( xxix ) 



fly sent to him by Dr. Puton ; he remarked how beautifully, and of course 

 correctly, the neuration was shown, and suggested that if possible this 

 method should be used for entomological illustrations generally if it were 

 possible to reproduce the figures in any number, about which he should like 

 to hear some practical opinion. The process by which the photograph was 

 produced is described in 'La Nature' for August 23rd, 1884. 



Mr. R. Meldola said that previous to the meeting he had inspected the 

 photograph exhibited, and was much impressed with the sharpness with 

 which the neuration had been reproduced upon the sensitised paper. He 

 was of opinion that this method might be made of general practical use for 

 the multiplication of any number of copies if instead of printing upon 

 albumenised paper, as had been done in this case, the wing had been 

 exposed in the usual way over a bichromatised gelatine film. By this 

 means a printing-block could be obtained by the well-known methods which 

 would give the neuration white upon a black ground. If, on the other 

 hand, it was found advisable to have the neuration black upon a white 

 ground a glass negative might first be taken by exposing the wing pressed 

 over a gelatine plate, and then this negative, when used to print, over a 

 bichromatised gelatine film would give upon the latter a positive impression, 

 which could, as before, be used as a printing-block. Any transparent wings 

 might be adapted to the process ; in the case of Lepidoptera it would, of 

 course, be necessary to first remove the scales. 



Mr. T. R. Billups exhibited a species of Homalomyia which had proved 

 destructive to a field of coUard, or colewort ; six or eight of the yellowish 

 larvte being found in almost every stalk. One specimen exhibited had 

 seven legs, there being four on the left side ; the posterior leg being 

 doubled from the coxa, the femur was entirely split, and both legs were 

 thence quite perfect and distinct. 



Papers read. 



Baron Osten-Sacken communicated " Facts concerning the importation 

 or non-importation of Diptera into distant countries " 



Lieut.-Col. Swinhoe communicated a " List of Lepidoptera collected in 

 Southern Afghanistan by himself." 



Mr. Rudolph Rosenstock communicated "Notes on Australian Lepi- 

 doptera, with descriptions of new species." 



