( clvii ) 



had a history similar to that of L. arion, and who with the 

 assistance of Mr. H. Powell found that ants would carry off 

 the larva of L. alcon, and that it would lap up the juices of 

 wounded ant larvae, provided me with the young larvae for 

 observation, in both 1916 and 1917, and my success in rearing 

 the insect is entirely due to his initiative. 



My detailed notes have been sent to him to appear in the 

 " Etudes de Lepidopterologie comparee." 



Mr. Powell has seen the larva of L. alcon carried off by 

 Tetramorium caespitum and by Tapinoma erraticum. Acting 

 on this hint Mr. Donisthorpe provided himself with a nest of 

 Tetramorium, and now has a larva of L. alcon. thriving in it. 

 I have larvae in nests of Myrmica scabrinodis and M . laevinodis. 



An outdoor Specimen of the Cockroach. — Mr. Donis- 

 thorpe exhibited a specimen of the common Cockroach 

 (Blatta orientalis) taken under bark of oak in the New Forest, 

 far away from any houses, July 29th, 1918. Dr. Neave and 

 the President commented on this exhibit. 



Ergatandromorph of Myrmica sulcinodis. — Mr. Donis- 

 thorpe also exhibited a curious ergatandromorph of M. 

 sulcinodis taken on Bloxworth Heath, from the collection of 

 the late Rev. 0. Pickard, Cambridge. 



Larval Skins of Dytiscus marginalis.— Mr. Hugh Main 

 exhibited the three larval skins of Dytiscus marginalis, pre- 

 pared for demonstration purposes. Ova were deposited in 

 captivity about the last week in May of this year. The 

 larvae hatched on June 4 and 5. The first moult of one of 

 the larvae took place on June 13, the second moult on June 28, 

 and the pupa was disclosed on July 28. The other larvae 

 passed through the same stages round about the same dates. 

 The empty larval skins were floated out and spread on glass 

 under water, and after drying were mounted up with a cover 

 glass like a lantern slide, strips of cardboard being inserted 

 to prevent pressure on the specimens. 



Experiments in Colour-inheritance in Pediculus 

 h r. max us. — Mr. Bacot, in referring to some breeding experi- 

 ments he had conducted respecting the inheritance of dark 

 and light coloration in Pediculus humanus, explained that 

 his results, which were of an indefinite character, were com- 



