123 



one worker was then engaged. Before mid-day this one had retired. 

 The wasps had evidently come to the conclusion that so large a 

 hole as the first was not necessary ; and I agreed with them. 

 The same evening I again covered up the opening with another 

 piece of netting, and next morning two artificers were at work 

 on it. At mid-day there were two holes, one above the other, 

 each about three inches across. There I am content to leave 

 the matter, feeling assured that the work was done deliberately 

 with a definite end in view." 



[No further obstruction was put in their way, and these two 

 holes sufficed to the end of the season. — E. S.] 



SEPTEMBER llth, 1913. 



Mr. Ashdown exhibited the imago of Hijlen eitphorbi(c, bred by 

 him on September 3rd from a larva taken at Aigle, Switzerland, on 

 June 29th, 1913. 



Mr. Turner exhibited a larva of Mainestra (Hadena) pifii, found in 

 his garden at New Cross, and which fed readily upon Michaelmas 

 daisy, upon which it had, presumably, been feeding when captured. 



Mr. W. G. Sheldon exhibited a collection of Heterocera taken by 

 him in Arctic Sweden and Arctic Norway daring the summers of 

 1911-12. It comprised eighteen species, of which ten were also in 

 the British Fauna. Species which here, and in the Alps, were high 

 mountain forms, were, in these Arctic regions, found nearly down 

 to the sea-level, e.g., Plusia hoclienwartld, Anthrocera exidans var. 

 vanadis, Psodos coracina (trepidan'a), etc. Many of the forms were 

 smaller than their more southern representatives, <?.//., Xanthorho'e 

 (Melanippe) niontanata, Entepkria (Larentia) casiata, Corewia 

 mnnitata, etc. Some responded to their surroundings in the chalky 

 areas of the mountains and became light, e.g., Gnophos sordaria. 

 Eiihjpe {Melanippe) hastata was a somewhat darker form than that 

 found in Britain. He referred to the fact that some species laid 

 their eggs between 12 and 1 a.m., and that it was quite possible to 

 collect, especially Geometers, at midnight. Besides the species 

 mentioned above, Mr, Sheldon exhibited Anarta zetterstedtii, A. 

 cordigera, A. melanojui, A. richardxoni, A. meloleuca, Pacnobia 

 hyperborea (alpina), Xanthorho'e [Melanippe) Jin ctuata, Cidaria frigi- 

 daria, and C. polata. 



Mr. West (of Greenwich) exhibited examples of the wasps Vespa 

 gennanica, V. sglvestris and V. vulgaris, and the points of differentia- 

 tion were demonstrated. 



