280 Mr. A. R. Wallace's Nides 



from this locality, it would be impossible to determine 

 how far this is linked to the more ordinary forms by in- 

 termediate types. We seem, therefore, to have here a 

 species partly separated into several tolerably distinct 

 forms or races, which only require to be isolated by 

 changes of land and sea to become well-marked species. 

 It may also be remarked, that although the sexes are 

 generally strikingly different, there are individuals whose 

 sex it is impossible to determine without an examina- 

 tion of their structural characters, and which form a com- 

 plete gradation from one to the other. If any Entomo- 

 logist would devote himself to the study of this species, 

 by collecting every possible variety of form from every 

 locality in which it is found, it would alone furnish 

 materials for a most instructive essay, which might go 

 far towards elucidating the process of the formation of 

 species. 



2. DiADEMA MiSIPPUS. 



? . Papilio Misippus, Linn. Syst. Nat. ii. 767. 



? . Papilio Biocippus, Cram. 28, B. C. ; Fabr. Ent. 



Syst. iii. pt. i. p. 51. 

 $ . Papilio Inaria, Cram. 214, A. B, 

 $ . Papilio Bolina, Cram. 65, E. F. {nee Linn.). 

 Hah. — Java, Borneo, Lombock, Timor, Celebes, India, 

 China, Formosa, Australia, Africa. 



This species is remarkable for the striking contrast of 

 the sexes : the female resembles Danais Chrysippus, in 

 company with which I have often taken it flying, when 

 the two were indistinguishable. Specimens occasion- 

 ally show a slight approach of the sexes to each other, 

 and in the British Museum is a hermajshrodite, one side 

 of which is male, and the other female. The form Inaria, 

 which seems common in Africa, is rare in the East, 

 where there is no Danais it resembles. 



3. DiADEMA AlIMENA. 



(J. Papilio Alimena, Linn. Syst. Nat. ii. 780; Clerck, 

 Ic. pi. 32, f. 1 ; Cramer, 221, A. B. C. 



$ . Papilio Porphyria, Cramer, 255, E. F. 



$ . Papilio Velleda, Cramer, 349, CD. 



