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JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 9 



males and one male at the Laboratory trap light. Adults were collected 

 throughout August, September and October by other members of the 

 staff at the same light. 



In 1915 the adults first appeared in mid- April. On March 30, 

 H. L. Parker collected a puparium in the field, from which an adult 

 emerged in the Laboratory April 9. On April 17 he collected a pupa- 

 rium from which the adult had but recently emerged, and on the 27th 

 an adult was taken at the trap light and a pair swept in an alfalfa field. 

 Adults were taken throughout May, June, July and August of 1915, so, 

 with the 1914 data, it is evident that they are present in the field from 

 mid-April to early November. 



Table No. I 



* Escaped. 



Numbers 1 to 7 were kept under practically normal field conditions, 

 as to temperature, in a cold cellar. Numbers 8 to 13 inclusive were 

 kept in the same cellar until the middle of November when they were 

 removed to a heated room for the experiments which followed. All host 

 larvae used in these experiments, after obtaining the original parasite 

 from a larva collected in the field, were reared from eggs laid in the 

 Laboratory by moths which were themselves reared and mated in 

 confinement. The host larvte on hatching were isolated in the salve 

 box cages and given accession numbers. It was found advantageous 

 to place a piece of moist blotting paper in each box for the first two 

 instars as dessication rapidly destroyed the very young larvae. By 

 this method of procedure the exact age of every host larva exposed to 

 a parasite was known and the possiblity of previous infestation by 

 parasites precluded. 



