THE HAWAIIAN BEET WEBWOEM. 
Temperatures at Honolulu during the time the species teas reared. 
Month. 
Minimum 
tempera- 
ture. 
Maximum 
tempera- 
ture. 
Average 
mean tem- 
perature 
for entire 
month. 
1910. 
July 
°F. 
69 
66 
69 
65 
66 
62 
58 
°F. 
84 
85 
85 
84 
84 
80 
79 
°F. 
76.5 
76.8 
77.0 
75.3 
74.6 
71.2 
70.0 
September 
November 
| December 
1911. 
j January 
NATURAL ENEMIES. 
At various dates larva? were collected in the field and confined in 
cages in the insectary. In this way three species of hymenopterous 
parasites were obtained. These were Limnerium hawaiiense Cram., 
Chelonus blackbumi Cram., and Cremastus hymenice Vier. 
L. hawaiiense was obtained in greatest numbers during August and 
September, while C. blackbumi apparently became more abundant 
during December. C. hymenice was 'reared only in small numbers 
and at all times appeared to be more rare than the other species. Xo 
predaceous enemies were actually .observed feeding on the Hymenia 
larvae or pupae, but on several occasions a species of wasp (Polistes 
hebrwus Fab.) was seen buzzing about infested plants. During the 
warmer months this wasp and allied species are efficient enemies of 
the common cabbage worm (Pontia rapce L.), and it is not improb- 
able that they also occasionally kill Hymenia larvae. On the whole, 
the natural enemies apparently do not reduce the number of Hymenia 
larvae sufficiently to be of much practical value. 
EXPERIMENTS WITH INSECTICIDES. 
During the fall of 1910. an opportunity was taken to make some 
experiments against the Hymenia larvae with insecticides. The ex- 
periments were as follows: 
Experiment No. 1. — Paris green, 4 pounds, and lime, 4 pounds, in 
100 gallons of water. September 1, three beds of table beets, each 
10 yards in length and 1 yard wide, were sprayed with about 2 gal- 
lons of this mixture. The application was made with a portable, 
compressed-air sprayer, which was fitted with a short extension-rod 
elbow and a Vermorel type nozzle. The mixture was applied chiefly 
to the upper surface of the leaves and it adhered very well. The 
weather at the time of the application was hot and clear and without 
a breeze. 
The following day all the larvae were alive, except those on ac- 
casional. leaves which were poisoned on the underside. Thirty-three 
