311 
REPORT OF ASSISTANT ENTOMOLOGIST. 
Honolulu, Hawaii, August 31, 1910. 
]\lr. E. M. Elirhorn, Honolulu, T. H. 
Sir : — On receipt of your cablegram announcing my appoint- 
ment as Assistant Entomologist to the Territorial Board of Agri- 
culture and Eorestry I resigned from the United States Depart- 
ment of Agriculture, Bureau of Entomology, and proceeded to 
Hawaii. I reached Honolulu July 18, 1910, and commenced 
work at once. 
During the past few years I have been working almost exclu- 
sively on insects which affect sugar-beets and garden vegetables 
and after looking about a little I concluded that a study of truck 
crop insects offered excellent opportunities in these islands. 
Accordingly, during the six weeks that I have been employed 
by the Board, I have devoted my time to a special study of the 
melon fly (Dacns ciicnrbitae) and the Japanese beetle {A dor etas 
fcnuiinaculafus) . Careful life history studies have been com- 
menced with both of these species and a rather extensive series 
of field experiments have been undertaken. 
The experiments with the melon fly have thus far been con- 
fined to the use of poisoned baits, but the tests have not been 
continued long enough to permit definite conclusions to be drawn. 
Eurther experiments will be made against this pest with repellents 
and possibly also with trap crops as soon as time and equipment 
will allow. 
Several experiments have been made against the Japanese 
beetle by spraying with arsenicals. Thus far arsenate of lead has 
not proved effective, but fairly satisfactory results have been 
obtained with Paris green. 
The melon fly and Japanese beetle are exceedingly difficult 
species to successfully combat. A more complete knowledge of 
their life history is necessary and it is probable that one or two 
years of patient study wilBbe required before effective control 
measures can be devised. 
In addition to the two species already mentioned I am also 
making a study of the life history of Hymcnia fascialis, Pontia 
rapac, Hollula undalis and other insects, destructive to the cab- 
bage and beet. These insects once under control will cause the 
now discouraged grower to again try his luck in cabbage growing. 
Another species which I have given considerable study is 
Macrosiphiim sanborni, a reddish plant louse, which at times, is 
a serious pest on chrysanthemums. I made a series of nine spray- 
ing experiments with an oil emulsion, whale-oil soap and two 
nicotine preparations against this louse. One of the nicotine prep- 
arations known as “Black Leaf 40” proved an effective and cheap 
