xn 
Journal of Agricultural Research 
Vol. VII 
Syntomaspis druparum, the Apple-seed Chalcid 
Page 
PLATE 37. Syntomaspis druparum: A.—Adult female. B.—Adult male; outline 
of abdomen, lateral view, at right. 502 
Plate 38. Syntomaspis druparum: Apple injury and hibernating larvse. A.— 
Usual type of injury resulting from oviposition. B, C.—Extreme type of 
injury resulting from oviposition. D.—Hibernating larvae within seeds of 
an apple.. 502 
Plate 39. Syntomaspis druparum: Infested and sound seeds of apples. A.— 
Infested seeds. B.—Sound seeds. 502 
Plate 40. Syntomaspis druparum: Oviposition. A.—Female ovipositing in 
fruit of Crataegus sp. B, C.—Oviposition in apples. D.—Mica cage used 
in the life-history studies of Syntomaspis druparum . 502 
TEXT FIGURES 
Acidity and Absorption in Soils as Measured by the Hydrogen Elec¬ 
trode 
Fig. 1. Diagram of the hydrogen-electrode apparatus and of the apparatus for 
generating pure hydrogen. 140 
Life History of Habrocytus medicaginis, a Recently Described Para¬ 
site of the Chalcis Fly in Alfalfa Seed 
Fig. 1. Map of the United States, showing the known distribution of Habro¬ 
cytus medicaginis . 148 
Daily Transpiration During the Normal Growth Period and its Cor¬ 
relation with the Weather 
Fig. 1. Graphs showing the daily transpiration from the individual pots of 
plants which constituted the first five sets in the transpiration meas¬ 
urements in 1914. . . .. 157 
2. Graphs showing the daily intensity of environmental factors and the 
daily transpiration of 22 crops for the year 1914... 164 
3. Graphs showing the daily intensity of environmental factors and the 
daily transpiration of 23 crops for the year 1915. 174 
4. Determination of the area, 01a a plane normal to the sun’s rays, of the 
shadow of a cylinder of diameter and height in terms of the angular 
departure of the sun from the vertical.„ 186 • 
5. Ratios of the daily transpiration of Kubanka wheat to the daily inten¬ 
sity of various weather factors, plotted with approximately the same 
amplitude. 188 
6. Ratios of the daily transpiration of Minnesota Amber sorghum to the 
daily intensity of various weather factors, plotted with approximately 
the same amplitude. 188 
7. Ratios of the daily transpiration of alfalfa to the daily intensity of 
various weather factors, plotted with approximately the same 
amplitude. 190 
8. The ratio of daily transpiration of different crops in 1914 to daily evap¬ 
oration (shallow tank) plotted in percentage of the maximum . 191 
9. The ratio of daily transpiration of different crops grown in 1915 to daily 
• evaporation (shallow tank) plotted in percentage of the maximum.. 192 
10. Graph showing a linear relation between the logarithm of the transpira¬ 
tion-evaporation ratio of Sudan grass and the time... 196 
