leaner du 16 Février 1!)2I 20 



area becoming enlarged is thereby considerably les- 

 sened and the removal of the more susceptible trees 

 will almost certainly ultimately lead to the control 

 of the pest. 



Séance du 16 Février 1921 



Présidence de M. Joseph Jullien 



Communication 



Note on the acquatic caterpillar 



of Nymphula Sp. (Microlepid.) 



By H. C. Efflatoun, Lecturer in Biology, 

 School of Médecine, Cairo. 



Professor E. Hindle directed my attention on a 

 lepidopterous larva, which he had found last summer 

 in the sweet-v/ater canal at Suez. They were found 

 amongst the leaves of Najas marina on which they 

 very likely fed. He collected and brought back 

 with him to the School of Médecine a few of iheso 

 larvae as well as the water plant, but unfortunately 



