( xcv ) 



Country, be invited during the continuance of the War to 

 attend the Ordinary and Annual Meetings of the Society, 

 and to make use of the Society's Library, in the same manner 

 as though they were themselves Ordinary Fellows, except as 

 to the right of voting." 



This was seconded by Dr. Burr, and carried unanimously, 

 the President observing that the suggestion had originally 

 been made on behalf of the Belgians, for whom Englishmen 

 must feel that they could not do enough, and that the 

 invitation had been naturally extended to our other allies. 



Exhibitions. 



Isolated Colonies of Anthrocera (Zygaena) trifolii, 

 AND Parasemia plantaginis. — Commander Walker ex- 

 hibited, on behalf of Dr. R. C. L. Perkins, specimens of 

 A. trifolii and P. plantaginis showing the effects of isolation, 

 and read the following notes contributed by Dr. Perkins : — 



The two small series of Zygaena trifolii were captured in 

 June of this year on Dartmoor. Each series is from a different 

 colony, the distance between the colonies being only about 

 200 yards, and the intermediate ground is untenable by the 

 species, as also is all the land immediately round each colony. 

 The ground occupied by each is about 15 square yards and 

 is very boggy, in both cases covered with rushes and in one 

 also with Sphagnum moss. 



The colonies have been observed for about five years, but 

 are so weak, that only three or four individuals have been 

 noticed in some seasons. This year each consisted probably 

 of about 100 individuals, and those taken were captured on 

 the first day of emergence. It had been observed in former 

 seasons that the variation exhibited by these colonies was 

 very different, but owing to their weakness they were left 

 alone. It will be seen that the individuals from the Sphagnum- 

 covered area (series A) are of larger average size, and either 

 have all the spots distinct or at most the two middle ones 

 confluent. 



Those from the other colony (series B) are mostly of small 

 size, and most of them have either the three apical spots 



