( xviii ) 



" It is to be noted that there are a good many species whose 

 appendages seem more or less intermediate between those of 

 argus and argyrognomon and I show you on the screen photo- 

 graphs of five such species that most resemble argus in having 

 large spines. It is to be noted that all these intermediate 

 species (intermediate qud genitalia) are abundantly different 

 from both argus and argyrognomon in external characters. 

 Argus and argyrognomon are the only European species of 

 this group (except the very local P. zephyrits and its var. 

 lycidas), and they resemble each other more in Europe than 

 they do elsewhere. 



" This circumstance seems to point to their having been 

 rather widely apart within their own small group ; but that 

 they have approximated in external characters where they 

 have again occupied very similar habitats." 



At this point the discussion was adjourned, owing to the 

 lateness of the hour. 



Wednesday, April 7th, 1909. 

 Br. F. A. DixEY, M.A., M.D., President, in the Chair. 



Exhibitions. 



Mr. E,. Shelfoed exhibited a case containing a number of 

 examples of mimetic Oriental Blattidae, the models being 

 Coleoptera, principally C occinellidae and Chrysomelidae. 



Ova of Tapinostola fulva. — Mr. H. M, Edelsten exhibited 

 ova of Tapinostola fulva {in situ) laid within the curled leaf of 

 Carex paludosa. Also a photograph of the anal segments of the 

 $ showing the ear-like appendages, from the venti^al side. 

 These when not in use are carried flat as in the photograph, 

 but when the $ is going to lay, they are folded together and 

 thrust between the curled edges of a leaf to force it apart ; the 

 fold makes a hollow in which the ova are deposited ; and the 

 leaf closes over the ova when the appendages are withdrawn. 



Discussion on the two similar species Plebeius argus 

 ( = aegon), and p. argyrognomon. — The discussion adjourned 



