240 [October, 



F.E.S. of Durban, and containing a new $ form leighi. The female parent was 

 captured by Mr. Leigli on June 26th, 1910, at Pinetown, Natal (aboiit 1000 ft.). 

 She laid sixty-two eggs on June 27th-28th, the offspring consisting of 25 males, 

 22 ce7iea females, 4 trophonius females, 2 Mppocoon females, and 2 leighi females. 

 There can be no doubt that this variety, bi-ed in Natal by Mr. Leigh six times in 

 1910, and also captured twice in Natal, possesses sufficient stability to i-ank 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 N.E. 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 feet to the N.E. of the great lake. Mr. Harrison's specimen was 

 figm-ed I 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 plane- 

 moides 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 leighi 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 per- 

 sistent definite stage in the evolution of planemoides. Prof. 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), between 

 Jilore and Malindi. Jilore is about 70 miles N. of Eabai and 19 W. of Malindi. 

 The occiu-rence of planemoides on the E. coast, so far from its Planema models, 

 is of higli interest. Prof. Poulton also exhibited a female parent of the dubia 

 form captured on March 19, 1911, at Oni, 70 miles E of Lagos, by Mr. W. A. 

 Lamborn, together with a selection from the offspring reared from its ova. The 

 offspring inchided both duhia and anthedon. Thus Mr. Lamborn had been able 

 to verify the siiggestion 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 in- 

 tended to show at this meeting the cases which he had exhibited at the Conver- 

 sazione, but, owing to a misunderstanding, they had not arrived. He remarked, 

 however, that Prof. Poulton's account of the mimicry of certain Danaine bvitter- 

 flies by Evu-alias induced him to mention that he recently took, at one sweep of 

 the net, two butterflies, an Amauris psyttalea, Plotz, and a Euralia dubia, which 

 were flying round and round each other in a manner suggestive of courtship. 

 Their movements on the wing were so active that he was imable to recognise 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 ex- 

 hibit which he had hoped to bring was a West African Hypsid moth determined 

 by Prof. Poulton as Deilemera, probably antinori, Oberth., with the cocoon from 

 which it emerged, which bears a large nvimber of creamy white semi-transparent 

 frothy spheres, which bear a very strong resemblance to the cocoons of Braconid 

 parasites, and dovibtless liave a protective function. He added that he had 

 obtained some light on the relationsliip between the ' brands ' or patches of 

 peculiar scales on the wings of male Danalnae, and the dovible tuft of liairs which 



