( iv ) 



would be open, and, except for the presence of these " trap-doors," it would 

 be easy for any acarideous parasite to establish itself in the entrances of the 

 tracheae. 



The Secretary exhibited, on behalf of Mr. G. S. Saunders, a microscopic 

 instrument which greatly facilitated the examination of pinned or living 

 specimens under the microscope without alteration of the stage. The 

 instrument, which was made by Messrs. Baker & Sons, 243, High Holborn, 

 consists of a double plate of ebonite in which is fixed a brass ball which is 

 made to rotate by working a handle fixed at the side of the plate ; the ball 

 is hollow, and can be either filled with cork for pinned specimens, fitted as 

 a small " live box," or made to hold a small pair of forceps. 



Paper read. 

 Mr. J. B. Bridgman communicated a paper entitled " Further Additions 

 to Mr. Marshall's Catalogue of British Ichneumonidse," in which sixteen 

 species were referred to as new to Britain, and twenty-six species described 

 as new to science. 



New Part of ' Transactions.' 

 Part I. of the 'Transactions' for 1883 was on the table. 



April 4, 1883. 

 J. W. Dunning, Esq., M.A., F.L.S., &c, President, in the chair. 



Donations to the Library were announced, and thanks voted to the 

 respective donors. 



The President announced the sudden death, ou March 27th last, of 

 Prof. P. C. Zeller, of Stettin, who had been an Honorary Member of this 

 Society for upwards of thirty years, suitably alluding to his life and works 

 in some extended remarks. Messrs. Stainton, M'Lacblan, and Westwood 

 also communicated some reminiscences of our late colleague. 



Election of Members. 

 Lewis F. Hill, Esq. (3, Edwardes Terrace, Kensington), and Louis 

 Peringuey, Esq. (Rondebosch, Cape Town), were balloted for and elected 

 Members of the Society. 



Exhibitions, dc. 



Mr. W. F. Kirby exhibited specimens of Acridium succinctum, Linn., 

 received from Mr. T. Davidson, who stated that it was this species of locust 

 which had lately been causing great destruction in the Deccan and other 

 parts of India. 



Prof. Westwood called attention to a communication to a Sussex news- 

 paper by a gardener named Page, stating that he had found a new cause of 



