12 BULLETIN 1142, U. S. DEPARTMENT OF AGRICULTURE. 
on the side of the band and off, slowly, landing again at the foot of the bridge, 
then up again on the bridge and continuing upward, slowly, along the edge of 
the cloth, reached the top; then, sloivly, crawled to the opposite side and finally 
down the latter — 4 p. m. The caterpillar got off the cloth somewhat — on bare 
material — two or three times, on its way across and down the opposite side. 
It apparently never got into the molasses-flour band with more than the first 
pair of legs and often only with the mouth parts. 
Similarly, by means of flour-paste and molasses-flour bands, caterpillars were 
forced to cross even higher gipsy moth tree-banding material bands with 
narrower bridges — \ inch and \ inch wide. 
Experiment C. 
(Day bright and very warm.) 
ELEMENTS. 
1. Caterpillar. 
Fifth stage ; rather small for the stage, pretty well advanced, well fed. 
2. Odorous band (ring on stake). 
Gipsy moth tree-banding material, good x 5 e inch thick and 2 inches wide, 
around a peeled stake 2\ incbes in circumference and 21 inches high, lower plane 
of band 6 inches from platform to which stake was fixed ; lower plane of band 
quite flat, upper somewhat less so. With very strong odor. Band bridged with 
strip of cheesecloth (medium mesh. 29 by 34 threads per square inch) § inch 
wide ; cloth fitting closely to band at all points and extending from inner circle 
of lower plane to inner circle of upper — not extending beyond band. Cloth 
stained dark by material, and odor over it almost as strong as over unbridged 
part. 
3. Strip of stiff white paper 4 inches long and 1 inch wide. 
4. Paste band (horizontal). 
Flour paste made of flour and water, -^ inch high, 1 inch wide, and 3 inches 
long, on a strip of paper like and of same d'mensions as 3; paste somewhat 
more viscid, or sticky, than gipsy moth tree-banding material. 
TESTS. 
The caterpillar was placed on the stake 4 inches below and facing the odorous 
band (2) (11.42 a. m.). It did not begin to crawl until it was prodded, then 
crawled right up to the band, except that it swung its head when about 2* inches 
and again when 2 inches below it, and swung on with the first pair of legs, but 
after touching it with its mouth parts swung hastily off. This was soon 
repeated, and shortly after it swung on and off again, after touching it, hesi- 
tatingly, with its mouth parts twice. Soon, however, it swung on the band a 
fourth time, and after touching it as before swung hastily off ; then turned down- 
ward and crawled down the stake. It rubbed its mouth parts against the stake 
several times as it swung off the band and turned downward. 
The caterpillar was placed again as before and crawled to within about 3 
inches below the band, after being redirected upward at the very start, and 
reared and swung its head violently three times. It repeated this once or twice 
2 inches below, thence crawled cautiously and when close to the band stretched 
upward and got on it with the first pair of legs, but swung down to about 
f inch below, after touching it with the mouth parts twice in quick succession. 
Then, after circling nearly one-half the stake, it reached the band again and 
swung on again, hesitatingly, with the first pair of legs, but swung down again 
quickly after touching it again with the mouth parts ; then turned and crawled 
slowly down the stake. 
Placed a third time, the caterpillar swung its head and hesitated at the 
very start, but continued upward, swinging its head frequently, and when 
about 1^ inches below the band slowed down still more and became still more 
hesitant. Finally, when close to the band, it reached up to it with the first 
pair of legs, and after touching it twice in quick succession with the mouth 
parts also, it turned away. Soon afterwards it swung on a second time with the 
first pair of legs, hesitatingly (near the edge of the bridge), and after touching 
it with the mouth parts swung over on the bridge, then off the band altogether. 
After a pause it swung on a third time, on the bridge, thence over on bare mate- 
rial ; after touching the latter with the mouth parts it swung off altogether and 
turning around started downward. It paused about | inch below the band when 
