﻿10 BULLETIN 1142, U. S. DEPARTMENT OE AGRICULTURE. 



moist and dark, as it had been for some time, saturated with the handing ma- 

 terial ). Continuing nervously the caterpillar crossed the hand and crawled 

 away. It got off the bridge, on bare material, once, when on top of the band, 

 but with no more than two pairs of legs, and drew back quickly. 



Nineteenth placing: The caterpillar hesftated, reared, and started to turn 

 out of its course about 5* inches from the band, but on touching the paste 

 hand with the first pair of legs, it turned toward the band again. It did not ad- 

 vance, however, but reared, swung its head, and backed up. Then, swing- 

 ing to one side, it started to crawl out of a straight course again (in the oppo- 

 site direction from that in the former attempt), hut on touching the paste 

 band, which bad been placed in its way again, with the first pair of legs at 

 least, it turned once more toward the hand and when within about 4A inch eS 

 of it. stopped. It now swung its head and turned to one side, and on touching 

 the paste hand, which was waiting fo.r it. it swung in the opposite direction 

 and stalled to turn away still farther from the hand. On being interrupted 

 by the paste band again, it turned once more toward the hand. and. after some 

 hesitation, started forward. Stopped about 1 inch away (opposite the briSgie), 

 and after rear'ng and swinging its bead, it turned at a right angle and started 

 crawling parallel to the band. On touching the paste band it turned com- 

 pletely around and started in the opposite direction, but on touching the 

 interposed paste band again it turned in the direction of the band once more. 

 On reaching the band it hesitatingly swung upon the bridged portion, and, after 

 brushing the cloth with its legs, it swung over on the bare part. Then, after 

 touching here once or twice, it swung off the band altogether. It swung back, 

 however, on touching the edge of the paste band, which was waiting for it, 

 then oxer on the bridge with the first pair of legs, and after touching here 

 with its mouth parts, it swung to the bare part again, then back to the 

 bridged portion, then up, hesitatingly and nervously, and to the opposite side 

 and doirn the latter — 4.55 p. m. The caterpillar got off the bridge, on bare ma- 

 terial, soon after reaching the top of the band, but with no more than two pairs 

 of legs, and drew back quickly. 



Experiment B. 



(Day bright and warm.) 



ELEMENTS. 



1. Caterpillar. 



Fifth stage ; medium size for stage, fairly well advanced, pretty well led. active. 



2. Odorous band "(horizontal). 



Gipsy moth tree-banding material, as in Experiment A, except $ inch longer 

 (6* inches long), with strong odor. Bridge moist and dark. 



3. Strip of stiff white paper 4 inches long and 1 inch wide. 



4. Molasses-flour band (horizontal). 



Molasses-flour mixture (molasses and white wheat flour), 2V inch high, 

 1 inch wide, 3 inches long, on a strip of paper like and of same dimensions as 

 3; of about the same cocsisteney as the commercial sticky tree-banding material 

 used in these experiments — somewhat more viscid than the flour paste used in 

 Experiment A. 



TESTS. 



The caterpillar was placed on the sheet of paper (i inches from and facing the 

 odorous band (2) at 1.51 p. m. It halted 5* inches away and reared twice, 

 repeated this movement A\ inches away, and reared again two or three times 

 at a distance of 4 inches. Then it turned slowly around and crawled away, 

 rearing from time to time as it did so. 



The caterpillar was placed again as before. It hesitated and turned its head 

 somewhat from side to side at the start, and stopped and reared three times 

 about 4$ inches away; repeated this at a distance of 3^ inches, and stopped and 

 reared again when within about 2 ; ; inches. Finally it turned at a right angle 

 and crawled away. 



When placed the third time the caterpillar hesitated and reared three dis- 

 tinct times during the first 4 inches of its course toward the hand, then turned 

 out of its course somewhat and made its way. hesitatingly, to within \ inch. 

 Here it stopped, reared, stretched forward, and brushed the hare part of the 

 band with the first pair of legs and mouth parts. As it turned away the strip 



