1912] Conotrachelus Nenuphar Herbst | 399 
paper, that the behavior of Conotrachelus serves to corroborate 
these conclusions and it is a striking fact that the response can 
be secured upon such slight contact stimulus, scarcely more 
than a touch being necessary to elicit a well marked death 
feint. The fact that the body deprived of its head, can be 
induced to give the response, removes the greater part of the 
psychic speculation in regard to the nature of the instinct. 
Just what the value of it to the curculio in its native environ- 
ment may be is largely a matter for conjecture; but that it has 
been used very effectively in combatting this common and 
injurious insect remains an incontrovertible fact. 
It is with grateful appreciation that the writers here express 
their indebtedness to Dr. S. J. Holmes for the valuable sugges- 
tions arising from his critical reading of this article. 
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Breeding habits of the crayfish. Amer. Nat. XX XVIII, 1904. pp. 165-206. 
2. Darwin, C. 
Appendix in Romanes, G. J. Mental Evolution in Animals, 1884. 
3. DeGeer, C. 
Memoirs pour servir a l'histoire des insectes. IV, p. 229. 
4. Fabre, J. H. 
Souvenirs Entomologiques. Paris. 7e series pp. 14-27. 
5. Holmes, S. J 
Death feigning in terrestrial amphipods. Biol. Bull. IV, pp. 191-6. 1903. 
Death feigning in Ranatra. Journ. Comp. Neur. and Psychol. XV, 1906. 
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The Instinct of Feigning Death. Pop. Sci. Monthly, LXXII, 1908. 
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8. Johnson and Girault. 
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