Oct. 2-Dec. 26,1916 
Illustrations 
xv 
Page 
Fig. 9. Time required at different temperatures to drive off half and all the 
water from sand containing 20 per cent moisture.. 453 
10. Evaporation of water in 66 days from sand of different sizes with a 
water table maintained 1 cm. below the surface. 454 
xi. Evaporation of water in 36 days from loam and sand of different sizes 
with a water table maintained 3 cm. below the surface. 454 
12. Evaporation of water in 115 days from quartz and river sand of different 
sizes with a water table maintained 3 cm. below the surface. 455 
13. Toss of water from glasses having dry mulches of sand of various sizes 
suspended above free water. 455 
14. Loss of water in 180 days from glasses having dry mulches of various 
kinds suspended above free water. 456 
15. Evaporation from distilled water and from sodium-chlorid solutions 
of different concentrations. 457 
16. Evaporation from sand wet with distilled water and with sodium- 
nitrate solutions of different concentrations. 458 
17. Evaporation of water from Greenville loam containing different 
quantities of sodium chlorid. 459 
MACROSIPHUM GRANARIUM, THE) ENGLISH GRAIN APHIS 
FlG. i. Map showing the distribution of Macrosiphum granarium in the United 
States as indicated by records on file in the Bureau of Entomology, 
1916. 465 
Syntomaspis druparum, the) Apple-Seed Chalcid 
Fig. i. Syntomaspis druparum: Apple and seed showing oviposition puncture. 493 
2. Syntomaspis druparum: Eggs. 494 
3. Syntomaspis druparum: Newly hatched larva. 494 
4. Syntomaspis druparum: Mouth parts of larva of first instar. 494 
5. Syntomaspis druparum: Mandibles of larvae of various instars_ 495 
6. Syntomaspis druparum: Full-grown larva. 495 
7. Syntomaspis druparum: Mouth parts of full-grown larva. 496 
8. Syntomaspis druparum: Pupa of female.'. 500 
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