98 BRITISH BUTTERFLIES. 



woods opposite the Mont Collon glacier, and beyond again, up the 

 slopes towards the Aiguilles Eouges, where Polyommatus hylas, 

 Latiorina orbitulus, Albulina pheretes, Aricia astrarche, and Cupido 

 minimus keep it company, as well as the more purely alpine species. 

 This is equally true of the Visp and Saas valleys in the whole ascent 

 from Visp to the Gorner Grat, or irom Visp to the Mattmark Lake or 

 to Saas- Fee. Similarly it abounds all over the Reuss valley from 

 Oberalp and Hospenthal to the level of Lake Lucerne ; it occurs 

 equally abundantly in the Upper Engadine from Maloja to Pontresina 

 and thence to the foot of the Roseg glacier and to the summit 

 of the Bernina. It is equally abundant in the Lower Engadine 

 on the roadside between Sus and Lavin with Hirsutina daman and 

 Aricia astrarche, as well as on the slopes above Lavin; it also occurs 

 commonly between Sus and Zernetz, as well as above Zernetz over the 

 Of en Pass and into the Mimsterthal, less abundantly, however, than 

 in the Sus, Lavin, and Pontresina districts. It abounds through- 

 out the Albula Valley, and is very common on the flowery banks 

 between the lovely Lake Palpuogna and the Weissenstein Inn on the 

 Albula Pass. On the southern slopes of the Alps it is equally abun- 

 dant, it swarms almost everywhere between Airolo and Piora, occur- 

 ring in thousands round the sides of Lake Ritom with Plebeius argyrog- 

 nomon, Polyommatus eros, etc., whilst a roadside bank near Piotta, 

 leading down to a flat through which the Ticino flowed, the flat filled 

 at one end with a dense aider carr on the borders of which Eupatorium 

 and other flowers, loved of insects, abounded, swarmed with butterflies 

 in early August, 1907, amongst which A. coHdon flew amid hosts of 

 Aricia astrarche, Plebeius argus, Polyommatus icarus, P. hylas, Cyaniris 

 semiargus, and numbers of other species. On the Alpe Pianascio, above 

 Fusio, it occurs with Polyommatus eros, Brent his ^aZ^.9, Melampias 

 epiphron, Erebia tyndarus, and other purely alpine species. As 

 suggesting an entirely different habitat one maj^ note the tangled edge 

 of the Weesen Marsh, where the river leaves the lake on the way to 

 Zurich, and where a part of the marsh has become comparatively dry 

 and covered with bushes and a really extensive butterfly fauna 

 dwells, and where one finds A. coridon abundantly with a large 

 number of other interesting species. In Vorarlberg and Tyrol, the 

 habitats are very similar to those just described ; it abounds on the 

 wooded slopes of the Pfander, behind Bregenz, whence one obtains a 

 most lovely view of Lake Constance ; it is equally common on almost 

 all the ground between St. Anton and the summit of the Arlberg, 

 whilst on the Postealp, above Brenner, it occurs with many purely 

 alpine species, on the edges of the firwoods as well as on the 

 higher slopes. On the Mendel Pass it is very abundant, swarming on 

 almost every flower, fighting with such species as Dryas j>aj>hia, 

 Argynnis aglaia, Melanargia galathea, Evinephele ianira, E. lycaon, and 

 others equally abundant for a place, whilst, at the little " quelle" on 

 the Mendelstrasse, the imagines hustle the Libythea celtis and Erebia 

 aethiops that sit still absorbing the fluid, until they are made to shift 

 their ground to a quieter spot where they are able to settle down 

 again. It is equally abundant in the porphyry mountains that guard 

 the Eggenthal and the Sarnthal, in the latter quarrelling on the slopes, 

 well up towards Sarnthein, with Erebia nerine, thai hangs in velvety 

 blackness on the flowers, Polyommatus mclcager, Dryas paphia, and 

 other local species. One of its most interesting habitats is the upper 



