Journal of Agricultural Research 
Vol. XXI, No. 3 
130 
maximum flight thousands of adults may be seen on the wing and crawl¬ 
ing over the foliage of the host and other trees. Many of them fall into 
the streams and on the numerous small lakes and perish; thousands may 
be seen floating on the surface of the water. During this period the 
flying moths become a pest to campers in the locality, as they invade 
the tents and fall into the cooking utensils and provisions. 
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Fig. i.—D iagram illustrating the life history of Recurvarta ntilleri at Lake Tenaya, Yosemite National 
Park, Calif. 
The eggs are deposited on and under the needle sheaths at the base of 
the needles. Occasionally eggs are found on the terminal shoots near 
the base of the needles. Larvae begin to hatch about August 5 and 
continue hatching until about September 10. Attack by the young 
larvae on the tender needles of the current year's growth begins soon 
after hatching. The young larvae invariably attack the new needles by 
boring in near the outer ends, and they always work toward the petiole, 
never in the opposite direction. This peculiarity of habit permits of a 
