90 



black spots edged with white are more pronounced. The 

 colour of the red band, too, is much more vivid. In the black 

 form the red band is much widened and very brilliant. 



2. Polyommatus argia. — This species is almost indis- 

 tinguishable from our P. icarus except in being larger. 



3. PlehiiLs cegon. — The colour and markings agree most 

 accurately with British specimens, but these latter are 

 miniatures. 



4. Cyaniris argiohts. — The points of difference are to be 

 found mainly on the under side The delicate blue has given 

 way to a grey tint with a faint tinge of blue. All the 'spots 

 are more decided, and not mere spots, as in British examples. 

 The two broods are, as in Britain, dimorphic, but the summer 

 brood is of a much darker colour. 



5. Everes argiades. — These were similar to the average 

 European specimens. 



Mr. MacArthur exhibited a long series of Argvnnis aglaia 

 taken near Brighton, all bright and well-marked specimens. 



Mr. West exhibited a series of the Homopteron Typlilocyha 

 candidnla, beaten from white poplar on Blackheath. It had 

 not previously been found in Britain. 



Mr. Turner exhibited, on behalf of Mr. Edwards, a long 

 series of Saturnia pavonia, bred from ova laid by a female 

 captured at Digne in April, 1898. The first contingent of 

 twenty-one specimens emerged between March nth and 

 April 17th, in 1899, and were all males. The remainder, 

 nine specimens, did not emerge till April of this year, 1900, 

 and consisted of two males and seven females. 



Mr. Blenkarn reported that he had taken Ischnura pumilio 

 in Abbot's Wood. 



Dr. Chapman exhibited specimens and drawings illus- 

 trating the structures which exist in the imago of Cnetlwcampa 

 pityocampa, by means of which it manages to escape from the 

 papery but tough silken cocoon (Plate III). "These struc- 

 tures have been described before, but any reference to their 

 uses has not been found. They consist of an armature of the 

 head and spines of the first tibia, by means of which the 

 cocoon is penetrated and torn or cut in a somewhat ragged 

 but fairly straight line across the summit of the cocoon and 

 for some distance down one side. The head armature consists 

 of a dense chitinous plate occupying the whole front of the 

 head from the palpi to the vertex, and rising into a broad or 

 rather double ridge of fairly equal width throughout its whole 

 antero-posterior extent. The sides of the ridge fall vertically 

 to the surface of the head, except where a slight spreading 



