62 THE YOUNG NATURALIST. 



garden insect in the suburbs of London. Now entirely confined to the fens, 

 and as they become drained and cultivated it will certainly disappear. 



2. Pieris Ckattegi. Becoming quite a rare butterfly, and quite gone from 

 many places where it once was met with in abundance. . 



3. Argynnis Aglaia. Not nearly so common as of old. I have not 

 seen it in this district for more than twenty years, though it occurred former- 

 ly in Castle Eden Dene, and most of the woods and denes in the county. 



4. Vanessa C- album. Mr. Stainton remaiked thirty years ago that this 

 species had disappeared from many of its former haunts. I have seen it so 

 abundant here that half-a-dozen might be taken in the net at one stroke. It 

 has not been seen for fully twenty years. In the hop counties it still seems 

 to retain its hold, though generally scarce. 



5. Vanessa Io. When I commenced to collect, the larvge might be found 

 on every patch of nettles. I have not seen them for many years, and rarely 

 observe the perfect insect. ■ The same remark applies to many other places. 



6. Satyrus iEGERiA. Has disappeared from many large districts, and is 

 far from being " generally distributed " now. It is in the old lists for this 

 county, but I have never seen or heard of it in my thirty year's collecting. 



7. Satyrus Meg^era. The same remark applies to this species. When I 

 commenced to collect it was one of the most abundant butterflies here. It 

 disappeared suddenly and we have never seen it since. I believe the dis- 

 appearance was not confined to this county .but was of much wider extent. 



8. Satyrus Hyperanthus. Disappeared from this neighbourhood at the 

 same time, and has never reappeared to my knowledge. 



9. Chortobius Pamphilus. Has quite gone from large tracts in the West 

 Eiding of Yorkshire, where it was formerly common. 



10. Lyo/ENA Alsus. Disappearing in many places. It has left this dis- 

 trict for many years. 



11. Hesperia Sylvanus. The same remark applies to this also. Only one 

 specimen has been taken in this district during my time, though old records 

 speak of it occuring freely. 



I might also add to the list M. Artemis, P. Phl^eas, and L. Argiolus, 

 and others if necessary, but these are enough for my argument. 



I have now enumerated twenty butterflies, of which one at least is already 

 extinct, several only keeping on our lists by immigration, and a still larger 

 number that, while common where they occur, are disappearing from exten- 

 sive districts, and not again spreading over them. If this be borne out by 

 the facts, the question naturally arises — How long has it been going on, and 



