations of Varieties of British Lepidoptera, Part xi. 



