PLEBEIUS ARGUS. 285 



8th, 1907, at the Ganter Bridge, July lOth-llth, 1907, in the Laquin- 

 thal, July 12th, 1907, at Alpien, July 13th, 1907, on the Rossboden 

 Alp (Rehfous); June 14th, July 28th, August 1st, 1907, at Tattone 

 (Faller); June 11th, 1907, at Uzes, June 16th, 1907, at Giens, June 

 I5th, 1907, at Carqueiranne, June 17th, 1907, at Lavandou, June 

 24th, 1907, at Digne, July 16th, 1907, at Airolo, July 19th, 1907, at 

 Fusio (Blachier); July, 1907, at Monterfil (Oberthiir); June 20th, 1907, 

 in the Bois des Freres, July 8th, 1907, at Schallberg, July 11th, 1907, at 

 Branson, July 12th, 1907, on the Alpien Alp, July 14th, 1907, at Gondo, 

 July 25th, 1907, at Randa (Reverdin); July 9th, 10th, 1907, in the 

 neighbourhood of the Lac de Mouriscot, near Biarritz, very common 

 (Keynes) ; July, 1907, at Pontresina (Bethune-Baker) ; July 10th, 



1907, at Vizzavona (Faller); July 31st, 1907, in the Goeschenen Thai, 

 August 2nd, 1907, at Brugnasco, August 4th, 1907, at Piotta (Tutt); 

 August 8th-13th, 1907, at Champery, August 15th-22nd, 1907, at 

 Evolene (Page); August 14th-25th, 1907, in Bihar C. at Czehtelek, 

 and August 30th, 1907, at Bishopsbad (Rothschild) ; May, 28th, 1908, 

 at Allondou (Reverdin); May, 1908, in Hajdu C. at Nadudvar, June 

 18th, 1908, in Sopron C. at Csorna, July 21st, 1908, in Verzprem 

 C. at Also Ors, July 27th, 1908, at Almadi, September 23rd-25th, 



1908, in Bihar C. at Czehtelek (Rothschild); June 2nd-8th, 1908, 

 between Budafok and Kelenfold, June 10th-14th, 1908, at Cserna 

 (Rosa); June 3rd, 1908, at Stafa, July 20th, 1908, at Klonthal 

 (Glarus) (Muschamp); June 11th, 1908, at Versoix, August 9th, 1908, 

 at Steinenalp (Reverdin); June 14th-17th, 1908, at Carcanieres (Jones); 

 June 21st-July 16th, 1908, at La Granja (Lowe); June 28th-August 

 3rd, 1908, at St. Maurice-sur-Moselle, July 7th, 1908, at Le Tholy, 

 July 29th, 1908, at Charmes (Gibbs); June 28th, 1908, on the lower 

 slopes of the See Alp (Dadd); August 9th- 10th, 1908, above Lavin 

 August 14th, 1908, on the Ofen Pass, above Zernetz (Tutt); 

 August 23rd, 1908, at Ceinturon, near Hyeres. in fine condition 

 (Powell). 



Habits. — Among the rough herbage of the chalk downs, where, for 

 perhaps 500 or 600 square yards, patches of brambles form an almost 

 impenetrable tangle two or three feet in height, with bushes of dog- wood, 

 hawthorn, and blackthorn, and tall masses of golden-flowered Senecio 

 ;«co6rtm, purple Echium, and pink-flowered Ononis interspersed, whilst the 

 slopes around are covered with an abundance of short herbage, including 

 Helianthemum , Lotus, Anthyllis, Or?iithop us, etc., a fairly quick-flying blue, 

 darts smartly from one place to another, and then suns itself with open 

 wings, or busily sucks a nectarial draught. You are inclined to pass 

 it for Polyomuiatus icarus, but the species is Plebeius aef/on. Late in 

 the afternoon the same butterfli s may be sren preparing ft>r the night's 

 rest, usually rather hi^h up on he chosen plant, sitting iiead uowu- 

 wards, the abdomen consideiably lifted from the resting-surface, the 

 forewings tucked very deeply down between the hindwings. In 

 August, 1908, some specimens were observed on the slopes between 

 Lavin and Guarda, in the Lower Engadine, one afternoon when the 

 sun disappeared repeatedly behind heavy cumulus clouds, flying very 

 gently only whilst the sun shone ; in colour on the wing, the males, 

 much darker than those of our home chalkhills, were not unlike 

 small Cyaniris semiargus, settling on leaves, and working them- 

 selves round until they rested with the head downwards, the 



