﻿BARRIER FACTORS IN GIPSY MOTH TREE-BANDING MATERIAL. ] 1 



of paper (3) was placed in its way (as in Experiment A), whereupon it turned 

 completely around and began to crawl in the opposite direction (parallel to 

 the band). As the strip of paper was again interposed it stopped altogether 

 (opposite the bridge). It backed up finally, turned, and began crawling in 

 the direction away from the band, but as it came close to the strip of paper, 

 which was interposed again, it turned at an angle and started (diagonally^ 

 toward the band — the strip of paper guiding it in that general direction. It 

 got upon the strip of paper, however, when about $ inch from the band, and 

 soon got off again, but after a pause got on once more and after getting over 

 on the opposite side it crawled off it and away. 



At the fourth placing, the caterpillar halted at the very start and had to be 

 prodded (one-half minute later) to get it started again. It responded very 

 slowly. It swung its head slightly, and, turning at right angles, started to crawl 

 away (parallel to the band). It executed another right-angled turn as the strin 

 of paper was placed in its way (now facing away from the band), and still 

 another, when the paper was interposed as it started to crawl directly away 

 from the band, being now parallel to the band. It halted and finally came to 

 rest when the strip of paper was placed in its way a third time. It began to 

 crawl about 1| minutes later, and as the strip of paper was placed in its 

 way it turned in the direction opposite from the band ; very soon after, 

 when the strip of paper was interposed again, it turned at right angles (parallel 

 to the band again) and started to crawl away once more. This time it crawled 

 upon the interposed strip of paper and after crawling on it a short distance 

 toward the band, it got on the opposite side and finally crawled off it, pausing 

 and swinging its head before crawling away. At no time was the caterpillar 

 nearer than 5 inches to the band. 



The caterpillar was placed a fifth time. It started to turn out of its course 

 at once and was redirected. Finally, after a good deal of hesitation through- 

 out, it approached within 1* inches of the band. 13 . It turned at right 

 angles here and started crawling parallel to the band, but on getting some of 

 its legs into the molasses-flour band (4), which was placed in its way (hori- 

 zontally), it turned in the direction opposite from the band; soon after — after 

 touching the molasses-flour band as before — it turned at right anedes n third 

 time, and after crawling somewhat (parallel to the band) and touching the in- 

 terposed molasses-flour band again (three times) it turned once more, away 

 from the band. It turned at right angles a fifth time, soon after, because of 

 the molasses-flour band (bringing it parallel to the band again)', and on touch- 

 ing the molasses-flour band again it once more turned in the direction of the 

 band. It swung upon the side of the band, on finally reaching it, then down, but 

 swung back on it on touching the molasses-flour band (which was waiting for it 

 at the foot of the band), and landed at the foot of the bridge on finally 

 swinging off a second time. It swung upon the bridge soon after and crawled 

 up and finally across to the opposite side — tumbled off in going down latter 

 side. Once, while on top of the band, it got partly off the cloth with some of its 

 legs on bare material, but soon got back. 



Placed a sixth time, the caterpillar swung upon the side of the band on 

 finally reaching it (having crawled very slowly and hesitatingly from within 

 about 1 inch), and after lingering a few moments swung down. It swung on 

 and off again shortly afterwards, and after a pause started crawling parallel 

 to the band (at a distance of about f inch) ; on touching the molasses-flour 

 band, which was placed in its way, it stopped and backed up. On resuming 

 and touching the same a second time it turned at right angles and started 

 crawling directly away from the band. It turned the other way again, how- 

 ever, on touching the molasses-flour band a third time (now parallel to the band 

 again) , and on touching it a fourth time it turned and headed directly toward the 

 band. It swung up on the side on reaching it and finally got on with its whole 

 body but soon tumbled off, landing at the foot of the bridge. Then it swung 

 upon the latter (on the side of the band) with some of its legs, and after 

 brushing it with these it swung over on the uncovered part but soon swung back 

 to the cloth, then again to the bare part, then off entirely and started crawling 

 parallel to the band ; on touching the molasses-flour band it turned and com- 

 menced crawling directly away from the band. It turned at right angles again, 

 however, on touching the molasses-flour band again, twice (now parallel to the 

 band again), and after touching again shortly after, three times in succession, 

 it turned and headed directly toward the band once more. It swung up again 



13 See footnote on p. 9. 



