96 



had done this, and had supplied them with a very good key to the 

 genus Diaschiza. Hudson and Gosse left the description of this 

 genus in a very incomplete state, and though their work was of 

 great value, it was by no means to be considered as final. He- 

 would strongly urge young students of the Rotifera to concentrate 

 their attention upon one genus, as he felt sure that much more 

 good would be done by this than by any amount of indiscriminate 

 pond hunting. 



The thanks of the Club were voted to the authors of these 

 communications. 



Mr. D. J. Scourfield read a paper by Mr. Kirkaldy, " On the 

 Stridulating Organs of Water-bugs." 



Mr. R. T. Lewis said he understood the writer of this paper to 

 say that this was the only instance in which a genus was deter- 

 mined by reference to the stridulating organs. He thought^ 

 however, that there were some other examples in which these had 

 been regarded as generic characters : the Pneumoridae for instance,^ 

 were distinguished from other Orthoptera by the peculiar position 

 of their organs of stridulation on the sides of the abdomen, with 

 the counterpart on the femora of the third pair of legs. 



Mr. Scourfield said that he did not think Mr. Kirkaldy wished 

 it to be understood that the cases referred to in the paper 

 were the first in which stridulating organs had been utilised for 

 systematic purposes among insects generally, but simply that this 

 was the first occasion upon which they had been so used in the 

 group of the Rhynchota or Water-bugs. 



The thanks of the Club were voted to the author of this paper 

 and to Mr. Scourfield for reading it to the meeting. 



Mr. D. J. Scourfield also read a paper on the Ephippium of 

 Bosmina. 



Mr. Karop asked if these ephippia and winter eggs were laid 

 in the ordinary way, or if they were simply set free by the 

 decomposition of the mother. 



Mr. Scourfield said they were thrown off when the animals 

 moulted, the mother surviving. 



Mr. Soar read a paper on a new species of Water-mite, 

 Pionacercus pyriformisy drawings of which were made upon the 

 board in illustration. 



The thanks of the Club were unanimously voted to Mr. 

 Scourfield and Mr. Soar for their very interesting papers. 



