﻿THE BUTTERFLIES OF THE BUCKS. CHILTERNS. 79 



PlERID^. 



18. Pieris hrassicce, L. Common on the warm hillsides, and 

 in the second emergence sometimes occurs in vast numbers, as 

 in August, 1909. There is, no doubt, a partial third brood in 

 favourable seasons, as in 1897. 



Earliest seen, gen. veni., April 13th, 1914; gen. ast., July 

 8th, 1899; geii. auctumn., October 30th, 1897, somewhere in 

 the neighbourhood of Great Missenden. 



19. P. rapes, L. Common. 



Earliest date observed, gen. vern., April 8th, 1908 ; gen. ast., 

 aiit auctumn., latest seen, October 9th, 1913. 



20. P. napi, L. Commoner, as a rule, than either of the 

 preceding; at the outskirts of the woods, and in lanes. 



Earliest date observed, gen. vern., May 1st, 1900; gen. cest., 

 ab. napfece, Esp., August 3rd, 1899. 



[Pontia daplidice, L. I know of no Chiltern specimen in 

 collections. Every year, both at the time when the spring 

 migration takes place, and in September, I have visited a certain 

 locality where the wild mignonette {Reseda lutca) grows in abun- 

 ance, and spreads with the lean pastures which at other times 

 have been arable. So far I have not been rewarded.] 



21. Euchloe cardamines, L. In most seasons abundant, 

 especially in May, 1911. Males often on the open down; the 

 females preferring the hedge-banks where Sisymbrium alliaria 

 grows. 



Earliest date observed, April 20th, 1912 ; latest, June 26th, 

 1897, when it was still quite fresh. 



[Leptosia sinapis, L. Another butterfly which should be 

 found in woods on the southern incline. Locally abundant in 

 certain woods on the Northamptonshire border, in one of which 

 I found it on June 4tb, 1908.] 



22. Colias hyale, L. I have not yet met with this species on 

 the Bucks. Chilteros, but Professor Cartier reports capture in 

 1900 in the neighbourhood of High Wycombe, and Mr. Spiller 

 in the Buckinghamshire clover fields towards Bledlow Eidge, 

 also on the west. 



[Taken September 13th, 1900, by the Rev. F. A. Walker 

 ('Entomologist,' xxxiii. p. 273) near Chorley Wood, and near 

 Chalfont Eoad, August 21st, 1901, by Mr. G. B. Oliver {loc. cit., 

 xxxiv. p. 291) ; both localities rather outside my southern 

 limit.] 



23. C. edusa, Fabr. I had never seen this butterfly in any 

 profusion before 1913, even in edusa years. In August, Se[item- 

 ber, and October of that season it was to be seen in all localities 

 visited by me, the males outnumbering the females by three to 

 one at least. It flew on the hillsides and adjacent clover and 

 lucerne fields from Princes Risborough to Aston Clinton, and 

 westward to the Wycombes. 



