Nos. 455-456.] HEARING AND SMELL IN SPIDERS. 863 



ascertain the normal reaction to odors, then upon individuals 

 variously mutilated in order to localize the olfactory sense. 



a. Observations on Unmntilated Individuals. 



Lavender.— Tests were made with eight females and seven 

 males and each responded by running from the stimulus. In 

 four cases this was accompanied by motions of the palps and 

 mandibles. 



Wintergrecn. Seven females and four males. In five cases 



the palps gave definite vibratory responses and in the others the 

 spiders turned away. 



Berganiot. — ^hi males and six females. Each time the 

 spiders turned away, and in seven instances responded with 

 motions of the palps. 



Cassia. males and six females. All but one turned 

 quickly away, and eight gave vibratory motions of the palps. 



Clove. ~ Six females and five males. One female gave 



response, six gave movements 



andibles, while 1 



responded also by turning away. 



Cedar. — Eight females and six males, 

 quite indefinite, palpal vibration in two ca 

 was no motion whatever. 



A Imond. — Seven females. No palpal movements were given 

 and the spiders turned away indifferently. 



Jumper-berries. — Eight females and six males. The re- 



slow and consisted generally 



away. The palps were moved slightly but not in a vibratory 



"^stard.-^ males and eight females. The responses 

 were no more decided than those given to strong oils of the 

 non-irritating class. In only one instance were there definite 

 palpal movements, and the spiders usually turned quickly away 

 at first, then later more slowly, as if overcome by the odor. 



Kk pepper. — Six males 



The respons 



were quite slow and given after prolonged stimulation. Vibra- 

 tory motions of the palps were entirely lacking. 



