BARRIER FACTORS IN GIPSY MOTH TREE-BANDING MATERIAL. 9 
Twelfth placing: The caterpillar turned out of a straight course about 4 
inches from the band and stopped for a few seconds when the strip of 
paper was interposed. Being guided by means of the strip of paper it got 
to within i inch of the band, though constantly trying to turn out of the course. 
Following a pause it started to turn away again, but the strip of paper 
arrested it once inore. Then it reached the band, but turned away almost 
immediately. It is impossible to say whether it touched the band. Crawling 
upon the strip of paper it reached over to the band and got on it with two 
pairs of legs,' but after touching it with its mouth parts turned away. Getting 
over on the opposite side of the strip of paper, it crawled off and away. 
Thirteenth placing: The caterpillar began to turn out of a straight course 
about 1* inches from the band, but was arrested by the strip of paper. Fol- 
lowing a pause it continued hesitatingly toward the band; when about \ inch 
from it (opposite the bridge), it crawled up the strip of paper and stretched 
toward the bare part of the band; it turned away, however, and getting over 
on the opposite side of the strip of paper it crawled off and away. 
Fourteenth placing: The caterpillar started to turn out of its course about 
1$ inches from the band after it had stopped and reared and swung its 
head three or four times, but turned in the direction of the band again when 
the strip of paper was placed in its way. It stopped again about % inch away 
(opposite the bridge), and then turned and crawled upon the strip of paper, 
the edge of the farther end of which rested against the band at one side of 
the bridge. On getting closer to the band it swung on the bare part of the 
latter and apparently touched it twice, then over on the bridged part and 
swung off almost immediately. It reached forward toward the band again 
soon after, hesitatingly, but swung away again. It is impossible to say whether 
it touched. Turning around, it got over on the opposite side of the strip of 
paper, and finally crawled off and away. 
Fifteenth placing: The caterpillar halted and started to turn away when 
within about 1\ inches (opposite the bridge), but turned in the direction of 
the band again when the strip of paper was interposed. It crawled upon the 
strip of paper, however, when about £ inch from the band, and when close 
to the latter swung upon it (the bare part) and apparently touched it twice 
lightly, then swung in the opposite direction and landed on the bridged part. 
After brushing the cloth three times with the first pair of legs and month pnrts 
it swung over on the bare part again and then back to the strip of paper, then 
crawled over, hesitatingly, on the opposite side of the latter and crawled down 
and away. 
Sixteenth placing: The caterpillar was stopped from turning out of its 
course about 2 inches from the band by means of the strip of paper. After 
some hesitation on its part, during which it started to crawl up the side of 
the paper rather than to continue in the direction of the band, it started toward 
the latter, the strip of paper keeping it in its course. It stopped again about 
1 inch away (opposite the bridge), and on resuming crawled up the strip of 
paper, but when within $ inch of the band it stopped once more. Finally it 
turned away, and after some hesitation got on the opposite side of the paper 
and crawled off and away. 
Seventeenth placing: The caterpillar stopped and turned at a right angle 
about i inch from the band, and turned completely around and started to crawl 
in the opposite direction when the str'p of paper was placed in its path. It 
turned completely around a second time when the strip of paper was again 
interposed, but kept right on, crawled upon the strip of paper when it was 
interposed a third time, and crawled off it and away, after getting, hesitat- 
ingly, to the opposite side of the same. (The edge of the farther end of the 
strip of paper rested against the band each time it was interposed, and always 
at either of adjoining sides of the bridge, so that up to the time it crawled upon 
the strip of paper the caterpillar was constantly opposite the bridged portion 
of the band.) 
Eighteenth placing : The caterpillar was placed once more 6 inches from the 
band 12 (now 4.17 p. m.). It stopped (opposite the bridge), reared once or twice, 
and started to turn out of its straight course, about If inches away, but turned 
in the direction of the band again on touching the paste band (4) which was 
placed in its way (horizontally). On reaching the band (which it had ap- 
proached hesitatingly) it swung upon the bridge with all legs, and from here, 
after some hesitation, over on the bare part, but swung back to the bridge 
almost immediately and started slowly upward (the cloth now being thoroughly 
13 Unless otherwise stated or implied, the term " band " refers to the odorous band. 
