62 



PSYCHE. 



IMay 1897. 



searches of Barker,* Brandes,! Butler,}: 

 and others that tropical butterflies 

 exhibit seasonal dimorphism. It has 

 occurred to me that this may possibly be 

 due to the direct influence of the vary- 

 ing humidity upon the pupae. Pupae 

 reared in a dry atmosphere may give 

 rise to the dry season form, while those 

 reared in a humid atmosphere may give 

 rise to the wet season form. I am 

 assured by Mr. E. A. C. Olive of Cook- 

 town, Queensland, Australia that the 

 development of pupae in that region is 

 more rapid in the wet season than in 

 the dry. 



I freely admit that Weismann's 

 "adaptive" seasonal-dimorphism may 

 exist, but I believe that the explanation 

 given in this paper is more probable. 

 I hope that some of the many able 

 entomologists who are carrying out re- 

 searches upon seasonal-dimorphism will 

 test its truth or falsity by experiment. 



Liteyatiire Recording Tempeyatnre Rxperi- 

 menis upon Lefidoplera. 



Doifmeister, G. '64. — Mittheil. des naturwis- 

 sen. Vereins fiir Steiermark, Heft II. p. 

 99, Plate. 



• Barker, C. W.; Notes on Seasonal-Dimorphism of 

 Rliopalocera in Natal. Trans. Ent. Soc. Lond. 1.S95, pp. 



t Brandes, G.; Der Saison-Diinorphismus bei einheimi- 

 schen und exotischen Schmetterlingen. Zeit. Naturw. 

 Leipzig, 66. Bd., pp. 277-300, Fig. T. 2. 1894. 



i Butler, A. G.; Notes on Seasonal-Dimorphism in Cer- 

 tain African Butterflies. Trans. Ent. Soc. Lond. 1895, pp. 

 519-522. 



Dorfmeister, G. '79. — Mittheil. des naturwis. 



sen Vereins fiir Steierinark, Jahrgang 



1S79, P- 3- Plate. 

 Edwards, W. H. 'eS. — " The Butterflies of 



North America," Philadelphia, and Bos- 

 ton, 1 868. 

 Edwards, W. H. '75. — The Canadian ento- 

 mologist, Vol. vii, p. 22S. 

 Edwards, \V. H. '77. —The Canadian 



entomologist, Vol. viii, p. 203. 

 Edwards, W. H. 'So. — Psyche, Vol. 3, No. 



69, p. 3. 

 Edwards, W. H. 'Si. — Psyche, Vol. 3, No. 



82, p. 174. 

 Edwards, W. H. '84. — The Canadian Ento- 

 mologist, Vol. xvi, p. 232. 

 Fischer, E. '95.— Transmutation der Schmet- 



terlinge infolge Temperatarunderungen, 



Berlin, 1895. 

 Merrifield, F. 'yo, '91, '92, '93, '94. — Trans. 



ent. soc. London, 1S90, p. 131; 1S91, p. 



155; 1S92, p. 33; 1S93, P- 55; 1S94, p. 



425- 

 Merrifield, F. '96. — Proc. ent. soc. Lond. ii, 



1S96. 

 Reichenau, W. von, '82. — Kosinos, Vol. 12, 



1SS2, p. 46. 

 Standfuss, M. '96. — Handbuch der palark- 



tischer gross-Schmetterlinge, Jena, 1S96, 



p. 236. 

 Stange, G. 86. — Stettiner entomolog. Zeit- 



ung, 1SS6, p. 279. 

 Weisinann, A. '75. — Studien zur Desendenz- 



Theorie, I. Leipzig, 1S7V 

 Weismann, A. 82. Studies in the Theory of 



descent. Translated by Raphael Meldola, 



London, 1SS2. 

 Weismann, A. '95. — Zoologische Jahr- 



biicher, Syst. Abth. Bd. 8, p. 611. See 



also translation of the same by W. E. 



Nicholson, The Entomologist, Vol. xxix, 



1S96, pp. 29, 74, 103, 153, 173, 202, 240. 



