CAMBRIDGE ENTOMOLOGICAL CLUB. 

 OFFICERS FOR 1920. 



President C. A. Frost. 



Vice-President W. L. W. Field. 



Secretary . J. C. Emerton. 



Treasurer F. H. Walker. 



Executive Committee 



S. W. Denton, L. W. Swett, P. G. Bolster. 



EDITORIAL BOARD OF PSYCHE. 

 EDITOR-IN-CHIEF. 



C. T. Brues, Harvard University. 



ASSOCIATE EDITORS. 



C. W. Johnson, V. L. Kellogg, 



Boston Society of Natural History. Stanford University. 



A. L. Melander, a. p. Morse, 



Washington State College. Wellesley College. 



J. H. Emerton, J. G. Needham, 



Boston, Mass. Cornell University. 



W. M. Wheeler, 

 Harvard University. 



Psyche is published bi-monthly, the issues appearing in February, April, June, August , 

 October and December. Subscription price, per year, payable in advance: $2.00 to subscribers 

 in the United States, Canada or Mexico; foreign postage 15 cents extra. Single copies, 40 cents. 



Cheques and remittances should be addressed to Treasurer, Cambridge Entomological Club, 

 Bussey Institution, Forest Hills, Boston 30, Mass. 



Orders for back volumes, missing numbers, notices of change of address, etc., should be sent 

 to Cambridge Entomological Club, Bussey Institution, Forest Hills, Boston 30, Mass. 



IMPORTANT NOTICE TO CONTRIBUTORS. 



Manuscripts intended for publication, books intended for review, and other editorial matter 

 should be addressed to Professor C. T. Brues, Bussey Institution, Forest Hills, Boston 30, Mass. 



Authors contributing articles over 8 printed pages in length will be required to bear a part 

 of the extra expense for additional pages. This expense will be that of typesetting only, which 

 is about $1.20 per page. The actual cost of preparing cuts for all illustrations must be borne 

 by contributors: the expense for full page plates from line drawings is approximately $3.60 

 each, and for full page half-tones .$4.80 each, smaller sizes in proportion. 



AUTHOR'S SEPARATES. 



Reprints of articles may be secured by authors at the following rates: 



Length 



of Article. 



1 to 4 pages 



5 to 8 pages 



9 to 12 pages 



13 to 16 pages 



17 to 32 pages 



Offprints, if occurring in one signature, per 100, $2.50; if in two signatures, $4.50. 



Entered as second-class mail matter at the Post Office at Boston, Mass. Acceptance 

 for mailing at special rate of postage provided for in section 1103, Act of October 3, 1917, 

 authorized on June 29, 1918. 



