( xliii ) 



slopes, aud an odd one or two was even seen on the levels 

 above. 



The only other butterflies seen in the bogs at the same time 

 are comparatively rare — viz. a few Brenthis euphrosyne and 

 Augiades Sijlvanus. The country ai'ound and above abounds 

 in various common buttei-flies ; the common " whites," Lep- 

 tidia sinapis, Colias edtisa, and C. hyale, several Vanessas, 

 Satyrus arethusa abundant, and Epinepliele tithonus in swarms ; 

 Pararge segeria, Co&nonympha arcania, Chrysophanus pililxas, 

 etc. None of these visit the swamps except by rare accident, 

 C. ednsa, which goes straight across everything, being in fact 

 almost the only species doing so. 



Last year, at St. Jean de Luz, we found S. dryas and 

 H. morplieus on very similar ground, but G. c&dipus was 

 wanting. This was in a swamp or bog at nearly sea-level 

 in the open river valley. C. cedipus appears to require the 

 protection afforded by the steep slopes, surrounding on all 

 sides the hollows in which we found it. These hollows are 

 the upper ends of small streams, perhaps a couple of miles 

 from the sea, and the little valleys wind enough for one to 

 say that the sw^amps are surrounded on all sides by very steep 

 slopes of 100 to 300 feet, rising to the general low undvilating 

 country behind Guethary, the highest point of which cannot 

 be of more than 500 feet elevation. 



I have found S. dryas in various localities, generally on 

 low-lying or shady, and, I imagine, more or less boggy 

 ground. Here and there, as at Aix, I have met with it where 

 I thought it abounded on dry slopes, but I suspect it must 

 really have belonged to damp places adjacent. Nor have I 

 anywhere else than at Guethary been so impressed by its 

 slow, floppy flight. I must confess, however, that I have 

 usually regarded it as too common a butterfly to be worthy 

 of much attention. 



In the Entomologist's Monthly Magazine for 1894, p. 221, 

 Mr. W. E. Nicholson notes the association of these three 

 butterflies in a marsh near the Lac de la Negresse, near 

 Biarritz. He places with them S. arethusa and S. statilinus, 

 not, perhaps, thinking it necessary to mention, what he tells 

 me is stated, however, in his diary, that these two butterflies 



