8 
Mr. Koebele returned from Australia in March and came on to Wash- 
ington for special work, returning to Alameda, Cal., April 15. He 
spent considerable time in writing out his report on his Australian 
work (published in Bulletin No. 21 of this Division) and in assisting to 
rear and distribute the Vedalia. 
During the latter part of the season he did considerable field work 
and reports upon a number of injurious species. Perhaps the most in- 
teresting feature in his report is his work upon the enemies of the Cod- 
ling Moth in California. He has reared four entirely new parasites of 
this species, two of which are primary and two secondary. The egg 
parasite seems to be a very important feature in the life of the Codling 
Moth on the Pacific coast, and we know from previous experience with 
egg-parasites of the same genus that they are capable of very rapid 
development and are consequently very beneficial insects where they 
attack injurious species. We need only refer to the case mentioned in 
the Fourth Report of the U. S. Entomological Commission, where 
by the work of Trichogramma pretiosa Riley, the fifth brood of Cotton 
Worm was almost completely annihilated in Florida, where at the be- 
ginning of the fourth brood less than one-half of the eggs had been de- 
stroyed. By almost complete annihilation we mean that less than 10 
per cent. of the Cotton Worm eggs throughout a large section remained 
unstung. | 7 
Professor Bruner treats of the insects of the year and enters upon 
the consideration of insects detrimental to the growth of young trees on 
tree claims in Nebraska and other portions of the West, an important 
subject which has not before received treatment. 
C. V. R. 
