866 



THE AMERICAN NATURALIST. [Vol. XXXVIII. 



remain motionless in their cages for hours together seems to 

 prove that the sound is not perceived in any measure, or at 

 least that it produces no response. All parts of the body are 

 extremely sensitive to touch and the spider responds immedi- 

 ately Jf it or the cage comes in contact with the vibrating 



3. Males and females respond exactly alike to stimuli of 

 smell and hearing. 



4. Pardosa responds normally to the essential oils by turning 

 away, making vibratory movements with palpa and mandibles, 

 and raising each leg as it is stimulated. 



5. Individuals from which the palps have been removed 

 respond to odors normally with each leg. 



6. Individuals with the first pair of legs removed respond 

 normally with the palps and the remaining three pairs of legs. 



7. Spiders that have had the sense hairs cut off or sand- 

 papered respond as do normal specimens. 



8. Specimens with the tarsal joint cut from each leg respond 

 as usual by raising each leg when stimulated. 



9. From the foregoing results it seems quite evident that 

 the ability to perceive odors is distributed over the whole 

 integument of the spider and there is no definitely localized 

 olfactory organ. 



The work for this paper has been done entirely under the 

 direction of Dr. T. H. Montgomery, Jr., and the writer is 

 indebted to hiiu for many valuable suggestions as well as 



BIBLIOGRAPHY. 



r die Augen und ein als Gehororgan gedeutetes Organ 

 en. Situngsb. Niederrhein. Ges. 1885. 



■vations on Spiders. Hertfordshire Nat. Hist. Soc. I. 



r die Horhaare bei den Arachniden. Zool. Anz. VI. 



