﻿6 BULLETIN 1142, U. S. DEPARTMENT OF AGRICULTURE. 



The caterpillar was placed again. It paused and shook its head when about 

 * inch from the band, then hesitatingly and nervously moved to the band and 

 touched i! lightly with its mouth parts two or three times in rapid succession, 

 brushed it with two pairs of legs, and turned away. It turned toward the hand 

 again, however, soon after, and swung up to the top with two pairs of legs, but 

 after touching it with its mouth parts and swinging its head several times 

 it swung down and crawled away. 



Placed a third time, the caterpillar hesitated about \ inch away, then moved 

 to the band and after touching it with its mouth parts lightly and brushing it 

 w th two pairs of legs., swung down. It repeated this shortly after and crawled 

 away. 



Placed a fourth time, the caterpillar began to hesitate when about 3 inch from 

 the band, but finally reached it and continuing hesitatingly crawled up and 

 across, swinging its head constantly while on the band. 



The caterpillar was placed a fifth time. It swung upon the side of the band 

 . with its first pair or two pairs of legs and touched it lightly and rapidly with 

 its mouth parts two or three times and swung down, but soon afterwards it 

 moved toward the band again and after a slight pause swung up a second time 

 (with two pairs of legs). After a few moments it started to swing off, hut 

 Swung back almost immediately and after some further hesitation crawled up 

 and then across — 4.45 p. m. 



Experiment C. 



(Day bright and warm.) 



ELEMENTS. 



Caterpillar. 



Fourth stage; fairly well along, medium size for the stage. 



Bands (rings on stakes). 



1. Flour paste band made of flour aud water, 1J inches wide, tV inch thick. 

 2. Solid band made of flour and water (hardened), 2 inches wide, i to f inch 

 thick, bottom plane nearly flat. 3. Solid band made of flour and coal-tar neutral 

 oil (at rate of 2 ounces flour and 1 ounce oil), li inches wide, &+ inch thick, 

 bottom plane practically flat. 



All on peeled upright stakes, 20 inches high and about 2\ inches in circum- 

 ference, lower edge of bands about 8* inches from platform to which stakes were 

 fixed. 



TESTS. 



Band 1: 1.45 p. m. 



The caterpillar crawled up each of the four distinct times that it was placed 

 at the base of and facing the stake, and during the course of 35 minutes made 

 40 attempts to cross the band, but backed out or turned away each time it came 

 more or less in contact with it. 



Band 2: 2.45 p. m. 



The caterpillar was placed twice at the foot of the stake, as before. It 

 crawled up and crossed the band without hesitation each time. 



Band 3, with marked odor: 3.20 p. m. 



The caterpillar was placed at the foot of the stake, as before. It seemed to 

 hesitate slightly about I inch below the band, but with that exception moved 

 right up to the band and paused ; then, after crawling somewhat, swung upon 

 the band and started upward. It progressed slowly, however, and when on 

 with the anter'or half of the body fell over backward, but clung to the stake 

 With the last pair of prolegs. On swinging back to the band it resumed its 

 upward climb. As before, its progress was slow; it was constantly working 

 its let:.s and mouth parts and constantly applying the latter to the band, scratch- 

 ing up the surface. It persevered, however, and finally crossed the band, coming 

 to rest about 1$ inches above it. Nearly two minutes was occupied in crossing. 



The caterpillar was placed again. It crawled up slowly, came to rest about 

 one-half inch below the band, and did not become active again for about 

 four minutes, when it swung its head two or three times and moved up to within 

 one- third inch. Here it rested for two minutes, and on being touched at the 

 anal end with a small camel's-hair brush started upward again. On reaching 

 the band it swung upon it with the first pair of legs, but after touching it with 

 its mouth parts a number of times in rapid succession it swung off. It swung 

 up a second time soon afterwards and swung down again after behaving as 



