6D 



EXTEACTS FROM THE PROCEEDINGS 



OF THE 



ENTOMOLOGICAL SOCIETY OF LONDON 



(March 3kd — December Ist, 1909). 



Wednesday, March 3rd, 1909. 



vi] 



Mendelisim in Acidalia virgularia, Hb. — Mr. L. B. 

 Prout, on belialf of himself and Mr. A. Bacot, brought for 

 exhibition a very extensive series of Acidalia virgtdaria, Hb., 

 bred in ten successive generations from various crossings of 

 the London and Hy^res race, which had been undertaken with 

 a view to the further study of Mendelism. The results showed 

 non-Mendelian inheritance, there being no segregation with 

 pure and hybrid forms in definite proportions ; and thus sup- 

 ported Mr. Bacot's opinion that such were only to be expected 

 in cases of hybridization of forms in which Natural Selection 

 had virtually eliminated intermediates, or in other words, that 

 apparent Mendelian phenomena were manifestations of selective 

 purity, rather than of gametic purity, 

 vii] 



A discussion followed in Avhich Mr. Bacot, Dr. T. A. 

 Chapman, Mr. G. Meade-Waldo and the President took part, 

 Mr. A. Harrison pointing out that in similar experiments 

 conducted by himself with Mr. H, Main with British Pieris 

 napi X P. var. hryoniae from Switzerland cariied through three 

 generations, they had quite failed to obtain Mendelian pro- 

 portions, but in the case of Ajilecta nebidosa the Mendelian 

 pioportions wei-e absolute. (Cp. Proc. Ent. Soc. 1907, p. liv.) 



Pajjers. 



Mr. G. A. K. Marshall, F.Z.S., read a paper entitled 

 " Birds as a Factor in the production of Mimetic Resemblances 

 in Butterflies." He explained that one of the chief criticisms 



