1927 
The Reaction of Datana Larvce to Sounds 
133 
finally it was elicited when all possibility of vibrations of the 
substratum were eliminated. 
These facts are supported by the results obtained when the 
hairs were loaded or removed, or when the body surface was 
anaesthitized. 
What is the significance of this peculiar sense? The larvae 
give marked responses to only two notes, which, even if they 
were frequent under natural conditions (which they certainly are 
not), could hardly be considered of importance to the caterpillars. 
They are, therefore, not adaptive. It is probable that we are 
here in the presence of a “secondary” sense, developed as a 
result of the adaptation of certain organs to more significant 
stimuli. 
Literature. 
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venirs Entomologiques by A. Teixeira de Mattos), 
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Kroning, F. 
1925. Uber die Dressur der Biene auf Tone. Biol. Zen- 
tralbl. 45, p. 496. 
Lutz, F . 
1926. Insect Sounds. Nat. Hist. Mag. 26, No. 2., p. 206. 
Minnich , D. E. 
1925. The Reactions of the Larvae of Vanessa antiopa 
Linn, to Sounds. Jour. Exper. Zool. 42, No. 4. 
Radi, E. 
1905. Ueber das Gehor der Insecten. Biol. Centralbl. 25. 
Turner, C. H. 
1914. An Experimental Study of the Auditory Powers of 
the Great Silkworm Moths. Biol. Bull. 27, No. 6. 
Turner , C. E. and E. Shwarz 
1914. Auditory Powers of the Catocala Moths; an Ex- 
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