THE VALAIS OF SWITZERLAND. 101 



both there and in the Val d'Arolla, the number observed exceeded 40. 

 In the following list I have only enumerated the more interesting species, 

 and have followed Dr. Staudinger's catalogue (1871) throughout. 



Papilio machaon only a few specimens, occurring singly in various 

 localities, but never very high up. Parnassius apollo common about 

 Vissoye, also a few at Evolena and in the Arolla Valley ; this species 

 flies slowly and steadily, but, if alarmed, goes off at a great pace, and is 

 not then easily caught : P. delius this species occurred, flying with the 

 last, in the Val d'Arolla, and was rather abundant on the slopes of the 

 Col du Torrent, above the Val d'Herens ; both it and P. apollo vary much 

 in the size, number, and intensity of the red ocelli and spots ; this species 

 is not found so low as P. apollo, not, according to our experience, much 

 below 6,000 ft. : P. mnemosyne this species occurred with the last in the 

 Val d'Arolla, and on the Col du Torrent ; the curious ovisac, with which, 

 in this genus, the females are provided, is, in P. mnemosyne, much larger 

 than in the other two, and of a white colour; all the three species 

 frequent the wetter slopes on the sides of the valleys : the occurrence of 

 three species of this genus together in exactly the same locality, as was 

 the case at one point in the Val d'Arolla, is certainly very remarkable, 

 considering the resemblance in habits of the different forms. Aporia 

 cratceyi one of the most abundant butterflies in Switzerland, and extend- 

 ing some height up. Pieris napi, ab. $ bryonia* a few in the Val 

 d'Arolla, and on the Col du Torrent and Furka, with males of the 

 ordinary form ; specimens vary considerably in darkness : P. callidice 

 not common in the Arolla Valley, especially at Arolla itself, and a few 

 on the Col du Torrent, Purka, and Bella Tola at high elevations (8,000 

 ft. or so) ; the flight of this species resembles that of a Colias, more than 

 that of our ordinary English whites. Euchloe belia, var. simplonia this 

 species occurred with the last in the Val d'Arolla, and was rather 

 numerous in the meadows outside the inn there. LeucopJiasia sinapis 

 verv common at Evolena and elsewhere. Colias phicomone a few of 

 this mountain species in the valley at Evolena, but commoner on the 

 slopes around and higher up the valley towards Arolla ; also on the MM 

 Furka and Bella Tola. Tliecla rubi two or three specimens at various p. 277 (1879). 

 places ; on the Bella Tola at about 6,500 ft. Polyommatus virgaurece 

 males very common in the valley at Vissoye, also in the Turtman Thai 

 and near Zinal, but I only saw a single female ; one male from Vissoye 

 is remarkable for being of a yellow colour above: P. hippothoe, var. 

 eurybia this alpine form of liippothoe, from which it differs in the 

 duller colours of the male, and in the female being almost unicolorous 

 brown above, and greyer beneath, occurred sparingly at Evolena, more 

 commonly at Vissoye, where it occurred with P. virgaurece, and also on 

 the St. Gothard route, between Andermatt and Amsteg : P. dorilis, var. 

 two specimens, one at Evolena, the other on the Bella Tola ; 



