( ^v ) 



an Erycinicl butterfly, the last mimicking the Ithomine, and the 

 Hypsid moth sharing the dangers by mimicking the Ithomine. 



Mr. DuCane Godman remarked that in these regions many 

 different forms of the same butterfly would often occui- 

 within a radius of fifty miles, showing a wide range of 

 variation. 



Professor E. B, Poulton exhibited cocoons of Malacosoma 

 neusfria collected by Mr. Hamm in 1900, spun upon black- 

 cui'rant and apple-trees in his garden at Oxford. All of them 

 had been attacked by bii-ds through the leaf, this being the 

 thinnest part of the cocoon, and the pupa thus more easily 

 abstracted. With regard to the resting habit of Hyhernia 

 leucophearia he said that J\Ir. Hamm had observed that this 

 moth usually rested with its body in a horizontal position. 

 In this way the light and dark markings of the wings appeared 

 vertical, fitting in with the shadows of the natural cracks and 

 crevices of the oak bark. 



Dr. LoNGSTAFFE Said that all the specimens he had observed 

 on green stems affected a similar position, and that he had only 

 found one on a birch-tree. Mr. M. Jacoby said that he never 

 found the species on oak at all, but on palings, also in the 

 same position, which facts Professor Poulton said tended to 

 show that the protective instinct of the species was retained 

 in such localities. 



Mr. G. T. PoRRiTT exhibited two bred black Larentia midti- 

 strigaria from Huddersfield, and said that the dark form was 

 rapidly increasing in Yorkshire. Of those already emerged and 

 reared from the same brood, three were normal and two dark. 



Papers, etc. 

 Dr. Frederick A. Dixey, M.A., M.D., read a paper, illus- 

 trated by lantern slides, entitled : — " Notes on some cases 

 of Seasonal Dimoi-phism in Butterflies, with an account of 

 Experiments made by Mr. Guy A. K. Marshall, F.Z.S." 

 He said that he had long since formed the opinion that 

 Cat02Jsilia crocale, Cram., was specifically identical with C. 

 pomona, Fabr., and had suspected that the differences between 

 them might prove to be seasonal in character. The belief in 

 their specific identity was held by Piepers and by de Niceville, 



