92 



picture. Male Sympetrum striolatum, clasping female per coll 

 while she was ovipositing. Emergence of Erythromma naias 

 from the puparium, shewing five stages. Eggs of eleven 

 species of British Odonata. Full-grown nymph of Anax 

 imperator. Anax imperator nymph using its mask to seize a 

 worm. Male and female Agrion mercuriale, taken in New 

 Forest in August, 1897, with an enlarged view of segments 

 1 and 2 of abdomen. Male Calopteryx virgo. Male of the 

 same, with pigment absent from one fore-wing. Female of 

 Calopteryx virgo, with hind wings dark, and having a trans- 

 verse darker band near the tip. Male Calopteryx splendens. 



MARCH 24th, 1898. 



Mr. J. W. Tutt, F.E.S., President, in the Chair. 



Mr. R. Adkin exhibited a short series of Grammesia 

 trigrammica (= trilinca, Bork.), in which the ground colour 

 of the wings was so much darkened that the usual trans- 

 verse lines were obliterated in some of the specimens. He 

 said these dark-coloured examples were known as the Lewes 

 form, and asked whether it was within the knowledge of 

 members present that a similar form occurred elsewhere in 

 any such considerable numbers as it did in the neighbour- 

 hood of Lewes, where the specimens exhibited were taken 

 last year. 



Mr. Tutt stated that he had only found very few dark 

 specimens in the woods of North Kent, and knew of but few 

 being taken in the neighbourhood of London. Mr. Turner 

 said that some years ago Messrs. Porritt and Tugwell took 

 a very considerable percentage of the dark forms in the 

 Hailsham woods. 



Mr. H. Moore exhibited a pale pigmented variety of 

 Anosia menippe {archippus) from the Malay Archipelago, and 

 stated that he had never before seen any such variation of 

 this species. He said that neither Mr. Mansbridge nor Mr. 

 Pearce knew of a similar form in America. Mr. Birch 

 stated that he had seen thousands of the species, but had 

 never met with a similar variety. Mr. Tutt described the 

 migrations of the species from south to north as observed in 

 America, and noted that fifty years ago it was exclusively a 

 New World species, whereas now, with the spread of its 

 food-plant, it was cosmopolitan. 



Mr. Cant exhibited for Mr. Birch a series of strongly 

 marked specimens of Hybernia defoliaria from Dean Forest, 



