xc 



(2) Homoeosis in Lygris {Cidaria) prunata L. This is a 

 male taken at Malvern in 1904 by the Rev. A. Day. On the 

 upperside of the right fore-wing there is a narrow whitish 

 stripe with scales of the same structure and colour of those 

 of the anterior part of the upperside of the hind-wing. It 

 runs through the outer part of the dark basal area, and right 

 across the dark central area of the wing lying in the anterior 

 part of the discoidal cell and along both sides of nervure 6. 

 The underside and neuration are normal, and there is no sign 

 of injury. 



(3) Zygaena trifolU, male, with symmetrical absence of 

 scales in the interneural spaces of both fore-wings, which 

 gives it a radiated appearance. The red scales of the outer 

 two spots on the fore-wings are deficient in pigment and 

 curled up. 



LiMENITIS SIBILLA L., FROM THE NeW FoREST. — Capt. 



K. J. Hayward exhibited an example of Limenitis sibilla L., 

 taken by himself in the New Forest, July 11, 1922, having 

 four symmetrical scaleless patches — one on each wing above, 

 at the interior and anal angles respectively. 



Structure of the tympanic organ in Noctuid Moths. — 

 Dr. H. Eltringham recalled the exhibit by Dr. K. Jordan 

 at a previous meeting of some pre2:)arations showing part 

 of the structure of the tympanic organ in Noctuid moths. 

 In these moths the organ was situated in the thorax, but in 

 the Geometers and some other families it was in the abdomen. 

 As the structure was of considerable complication, and difficult 

 to describe at all briefly, he had made a wax model of it, 

 which, though rather roughly constructed, would probably 

 serve to illustrate the structure fairly distinctly to those 

 who cared to examine it. He had not written anything about 

 it at present, as he was hoping to receive from Madagascar 

 some large Uranid moths from which he expected to obtain 

 fuller information in regard to the nerve structure and dis- 

 tribution. Meanwhile he would urge Fellows, when the 

 opportunity occurred, to make a note of any observations 

 that might indicate a sense of hearing in moths. 



Dr. Jordan called attention to the great importance from 

 a systematic point of view of Dr Eltringham's investigation. 



