1915] Proceedings California Summer Meeting 385 
Professor A. J. Cook, State Horticultural Commissioner of 
California, extended an invitation to the members to visit the 
State Insectary, located at Sacramento and the Quarantine 
Station in San Francisco. The Society then adjourned, to 
meet on Tuesday at 10:00 A. M., at the same place. 
The third session was called to order by the Temporary 
Chairman and the regular program resumed. 
E. D. Ball, Utah Agricultural College—Some Special 
Adaptations to Arid Conditions Exhibited by Cercopide and 
Membracide. 
This paper was discussed by the Temporary Chairman, 
Processor: Hie -F.. Walson: Mir: Ea P. Van Duzee. Mr. He -G: 
Champion and Dr. E. C. Van Dyke. 
H. F. Wilson, Oregon Agricultural College—The Tribe 
Pterocomini, Family Aphidide. Read by title: with the 
addition of a few remarks. 
J. Dewitz, Metz, Germany—Ueber die Gifte Pflanzenlause. 
A translation of Dr. Dewitz’s paper was presented by 
Professor W. M. Wheeler of Harvard University, under the 
title: “‘On the Poisons of Plant-Lice.’’ The reading of this 
paper was followed by a general discussion of the paper and of 
plant-lice in general by Professor H. F. Wilson, Mr. Leroy 
Childs, Professor A. L. Melander, Mr. Swezey, Mr..E. H. 
Ehrhorn, and Mr. G. A. Coleman. 
M. A. Yothers, State College of Washington—The Physiolog- 
ical Effects of Endoparasitism upon the Host Insect. Read by 
title. 
M. A. Yothers, State College of Washington—Some New 
Insects of Importance in the Northwest. Read by title. 
The Society then adjourned to meet on Wednesday, August 
Ath, at 2:00 P. M., at the Leland Stanford Junior University. 
The fourth session, preceded by a cafeteria lunch, served 
on the Campus, was called to order by the Temporary Chair- 
man, at 2:00 P. M., at the Leland Stanford Junior University 
and the following paper was presented: 
Isabel McCracken, Leland Stanford Junior University— 
Notes on California Cynipide with Particular Reference to 
the Species Diplolepis ambrosa Full. 
