668 Dr. G. B. Longstaff's Bionomic Notes on Butterjius. 



It will be observed that (as we fouud in the case of A. 

 jatrophx) no distinctly "dry " specimens were taken out of 

 Jamaica. There is also evidence (very ambiguous in the 

 case of Tobago) that the "dry" form tended to displace 

 the " wet " as the season advanced. 



I had also the advantage of examining Mr. W. J. Kaye's 

 series of this insect. Of six specimens taken in Jamaica 

 in the month of August (wet season) 5 are of the " wet " 

 form, 1 of the " dry." Of two specimens taken in 

 Trinidad in July, one is " wet," the other " intermediate," 

 another taken in September is also "intermediate." A 

 specimen taken in British Guiana in either November or 

 December is " wet," 



These facts are fairly in accord with the theory that the 

 dimorphism is seasonal in the case of C. euhule, especially 

 if due allowance be made for the fact that the insect has 

 the appearance of being long-lived. 



Tcrias euteiye, Men. (Jamaica). My 60 specimens ex- 

 hibit but very trifling differences that can be set down 

 to possible seasonal dimorphism. 



The specimens that I am disposed to regard as exhibit- 

 ing Dry-season coloration may be distinguished by the 

 following characters on the binder surface. 



The reddish-orange edging of the wings is more con- 

 spicuous. The hind-wings are irrorated with purplish- 

 brown scales, and the purplish markings (especially the 

 borders of the apical pink patch) are more conspicuous. 



I do not give the results as set out in the following 

 table with much confidence, and the division of the 

 " intermediate " specimens into those inclining rather to 

 wet or to dry respectively should not carry much weight. 

 Subject to these limitations, it will be seen that the 

 specimens considered as " wet" were commonest at the 

 two extremities of the period, those considered as "dry" 

 prevailed throughout the first half of February. 



