﻿BARRIER FACTORS IN GIPSY MOTH TREE-BANDING MATERIAL. 5 



but swung down almost immediately. It turned toward the band again, how- 

 ever, after crawling along it for a short distance, about I inch away, and, on 

 reaching it, swung on a second time and hesitatingly crawled up and across. 



Band 5, odor quite marked, somewhat damp to touch : 11.40 a. in. 



The caterpillar was placed 6 inches from and facing the band. Jt hesitated 

 when about i inch from it, then went to it and swung on with two pairs of 

 legs, but swung down after lingering on it a few moments. Then it moved 

 along the band nearly to the end, at a distance of about \ inch, when it sud- 

 denly swung away still farther and crawled away. 



Placed again, the caterpillar turned out of a straight course slightly, when 

 about i inch from the band, and again when about £ inch away; it then 

 stretched toward the band and brushed it with its mouth parts, following which 

 it swung away and crawled off the sheet of paper. 



The caterpillar was placed a third time. It paused when within \ inch of 

 the band, then moved closer, swung on with two pairs of legs, and brushed 

 the band with its mouth parts three times in succession. Then it swung down ' 

 and crawled away. 



Placed the fourth time, the caterpillar turned at right angles when about 

 i inch from the band and crawled away. 



When placed the fifth time, the caterpillar approached within about i inch 

 of the band, hesitated, stretched forward, and got on the band with the first 

 pair of legs. After getting on a little farther, it swung off and crawled away — 

 11.50 a. in. 



For the sixth time the caterpillar was placed (1.25 p. m.). It turned when 

 close to the band and crawled away. 



At the seventh placing the caterpillar swung upon the band with the first pair 

 of legs, then swung off; soon after it swung up with two pairs and swung off, but 

 very soon after swung on a third time and crawled hesitatingly across. 



Experiment B. 

 (Day more or less bright and fairly warm.) 



ELEMENTS. 



Caterpillar. 



Fifth stage ; quite well along, fairly large. 



Bands (horizontal). 



1. Flour paste band made of flour and water, its to tj inch high, 1| inches 

 wide, 6 inches long. 2. Solid band made of flour and water (hardened), J inch 

 high, 1$ inches wide, 6 inches long, sides practically vertical. 3. Solid band 

 made of flour and a mixture of coal-tar pitch and coal-tar neutral oil (at the 

 rate of 2 ounces flour and 1$ ounces pitch and oil mixture), i to tfr inch high, 

 about 1^ inches wide, 5 inches long, sides vertical. 



All on sheets of white paper. 



TESTS. 



Band 1: 2.35 p. m. 



The caterpillar was placed nine distinct times on the sheet of paper, 5 inches 

 from and facing the band. During the course of 42 minutes it made 15 attempts 

 to cross the band, but backed out or turned away each time it came more or less 

 in contact with it. 



Band 2: 3.25 p. m. 



The caterpillar was placed 5 inches from the band, as in the preceding test. It 

 turned at an angle when about 2 inches from the band and crawled around 

 the end. 



The caterpillar was placed again.. It swung upon the band with the first pair 

 of legs and after some slight hesitation crawled up and then across. 



Placed a third time, the caterpillar turned out of a straight course somewhat 

 when about 3 inches from the band ; then got to the band and touched it with 

 its mouth parts several times in quick succession; then crawled up slowly and 

 across. 



Band 3, with strong odor, somewhat damp to touch : 4.15 p. m. 



The caterpillar was placed 5 inches from the band, as before. It turned away 

 slightly on reaching and touching the band with its mouth parts three or four 

 times in rapid succession, but soon turned back and, after touching it as before, 

 turned and crawled away, shaking its head nervously. 



