( cliii ) 



the form tellus of the latter were not present in a former 

 large collection from the same locality two years ago. 



Monstrosity in Leptothorax acervorum, F.— Mr. Donis- 

 thorpe exhibited a very remarkable monstrosity of an ant, 

 which had been sent to him by Mr. R. Butterfield of Keighley, 

 who had taken it on April 26, 1918, in a mixed nest of Myrmica 

 ruginodis, Nyl, and Leptothorax acervorum, F., at Mauley Bog, 

 who suggested it might be a parasite. Mr. Donisthorpe 

 pointed out that it w T as a monstrosity of the Leptothorax, 

 being a small deflated $, but unlike all the Myrmicine ants, 

 it only possessed one very small joint joining the epinotum 

 to the gaster, instead of a pedicel of two joints, the petiole 

 and post-petiole. 



He also exhibited a specimen of Elater sanguinolentus, Schr., 

 taken on Wimbledon Common, May 28, 1918. He said that 

 when hunting for bees, etc., for Mr. Morice, he noticed this 

 beetle in some numbers, and as far as he was aware it had 

 not been taken on Wimbledon Common for twenty-five years. 



Aberrations op British Rhopalocera. — The Rev. G. 

 Wheeler exhibited a specimen of Pararge megaera, L., ab. $ 

 mediolugens, Fuchs, taken at Guildford on May 31st, and 

 observed that it was the first time he had met with this form 

 either in England or abroad. All the specimens of this 

 species met with on this day were unusually dark. He also 

 showed a fine specimen of the brassy aberration intermedia, 

 Tutt, of Rumicia phlaeas, L., taken at the same time and 

 place. 



Method of formation of ' ; Cuckoo-spit," by Philaenus 

 spumarius. — The President said that, as the nymph of 

 Philaenus spumarius — the common " cuckoo-spit " insect — was 

 now very abundant, and specimens for observation were easily 

 obtainable, he wished to call attention to a remarkable 

 peculiarity in its abdominal structure, which he had noticed 

 when examining the insect a few days ago, and to which he 

 could find no reference in any of the text-books or other works 

 he had had time to consult. The peculiarity consisted in 

 the fact that the tergites and pleurites of the abdomen from 

 the 3rd to the 9th, instead of ending as usual at the sides 

 to form lateral edges, are curved round and continued under- 



