Vol. xxiii] ENTOMOLOGICAL NEWS. 385 



Dr. Skinner remarked that much depended on the method 

 and the possibility of agreement on a way of carrying out 

 nomina conscrvanda. 



Dr. Calvert said that specialists in various groups could 

 send in lists of nomina conservanda to be accepted or decided 

 on by some central or authoritative committee. 



Mr. E. T. Cresson, Jr., spoke of the changes made in cer- 

 tain families of Diptera in a paper by Meigen. 



Mr. Hornig exhibited a scale insect on "Asparagus Fern" 

 and said his plants were all infested with it. He asked about 

 the methods of distribution of the species. Discussed by the 

 members. 



Mr. Laurent exhibited a peculiar color form of a female 

 Callosamia promethea raised from a cocoon. 



HENRY SKINNER, Recorder. 



Meeting of May 23rd, 1912, Mr. Laurent, Director, presid- 

 ing. Six persons were present. 



Dr. Calvert spoke in relation to his work on the Odonata 

 and the results attained by Dr. Walker in his latelv published 

 monograph of the North American dragonflies of the genus 

 Acshna. Dr. Walker had found that it required about three 

 vears for the larvae of this genus to become full grown, and 

 that this growth was accomplished in about twelve moults. He 

 further complimented Dr. Walker on his work and mentioned 

 its general scope and thoroughness in biological detail. Dis- 

 cussed by the members. 



Mr. E. T. Cresson, Jr., made some remarks on damage done 

 to a floor of hard wood by Lyctus striatns fColeop.) 



Mr. Laurent exhibited a specimen of Cicindcla modcsta 

 taken at Tona, New Jersey, May I7th, and remarked upon its 

 abnormal marking. 



Mr. Liebeck said he had received from E. E. Calder speci- 

 mens of the green and brown forms of Cicindcla rugifrnns 

 and modesta, which were said to have been caught in copula- 

 tion. 



It was announced that Mr. C. T. Greene, an Associate of 



