71 



Dr. Chapman had noted in Spain the occurrence of a large 

 number of Pyvameis cardui flying around a sweet chestnut 

 tree, and stated that many insects have a gregarious habit or 

 instinct. He had noted that if a portion only of the group 

 were disturbed they would soon return, but that if the whole 

 were driven off together it was not customary for a re- 

 assembling to take place on the same spot. Mr. Adkin had 

 seen a similar assemblage of Thecla qucrcus about a particular 

 oak tree, and Mr. Turner had seen a number of Hcmaris 

 fuciformis assemble at one only of a large number of rhodo- 

 dendron bushes, all apparently similarly in full bloom. 



SEPTEMBER 13th, 1906. 



Mr. Hugh Main, B.Sc, F.E.S., Vice-President, in the Chair. 



Mr. Goulton exhibited along series of Calymnia trapczina, 

 taken at sugar in the New Forest in August, and stated that 

 it was almost the only species he had met with in several 

 nights' sugaring. They showed considerable variation, the 

 type form being in the minority. Many were var. rufa, a few 

 were var. oclirea, and there were also several of the beautiful 

 dark-grey forms, with the transverse lines very well developed, 

 and dark var. grisea (?). 



Mr. Lucas exhibited a spray of the deadly nightshade 

 (Atropa belladonna) , with the berries fully developed. This 

 plant had grown in his garden for some years. He also 

 exhibited a mass of the pillwort (Pilularia globulifera), a 

 heterosporous Pteridophyte, belonging to the natural order 

 Hvdropterideas, and the only British representative of the 

 order. He had found it very common locally in marshy 

 ground in the New Forest this year. Mr. Lucas also re- 

 ported that he had at last found the long-leaved sundew, 

 Drosera anglica, in the New Forest. 



Mr. Hugh Main exhibited a mass of another heterosporous 

 Pteridophyte, belonging to the natural order Hydropteridse, 

 Azolla caroliniana. He had found it covering a pond and its 

 muddy margin at Chigwell. It is a native of tropical and 

 sub-tropical America. On behalf of Mr. Harrison and him- 

 self he also exhibited long, bred series of Hadena contigua and 

 Eucosmia (Coremia) undulata from the New Forest. 



Mr. Barnett exhibited several very dark examples of 

 Abraxas grossulariata, bred from Greenwich larvae. One 

 specimen had the light, submarginal band of the fore wings 



