37 



They included, amongst others, examples of insect 

 anatomy, such as — i. Antennae of Cockchafer and Vapourer 

 moth {Orgyia antiqtia). 2. Hairs of larva of Vapourer moth. 

 3. Fore-leg of Dytiscits marginalis, high and low magnifica- 

 tions, the former showing the suckers at the end of the 

 trumpet-shaped tubes very clearly. 4. Portion of trachea 

 of larva of Dytiscus. 5. Blow-fly, proboscis and foot. 

 6. Compound eye of Hydvophilns piceiis. 7. Parasites of 

 various kinds ; concluding with a fine example of the 

 Rontgen ray photography, the subject exhibited being a 

 lady's hand with a needle embedded in the tissues, the eye 

 of the needle being plainly visible. 



It may be noted that when thrown upon the screen the 

 magnification of these objects in some cases was as high as 

 3,000 or 4,000 diameters. The advantages of photography 

 in thus demonstrating the minute structure of insect life 

 are obvious when it is remembered that structure and 

 detail are reproduced with absolute truth — detail which it 

 would be well-nigh impossible to portray by any other 

 method. 



APRIL 9th, 1896. 



R. South, Esq., F.E.S., President, in the Chair. 



Mr. Robert Adkin exhibited two specimens each of Mar- 

 garodes unionalis and Mecyna polygonalis, all of which were 

 taken by the late Mr. W. H. Tugwell, at Deal, in 1877 ; also 

 an example of the latter species from the Canaries for com- 

 parison. He said the sporadic appearance of these and 

 other species of Pyrales in various parts of the globe was a 

 matter of very considerable interest as bearing upon the 

 question of migration. No one, he supposed, would say 

 that either of the above species was indigenous in this 

 country, and indeed a comparison of the Deal and Canary 

 specimens of M. polygonalis now exhibited would show the 

 travel-stained appearance of the former. Not only did he 

 think that the presence of these rarer species in this country 

 was due to migration, but the occasional abundance of some 

 of even our comparatively abundant species was due to the 

 same cause. Nomophila noctuella was a case in point ; often 

 after a comparative scarcity the South Downs were infested 

 with multitudes of worn examples of this species. 



It was remarked that the specimens exhibited were taken 

 in a peculiarly sheltered spot at Kingsdown, the M. unionalis 

 among Spilodes palealis, and the M. polygonalis on the flowei 



