INSECT DIAPAUSE AND ENVIRONMENT 129 



1^ H. Tsuji, Japan. J. Appl. Entomol. Zool., 3 (1959) 34. 



15 H. A. SCHNEIDERMAN AND J. HORWITZ, /. Exptl. BioL, 35 (1958) 520. 



16 R. Perron, Acta Zool. (Stockholm), 35 (1954) 71. 



1' I. W. KozHANTSHiKOv, Eutoiuol. Obozrcniye, 31 (1950) 178. 



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20 J. R. Le Berre, These, Fac. Sci. Univ. Paris, 1957. 



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2^ A. S. Danilyevsky, Vestnik Leningrad Univ., 21 (1957) 93. 



DISCUSSION 



Galun: Since insects do not see red light, it would be 

 interesting to compare the spectrum for photoperiod sensitivity 

 with the light spectrum. 



Lees: There is very little information on this subject although 

 Geispits has examined various species of Lepidoptera from this 

 point of view. He found that roughly the same wavelengths 

 produced visual and photoperiodic responses and he therefore 

 concluded that the simple eyes were in fact the photoperiodic 

 receptors. But even if the action spectrum is identical this 

 conclusion may not be warranted. 



Galun: It could indicate that the same pigment is involved, 

 if not the same organ. 



Lees: Yes. Photolabile pterins have recently been demon- 

 strated in the insect compound eye; and it is possible that we 

 should think of these substances in searching for the photo- 

 periodic pigment. 



Kohn: You said that diapause is an inherited characteristic 

 rather than a condition, but you mentioned too that environ- 

 mental influences on the adult insect resulted in changes in the 

 diapause, the larvae and the eggs. You also said that there must 

 be a way of transferring the information from the adult to the 

 stage in which diapause occurs. Would it be possible that the 

 information is recorded on genetic material? 



