46 



Annals Entomological Society of America [Vol. XII, 



to the distance of 73^ inches. Again the larva was touched 

 lightly on the right side of the body. The head was immediately 

 turned to the right whereupon a sudden pinch with forceps 

 caused the liquid to be projected in a fine spray almost entirely 

 on the right side of the body. In all, this larva was irritated 

 seven distinct and successive times. It responded to each of 

 the first six irritations by an ejection of liquid although in a 

 lesser quantity toward the end, while no response was obtained 

 from the seventh irritation. Evidently the supply became 

 exhausted or the larva became fatigued and indifferent to the 

 irritation. 



c 







w 



Fig. 1. Spray pattern (}4 size), reproduced from litmus paper, of one ejection'of 

 liquid by a vigorous larva. C, position of caterpillar. 



