CYANIRIS SEMIARGUS. 311 



extending for many acres, formerly no doubt a lake, and now sparingly 

 covered with larches and wild flowers ; this is an excellent locality for 

 C. semiargus, as well as for Hirsutina dam on, Ayriades coridon, Aricia 

 donzelii, and swarms of Plebeius aryyroynomon. The wind-swept 

 slopes of the Mont de la Saxe, the pastures of the Val Ferrex, and the 

 upland pastures of Chavanis, far above Cogne, present a marked 

 contrast with the lovely wooded slopes of the Val Anzasca, where the 

 species also occurs in abundance ; indeed, this beautiful valley 

 reminds one rather of the conditions occurring around Locarno, and 

 in the Valle Leventina in Ticino, where this species also is found 

 commonly. In Germany it is reported to occur in Mecklenburg, in 

 marshy meadows, moist open fields, on the edges of forest and marsh 

 lands (Schmidt), and to be not rare in all the woods and meadows near 

 Friedland (Stange); in meadows, by roadsides, and in forests at Liibeck, 

 but rarer than Polyommatus icarus (Tessmann); loves dry and moist 

 localities, e.g., meadows, outskirts of woods, woodland glades, road- 

 sides, fields and slopes, at Parchim, etc. (Gillmer); and occurs in moist 

 meadows at Pennin in Pomerania (Spormann) ; it also occurs in the 

 North Sea Islands, e.g., in the Sylt Islands with Polyommatus icarus 

 (Werneburg); it is noted as common in meadows at Liineburg 

 (Machleidt and Steinvorth); on dry lawns at Hanover (Peets); some- 

 times abundant in the Rhine meadows near Uerdingen, Friemersheim, 

 etc. (Stollwerck), also in grassy places and in meadows near the 

 Ehine (Rothke); in meadows, forests, and forest glades in Hesse 

 (Koch); whilst it is very common in early summer in forest openings in 

 the mountainous localities, especially in the Hinterland, Winterstein, 

 etc., although it is quite rare in the lower regions (Glaser) ; it occurs 

 in a sloping dry meadow on the outskirts of a wood at Wiesbaden 

 (Prideaux), but it is rather rare in the forest glades of the Taunus 

 (Rossler), and near Oberursel (Fuchs), whilst, at Braunfels, in the 

 Taunus, in mid-August, 1900, it occurs chiefly in damp meadows 

 which happen also to be the best Lycasnid ground in the neighbourhood, 

 Lycaena euphemus, L. areas, and more sparingly L. avion, occurring in 

 the same place; a wide stream runs through the meadows, and the 

 flowers apparently last here longer than on the higher ground, and 

 attract the butterflies (Sich); it occurs throughout Waldeckin somewhat 

 moist meadows (Speyer), and prefers flowery slopes at Zeitz-on-Elster 

 (Wilde); in Anhalt, it occurs sparingly on heaths, by the edges of 

 forests, and in dry meadows and grassy pastures (Gillmer), and at Werni- 

 gerode in forest-glades (Fischer), it inhabits the meadows, woods, and 

 fields throughout Posen (Schultz), is found in Silesia, in forest-glades, 

 on the outskirts of woods throughout Upper Lusatia (Moschler), 

 and on the lowlying heaths at Siegersdorf (Sommer), whilst in meadows 

 on the foothills of the Silesian mountains it is common, but rarer in the 

 plains (Wocke); it is one of the most abundant "blues" in the Sprottau 

 district, occurring in meadows, by the sides of roads, etc., in two broods 

 (Pfitzner); it is chiefly found in forest-glades at Dresden and in the 

 mountainous parts of Saxon Upper Lusatia, being strangely reported 

 as most abundant in cabbage-fields near Reudnitz (Ent. Ver. Fauna), 

 and is said to prefer roads and clearings in forests in Wiirttemburg 

 (Loffler), whilst, in Baden, it occurs in the mountains and foothills up 

 to 3600ft., and is specially noted as occurring around the sources of 

 the Danube (Reutti); it was locally abundant at the end of May, 1906, 

 near Lahr, on small limestone hills at the edge of the plain, although 



