( -^lii ) 



obvious and strongly characterized members of the " Planema 

 poggei group " : a more outlying, but apparently distinct 

 member was found in the female of Precis raucma, Grose- 

 Smith. 



Dr. T. A. CHAPjrAX exhibited butterflies taken last summer 

 near Biarritz, and in Spain, in the Logroiio Sierra. 



These he suggested were probably examples of homoeochro- 

 matism. Little, attention has been directed to homoeochro- 

 matism in European butterflies, and these were certainly not 

 examples of the detailed mimetism we are now familiar with 

 in Miillerian groups from the African and neotropical regions. 

 The first of these sets of associated species has, however, 

 some of the aspects of a Miillerian group. It contains three 

 species, which are all on the wing together in very restricted 

 habitats, into Avhich the numerous other butterflies flying 

 at the same time in the immediate vicinity do not intrude. 

 They have the same general appearance and coloration when 

 flying; a peculiarity which none of the outside species happen 

 to possess. 



They are dark, almost black on the upper-side, a colour 

 rather unusual amongst European butterflies, and besides 

 these three, only found, I think, in Aphantopus hyperantus, 

 and in Satyrus actxa and >S'. cordula ; in the two latter 

 without the dingy brownish tone of the species exhibited. 



The locality is at Guethary, a most pleasing little watering- 

 place near Biarritz, and the date July 29-30, 1903. 



The three butterflies are Ccenoiiympha oedipus—oi course 

 of the southern (western) French form, rather larger and 

 better marked than the type — Heteropterus morpheiis, and 

 Satyrus dryas. They are confined to small boggy or swampy 

 hollows an acre or two in extent — i-arely more than five or 

 six — often a mile or two apart. The two first species do not 

 leave these hollows, and if by any chance a specimen is driven 

 a few yards up the surrounding slopes, it at once begins to 

 work its way back again. 



The third species, ^S'. dryas, is extremely abundant in some 

 of these swamps, and seems to be really equally confined to 

 them, though its abundance and comparative large size and 

 powers of flight lead to its making short excursions up the 



