iQoS] ' Proceedings of the Society 29 



Discussion by Dr. Headlee and Dr. Fletcher. 



Is Mutation a factor in the production of Vestigial Wings among 

 Insects? (A summary of some observations among insects be- 

 longing to various groups, where the evolution of wingless or 

 subapterous species can be traced within a group). C. T. Brues. 

 (To be published in Jour. N. Y. Ent. Soc.) 



Mr. Hinds asked if Mr. Brues had paid attention to the winged 

 condition in Thysanoptera. There one finds dimorphism due to 

 season. There is no relation between the short winged and entire- 

 ly apterous forms, but the same species will show short and long 

 winged individuals. The paper was further discussed by Messrs. 

 Smith, Bruner and Cook. 



The meeting then adjourned until i -.30. 



The afternoon session was opened .by the reading of a paper 

 by Dr. W. A. Riley, entitled. External Wing Buds in the Larva of 

 Holometabolous Insects. (A brief discussion of the general subject 

 and recorded insects, and a report of an unrecorded instance.) 

 (Published Entomological News, March, 1908.) 



Dr. Needham said that he had never found any trace of exter- 

 nal wings in the Larva of Diptera of Neuroptera that he had 

 examined. 



Notes on the Nervotts System of the Cordyalis larva. A. G. 

 Hammar. 



Dr. Riley remarked that such work showed the need for care- 

 ful studies of the nervous system of insects. He suggested that 

 by tracing out the proper nerve Mr. Hammar might be able to 

 locate the salivary gland, which no one had yet succeeded in 

 doing. Dr. Smith asked Mr. Hammar for his technique. Fresh 

 material was used hardened in Gilson's fiuid and stained in picric 

 acid. The incision is made on the dorsal side, and the dissection 

 made under w^ater, the larva being pinned to cork. 



In the absence of the author, a paper by Dr. A. Petrunkevitch 

 entitled, ''The Sense of Sight in Spiders, " was read by title only. 

 (To be published in Journal Exp. Zool.) 



Dr. Riley moved that nominations for President and First 

 and Second Vice President, Secretary-Treasurer and the six addi- 

 tional members of the Executive Committee be by ballot, to be 

 signed and handed in to the Secretary before 11 a. m., Tuesday, 

 and that from the names so placed in nomination, the four leading 

 each list be finally balloted upon, except that in the case of the 

 Executive Committee, the first twelve be considered. 



