TARSAL SENSITIVITY IN PYRAMEIS 457 



2. After prolonged inanition with respect to saccharose the 

 threshold concentration may fall as low as M/3200, M/6400, 

 or even M/12,800 in some individuals. The tarsal sensitivity 

 of Pyrameis to saccharose may thus be as much as 256 times that 

 of the human tongue. 



3. The highly developed sensitivity to saccharose is doubtless 

 correlated with the fact that sugars form the chief food of this 

 insect. 



BIBLIOGRAPHY 



Fabre, J. H. 1879-1904 Souvenirs entomologiques. 7me serie, nos. XXIII, 

 XXIV, XXV. 8me edition. Paris. 



MiNNiCH, D. E. 1921 An experimental study of the tarsal chemoreceptors of 

 two nymphalid butterflies. Jour. Exp. Zool., vol. 33, pp. 173-203. 

 1922 The chemical sensitivity of the tarsi of the red admiral butter- 

 fly, Pyrameis atalanta Linn. Jour. Exp. Zool., vol. 35, pp. 57-81. 



Parker, G. H. 1912 The relation of smell, taste, and the common chemical 

 sense in vertebrates. Jour. Acad, of Nat. Sciences of Phila., vol. 15, 

 second series, pp. 221-234. 



Riley, C. v. 1894 The senses of insects. Insect Life, vol. 7, pp. 33-41. • 



