10 
BULLETIN" 273, U. S. DEPARTMENT OF AGRICULTURE. 
The first larva was caught May 9 and the last June 5, although 
examinations of later date were made. These dates indicate the 
range of the wind dispersion period for that section in 1913. The 
distance borne by the wind was 1 mile or more. 
Another small experiment was conducted 200 feet from the above 
screen by attaching to the northwest, west, and southwest sides of a 
small stable 77 square feet of cotton cloth which was smeared with 
tanglefoot. This experiment was not started at the beginning of 
the season, but 9 larvse were blown into the tanglefooted cloth be- 
tween May 20 and 31. The object in this experiment was to ascer- 
tain the comparative efficiency of tanglefooted wire screen and a solid 
tanglefooted surface as traps. 
CONTINUATION OF SCREEN EXPERIMENT AT SALISBURY BEACH, MASS., 
IN 1914. 
The same screen (PI. Ill, fig. 1) as was erected in 1913 was cleaned 
and retanglefooted for the dispersion season of 1914. The infesta- 
tion in the woodlands to the westward, owing to the increase of 
Calosoma sijcoplianta L., Compsilura concinnata Meig., and the wilt 
disease, was less intense during the latter year. The dispersion 
period was much later and consequently much shorter than in 1913. 
Examinations were begun about the time the hatching of eggs was 
first noted in the field. The first caterpillar was caught May 19 and 
the last May 31 in this location. 
The weather records were taken 1 mile south for this point at Plum 
Island, Mass. (PL II), by Mr. C E. Hood, and were compared with 
those of the United States Weather Bureau at Boston, Mass., from 
which they differed very little. 
Table III. — Dates and numbers of newly hatched caterpillars caught on screen, with tem- 
perature, direction of wind, and velocity of wind, at Salisbury Beach, Mass., in 1914- 
Date and time removed. 
Number 
of cater- 
pillars 
caught. 
Maxi- 
mum 
tempera- 
ture. 
Mini- 
mum 
tempera- 
ture. 
Average between 8 a. m. and 
5 p. m. 
Prevailing wind 
direction. 
Wind veloc- 
ity, in miles 
per hour. 
May 19, a. m 
May 20, a. m 
May 21, a. m. and p. m 
May 22, a. m 
May 23, a. m. and p. m 
May 24, a. m. and p. m 
May 25, a. m 
May 26, a. m 
May 27, a. m 
May 28, a. m 
May 29, a. m. and p. m 
May 39, a. m 
May 31, a. m. and p. m 
Total 
°F. 
W. and NW 
W. and NW. 
NE. to SE.. 
E.andSE.. 
W 
W 
sw 
SW. and W. 
W. toS 
NW 
E. andSE .. 
SW 
w 
8 to 12 
2 to 6 
7 to 11 
2 to 10 
10 to 23 
11 to 16 
12 to 21 
7 to 20 
4 to 12 
11 to 20 
9 to 17 
7 to 9 
7 to 14 
