( XV ) 



specimens, unusually dark, the other, which was much rubbed, 

 had apparently never had any black marks on the upper 

 side. 



The Rev. G. Wheeler observed that he was quite satisfied 

 that in Central Europe the species were distinct, as not only 

 their wing-markings, but their habits, habitats and time of 

 appearance were different, arsilacJie, for instance, being con- 

 fined to marsh-land and appearing nearly a fortnight later 

 than pales. 



Mr. Sheldon said that in the Hohe Tatra they appeared 

 about the same time, as he had taken B. arsilache at 3000 ft. 

 and pales from 6000 to 7000 ft. within a day or two, the actual 

 dates being July 7th for pales, and July 5th and 10th for 

 arsilache, in each case newly emerged cJ ^ only being obtained. 

 He also observed that while the two forms seemed to be 

 sufficiently distinct in Southern Scandinavia, yet in the 

 North and in Lapland all forms were mixed together and 

 there was no dividing line. The question depended on what 

 is a species. 



Mr. Wheeler in reply said that, as he understood it, a 

 species consisted of individuals that paired freely in nature, 

 and that it was quite possible that B. pales and B. arsilache 

 were still one species in the far North (probably their ancestral 

 home), but had become distinct where they were kept apart 

 either by altitude or different times of appearance. He 

 added that arsilache was a fortnight later where the two 

 forms overlapped in the Engadine, but that with 3000 ft. 

 between them in altitude their time of appearance would 

 probably be the same. 



Mr. A. H. Jones corroborated Mr. Wheeler's statements 

 with regard to the time of appearance and difference of habitat 

 in the Engadine. 



Dr. Jordan said that to add to the confusion, Esper had 

 figured arsilache and called it pales. 



Gynandromorphous Lepidoptera. — Dr. Cockayne ex- 

 hibited : — 



(1) Gynandromorphous Agriades coridon, from Royston, 

 Aug. 1914. The specimen was predominantly female, var. 

 semisyngrapha, the wings on the left side being smaller than 



