4 BULLETIN 1142, U. S. DEPARTMENT OF AGRICULTURE. 
Experiment A. 
(Day dull and rather cool.) 
ELEMENTS. 
Caterpillar. 
Fourth stage; not very far advanced, rather small for the stage. 
Bands (horizontal). 10 
1. Flour paste band made of wheat flour and water, about tV inch high, 1£ 
inches wide, 5| inches long. 2. Solid band made of flour. and water (hardened), 
& inch high, If inches wide, 6 inches long, sides practically vertical. 3. Solid band 
made of flour and coal-tar neutral oil (at rate of If ounces flour and f + ounce 
oil), £ inch high, 1£ inches wide, 51 inches long. 4. Solid band made of flour 
and coal-tar neutral oil (at rate of 2 ounces flour and 1+ ounce oil), & inch 
high, lie inches wide, 4£ inches long, sides vertical. 5. Solid band made of 
flour and coal-tar neutral oil (at rate of 2 ounces flour and 1^ ounces oil), 
about i inch high, life inches wide, and 5| inches long, sides vertical. 
All on sheets of white paper. 
TESTS. 
Band 1 : 9.25 a. m. 
The caterpillar was placed five distinct times on the sheet of paper 6 inches 
from and facing the band, and during about one-half hour made 16 attempts to 
cross the band, but backed out or turned away each time it came more or less 
in contact with the band. 
Band 2: 9.55 a. m. 
The caterpillar was placed twice G inches from the band, and crossed each 
time without very much hesitation. 
Band 3, with marked coal-tar neutral oil odor, somewhat damp to touch: 
10.25 a. m. 
The caterpillar was placed 6 inches from and facing the band. It approached 
within 2 inches of the band, then turned at an angle and went around the end of 
the band. 
The caterpillar was placed again in the same position. It stopped short and 
turned somewhat at an angle when about 2 inches from the band but soon 
resumed a straight course, swung upon the band on reaching it, and crawled 
across. 
The caterpillar was placed a third time. It stopped short and turned away 
from the band when within about £ inch of it and after crawling along it for 
a short distance, about i inch away from it, it veered abruptly and crawled 
away. 
Placed a fourth time, the caterpillar stopped and swung its head three times 
when about i inch from the band, then continued, and on reaching the band 
(at a slight angle) it swung upon it with the first pair of legs, but after linger- 
ing on the band 2 or 3 seconds it swung off and crawled away. 
Band 4, tvith marked odor, somewhat damp to touch : 11 a. m. 
The caterpillar was placed 6 inches from and facing the band. It paused when 
about 4£ inches away and again at a distance of about \ inch and swung its 
head two or three times ; stretched forward when about I inch away and ap- 
parently came in contact w'th the band ; then turned and crawled away. 
The caterpillar was placed again. It paused when about 2J inches away 
and again at about i inch, then stretched toward the band and after some 
hesitation swung upon it (with the first pair of legs) and hesitatingly crawled 
up and across. 
When placed a third time, the caterpillar got to within about £ inch of the 
band, swung its head several times, turned and crawled away. 
Placed for the fourth time, the caterpillar approached within about is inch 
of the band and turned away, but soon swung back, and after getting upon 
the band with the first pair of legs, swung down and crawled away. 
Being placed for the fifth fine, the caterp'llar stopped about J inch from 
the band and swung its head two or three t^mes. then resumed, and on reach- 
ing the band presently at a slight angle, it swung on with the first pair of legs, 
10 The gipsy moth tree-banding material band used on trees in the control work against 
the gipsy moth is if inch wide and 3 7 z inch thick, and is rectangular in form {2, p. 10). 
