Temperature Experiments on two To'opical Butterflies. 451 



of inaria. In October 1909 from a normal diocippus ^ I 

 obtained 250 eggs ; there were 50 deaths from one cause 

 or other and 197 resulting butterflies, 110 ^$s and 87 $$s, 

 all without exception of the cliocippus form. In October 

 of the following year I bred 225 from another female of 

 the same form ; the result was 84 ^^s and 76 $$s, all 

 typical cliocippus, except five which were slightly speckled 

 with red on the three small apical spots on the forewing ; 

 the remainder of the brood, 65 in number, I experimented 

 with. (CI, Cla, etc.) 



These results contrast in a most remarkable manner 

 with those of the Rev. St. Anbyn Rogers in East Africa. 

 He writes to me, "From an intermediate between the 

 type and inaria form, but on the whole nearer the former, 

 I obtained about 50 <^^s and 49 $$s, but all inaria, some 

 slightly alcippoides. In the following year an inaria laid 

 100 eggs, resulting in 60 $$& and 36 $$s, the whole 

 diocippus ! Weather dry." He added, " If inaria is the 

 dry weather form (as I had surmised it being so uncommon 

 in damp Ceylon), the offspring should be inaria." * 



Mr. G. F. Leigh in Natal obtained from an intermediate 

 female 8 ^,^8, 5 diocippus and 3 inaria. 



These results probably have a Mendelian interpretation, 

 but they throw no light on the origin of these two forms. 



Turning now to the results obtained ; the butterflies 

 exhibited are labelled A, B, C, Cla, etc. 



Those labelled A, consisting of 9 ^^s and 55 $$s, the 

 parent of which is also shown, form diocippus, are part of 

 the brood of 197 bred in October 1909, and show the 

 normal appearance of the species as it occurs in Ceylon. 

 They are in no way selected. 



Those labelled B were from a similar parent to A, and 

 only a few eggs were laid. They were all treated artificially, 

 but as it was open to any one to say that they might have 

 produced these abnormal forms under natural conditions, 

 I took a third brood C, which I divided into two. One 

 half was reared under natural conditions and produced 

 all normal ^^s and diocip)pus $$s ; the other half I again 

 divided into two, treating one portion artificially in the 



* In a subsequent letter dated 23.11.1911 he writes, "I got a 

 9 of the type form from which I bred 73 $ (^sand 56 $ ? s, of 

 which 38 were of the type form and 18 of the inaria form and no 

 intermediates." See Proc. Ent. Soc, 1911, p. xliv, and also 1912, 

 p. Ixxiii. 



