6 CATALOGUE OF BUTTEEFLIES. 



COLIAS, Bdv. 



5. Colias Edusa (Fab.). Clouded Yellow. 



Colias Edusa. Staint. Man., vol. 1, p. 16. 



,, ,, Kewm. Brit. Butt., p. 143. 



,, ,, Barrett's Lep. Brit. Is., vol. 1, p. 35. 



Laeva. Buck., vol. 1, pi. i., fig. 3; Wils., pi. i., fig. 7. 



This beautiful Butterfly is generally recognised now as a 

 species which is an immigrant only ; which in favourable sea- 

 sons is able to survive the winter in small numbers, in suitable 

 localities in the south of England, but quickly dies out until 

 fresh immigration re-establishes the species for another season 

 or two. In our counties it is but an occasional straggler, though 

 much more frequent than the next, which does not appear to 

 have the migratory instinct of the genera Pieins and Colias. 

 In those years, when large hordes of Edusa have appeared in 

 Britain, a few specimens generally find their way into our dis- 

 trict. In 1887, when the species appeared in larger numbers 

 than were ever seen before in this country, it occurred in every 

 part of our district, even in the wilder parts, and in autumn the 

 second brood was comparatively common and had undoubtedly 

 fed up within our boundaries. It was not able, however, to 

 stand our winter and did not appear the following year, except 

 that a solitary specimen was taken at the foot of Hesleden Dene 

 by the late John Cambridge. The immigration of 1892 was not 

 nearly on so large a scale, and only a few specimens were taken 

 in these counties. It does not appear necessary to give localities 

 in the case of a Butterfly like this, which has no regular habitat, 

 and which is as likely to occur at one place as another. 



GONOPTERYX, Leach. 



6. Gonopteryx Rhamni (Linn.). Brimstone. 



Gonepteryx Rhamni. Staint. Man., vol. 1, p. 16. 



,, ,, Barrett's Lep. Brit. Is., vol. 1, p. 39. 



Rhodocera ,, JSTewm. Brit. Butt., p. 147. 



Laeva. Buck., vol. 1, pi. i., fig. 2; Wils., pL i., fig. 6. 



This Butterfly, which is very common in the south of England, 



