176 PROCEEDINGS OF THE ACADEMY OF [March, 



March 2. 

 Arthur Erwin Brown, Sc.D., Vice-President, in the Chair. 



Thirty-one persons present. 



The Publication Committee reported the reception of papers for 

 publication under the following titles: 



"Arachnida from Costa Rica." By Nathan Banks (February 19). 

 "Microscopical Image Formation." By F. J. Keeley (March 2). 



Dr. John MacFarlane made a communication on irrito-contrac- 

 tility in plants. (No abstract.) 



March 16. 

 Arthur Erwin Brown, Sc.D., Vice-President, in the Chair. 



Twenty-five persons present. 



The death of Prof. Percival de Loriol le Fort, a Correspondent, on 

 December 23, 1908, was announced. 



Dr. Henry Skinner made a communication on Antigeny or Sexual 

 Diversity in Insects. (No abstract.) 



Corrections : Dr. G. C. Crampton regrets that the following errors escaped 

 him while reading the proofs of his paper entitled "A Contribution to the 

 Comparative Morphology of the Thoracic Sclerites of Insects" : 



In Figures 6, 7 and 8, the region labelled S x should be designated S 2 . 



In the explanation of Figure 12, instead of " sternellum," read " scut.ellum." 



Page 35, line 29, instead of "katepimeral complex," read "katepisternal 

 complex." 



Page 29, line 11, instead of Corydali*, read Chrysopa. 



The insect figured in Plate I is not Nernura, but Leuctra. 



William Welsh was elected a member. 

 The following was ordered to be printed : 



