60 THE FLORIDA BUGGIST 
The paper of the evening, ‘‘Insect Photography,’ was read 
by Dr. H. S. Davis and discussed by those present. Dr. Davis 
explained the use of colored screens interposed before the object 
to be photographed. The purpose of these screens is twofold: 
(1) to intensify certain colors and to subdue others, in order to 
bring out their relative values as they appear to the eye; (2) 
to eliminate certain colors altogether. This is necessary be- 
cause photographic plates are not equally sensitive to all col- 
ors. A yellowish or light brown color, for instance, will ordi- 
narily photograph black, but by interposing a screen of that 
color, and giving a longer exposure, its proper value will be 
given in the photograph. However, to use screens successfully, 
plates sensitive to several colors, or all colors, are necessary, 
such as Ortho, Iso, and others. The use of the new Pan-chro- 
matic plates, sensitive to all colors, was explained and illustrated 
by a diagram of the spectrum. That the slower plates give bet- 
ter results for photographing specimens in the laboratory than 
the very rapid ones so generally used, was also emphasized. 
March 25. It was voted to increase the annual dues of the 
Society from 50 cents to $1.00, beginning with 1918. .Of all 
members who voted, non-resident as well as resident, only one 
non-resident member voted against the increase. 
Under “Timely Notes’ Mr. Frank Stirling reported on the 
rearing of 20 Tachina Flies from the caterpillar of a tiger 
moth collected at Gainesville. He also reported collecting the 
grubs and adults of a 11-lined beetle (Leptinotarsa undecim- 
lineata) feeding on wild eggplant at Havana, Cuba, in January, 
1918. This beetle is a close relative of the Colorado Potato 
Beetle (Leptinotarsa decimlineata), so common in the north and 
also occurring in the northern tier of counties of Florida. 
Messrs. Dozier and Van Hyning reported obtaining some nema- 
tode worms from katydids. 
The paper of the evening, “Ecology of Hammock Insects,” 
was read by Mr. Dozier. The discussion was led by Prof. Wat- 
son, followed by others present. 
The Society adjourned at 6 p. m. 
April 29. Visitors present were Prof. C. L. Willoughby of the 
University and Mr. Leland of the University Farm. 
