SOCIETIES. 371 



and movements. — Professor Poulton, a family of Papilio dardanus, 

 consisting of the troplwnius parent and the fifty-five offspring reared 

 from her eggs by Mr. G. F. Leigh, F.E.S., of Durban, and containing 

 a new female form leicjhi. The female parent of the family exhibited 

 vi^as captured by Mr. Leigh on June 26th, 1910, at Pinetown, Natal 

 (about 1000 ft.). She laid sixty-two eggs on June 27th-28th, the 

 offspring consisting of twenty-five males, twenty-two cenea females, 

 four troplwnius females, two hippocoon females, and two leicjhi 

 females. There can be no doubt that this variety, bred in Natal by 

 Mr. ^Leigh six times in 1910 and also captured twice in Natal, 

 possesses sufficient stability to rank as one of the female forms of 

 dardanus. Further convincing evidence of its stability as a form is 

 seen in the fact that it also occurs almost unchanged so far away from 

 Natal as the north-east corner of the Victoria Nyanza. A specimen 

 was collected by Mr. A. H. Harrison about 1903 at " Nyangori," a 

 forested locality at a height of about 5000 ft. to the north-east of the 

 great lake. Mr. Harrison's specimen was figured, seven-eighths of 

 the natural size, in Trans. Ent. Soc. 1906, plate xx. fig. 1. It is there 

 spoken of as " intermediate between planemoides and cenea." The 

 l^lanemoides form is entirely unknown in Natal, and indeed in areas 

 far to the north of it, and hence it is impossible to adopt the plausible 

 interpretation of leigki as a hybrid between cenea and a male bearing 

 the planemoides tendency, or vice versa. We are therefore driven to 

 the hypothesis that the leighi form is a persistent definite stage in 

 the evolution of planemoides. Professor Poulton also exhibited an 

 example of the planemoides female captured in August, 1910,_ in 

 forest country (less, and probably much less, than 100 ft. elevation) 

 bet wen Jilore and Malindi. The occurrence of planemoides on the 

 east coast, so far from its Planema models, is of high interest. Pro- 

 fessor Poulton also exhibited a female parent of the dubia form cap- 

 tured on March 19th, 1911, at Oni, seventy miles east of Lagos, by Mr. 

 W. A. Lamborn, together with a selection from the offspring reared 

 from its ova. The offspring included both dubia and anthedon. Thus 

 Mr. Lamborn had been able to verify the suggestion that the forms 

 Euralia anthedon and E. dubia are the dimorphic forms of a single 

 species. It may be added that Mr. Lamborn has now bred families 

 from three dubia parents of various forms, and one from an anthedon 

 parent, all captured at Oni in March of the present year. Both 

 anthedon and dubia appeared in all the families. Mr. W. A. 

 Lamborn had intended to show at this meeting the cases which he 

 had exhibited at the Conversazione, but, owing to a misunderstanding, 

 they had not arrived. He observed, however, that Professor Poul- 

 ton's account of the mimicry of certain Danaine butterflies by 

 Euralias induced him to mention that he recently took at one sweep 

 of the net two butterflies, an Amauris psyttalea, Plotz, and an Euralia 

 dubia, which were flying round and round each other in a manner sug- 

 gestive of courtship. Their movements on the wing were so active that 

 he was unable to recognize them before capture, and it seemed evident 

 that the one must have been deceived by the mimetic resemblance to 

 its own species exhibited by the other. In the exhibit which he had 

 hoped to bring was a West African Hypsid moth determined by 



