16 BULLETIN 427, U. S. DEPARTMENT OF AGRICULTURE. 
takes place at all hours of the day. Daylight oviposition out of 
doors occurs only on cold and dark days. A single moth under labor- 
atory conditions will deposit 150 to 250 eggs with the extremes of 38 
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Fig. 13.— The potato tuber moth as a leaf-miner on tomato. An uncommon form of injury. (Original. ) 
for the minimum and 290 for the maximum; oviposition is completed 
in from 6 to 1 7 days, and by far the greater number of eggs is usually 
deposited in about 4 days. 
