Ixxx 



Dr. Eltringham gave some account of similar organs in 

 Geometrids. Mr. Swynnerton said that in the course of 

 some experiments on the food preferences of birds, he had 

 been unable to detect that Noctuid moths have the power of 

 appreciating sound at all in the ordinary sense of the word. 

 The vibrations caused by the fluttering of another individual 

 are, however, detected instantly. 



Dr. Eltringham said that he thought that hearing in insects, 

 like scent, is probably selective. 



HOMOEOSIS IN COENONYMPHA PAMPHILUS.— Dr. E. A. 



Cockayne exhibited a ? of C. pam/philus L., in which a large 

 area on the underside of the right hind-wing has the colour, 

 pattern and scaling of the homologous area of the underside 

 of the right fore-wing. The wing is a little smaller than the 

 other, but the shape and neuration are normal. It is the 

 fifth example recorded in this species, and it v/as taken by 

 Mr. F. J. CouLSON at Walton Heath on July 3, 1922. 



An intersex op Mydaea duplicata. — Mr. J. E. Collin 

 exhibited an " intersex " of Mydaea duplicata Mg. (Diptera), 

 captured by Prof. J. W. Carr in Sherwood Forest on July 

 6, 1919, apparently exactly similar to the two specimens 

 described by Schnabl (W.E.Z. 1890, pp. 177-181). This 

 " intersex " was described as a new species by Zetterstedt in 

 1860 under the name oi Anthomyza flavogrisea. Prof. Carr's 

 specimen makes the fourth known example. The exhibitor 

 called attention to the work that had been done recently in 

 America by Sturtevant and others in the production of inter- 

 sexes in breeding experiments with Dwsophila melanoyaster and 

 D. simulans. 



Living larvae op a Nemopterid from the Egyptian 

 DESERT. — Prof. Poulton exhibited, on behalf of Mr. E. N. 

 Willmer, three living Nemopterid larvae and an imago taken 

 in the Wadi Digla, near Cairo, in September, 1922. The latter, 

 which might not be the same species as the larvae, v/as identi- 

 fied by Mr. H. Campion as probably Klugina aristata Klug. 

 The larvae, kept with some of the blown desert dust in a glass- 

 topped pill-box, and for exhibition in a glass tube, seemed to 

 be quite healthy after many weeks without food. Quite 

 recently insect food had been offered to them, but it was 



