﻿12 BULLETIN L142, U. & DEpPABlJMENT OF -UiMCULTURE. 



on the side of the band and off, slowly, lauding again at the foot of the bridge, 

 then up again <>n the bridge and continuing upward, slowly, along the edge of 

 the cloth, rt ached the top; then, slowly, orawled to the opposite side and finally 

 down tlic latter — 4 p. m. The caterpillar got off the cloth somewhat — on hare 

 material — two or three times, on its way across and down the opposite side. 

 It apparently never got into the molasses-llour hand with more than the first 

 pair of legs and often only with the mouth parts. 



Similarly, by means of nour-paste and molasses-flour bands, caterpillars were 

 forced to cross even higher gipsy moth tree-banding material bands with 

 narrower bridges — i inch and £ inch wide. 



Experiment C. 



(Day bright and very warm.) 



ELEMENTS. 



1. Caterpillar. 



Fifth stage; rather small for the stage, pretty well advanced, well fed. 



2. Odorous band (ring on stake). 



Gipsy moth tree-banding material, good t\ inch thick and 2 inches wide, 

 around a peeled stake 2^ inches in circumference and 21 inches high, lower plane 

 of band 6 inches from platform to which stake was fixed ; lower plane of band 

 quite fiat, upper somewhat less so. With very strong odor. Band bridged with 

 strip of cheesecloth (medium mesh, 29 by 34 threads per square inch) A inch 

 wide ; cloth fitting closely to hand at all points and extending from inner circle 

 of lower plane to inner circle of upper — not extending beyond band. Cloth 

 stained dark by material, and odor over it almost as strong as over unbridged 

 part. 



3. Strip of stiff wh'ite *paper 4 inches long and 1 inch wide. 



4. Paste band (horizontal). 



Flour paste made of flour and water, -fa inch high, 1 inch wide, and 3 inches 

 long, on a strip of paper like and of same dimensions as 3: paste somewhat 

 more viscid, or sticky, than gipsy moth tree-banding material. 



TESTS. 



The caterpillar was placed on the stake 4 inches below and facing the odorous 

 band (2) (11.42 a. m.). It did not begin to crawl until it was prodded, then 

 crawled right up to the band, except that it swung its head when about 2* inches 

 and again when 2 inches below it, and swung on with the first pair of legs, but 

 after touching it with its mouth parts swung hastily off. This was soon 

 repeated, and shortly after it swung on and off again, after touching it, hesi- 

 tatingly, with its mouth parts twice. Soon, however, it swung on the band a 

 fourth time, and after touching it as before swung hastily off; then turned down- 

 ward and crawled down the stake. It rubbed its mouth parts against the stake 

 several times as it swung off the band and turned downward. 



The caterpillar was placed again as before and crawled to within about 3 

 inches below the band, after being redirected upward at the very start, and 

 reared and swung its head violently three times. It repeated this once or twice 

 2 inches below, thence crawled cautiously and when close to the band stretched 

 upward and got on it with the first pair of legs, but swung down to about 

 J inch below, after touching if with the mouth parts twice in quick succession. 

 Then, after circling nearly one-half the stake, it reached the band again and 

 swung on again, hesitatingly, with the first pair of legs, but swung down again 

 quickly after touching it again with the mouth parts; then turned and crawled 

 slowly down the stake. 



Placed a third time, the caterpillar swung its head and hesitated at the 

 very start, but continued upward, swinging its head frequently, and when 

 about 1A inches below the band slowed down still more and became still more 

 hesitant. Finally, when close to the band, it reached up to it with the first 

 pair of le.L's. and after touching it twice in quick succession with the mouth 

 parts also, it turned away. Soon afterwards it swung on a second time with the 

 first pair of legs, hesitatingly (near the edge of the bridge), and after touching 

 it with the mouth parts swung over on the bridge, then off the band altogether. 

 After a pause it swung on a third time, on the bridge, thence over on bare mate- 

 rial ; after touching the latter with the mouth parts it swung off altogether and 

 turning around started downward. It paused about £ inch below the band when 



