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Greatest length of costa of the S 73 mms., least length 

 about 64 mms. ; of 2 , greatest length 80 mms. ; least 

 length, 60 mms. 



In the museums of the Hon. Walter Rothschild S and 

 2 , the Author, $ , Mr. H. J. Elwes, $ and 2 , Mr. H. 

 Grose-Smith, $ , M. Oberthiir, and others. 



Hab. Lirung or Salibobo, Talautse Islands (Doherty). 

 Feb. to March 1892. 



Setting aside the remarkable precostal character of the 

 male, which allies it to P. hephcestus, the nearest affinity of 

 the male is with P. Plateni on the upperside, appearing 

 like an immaculate var. of that Philippine species. On 

 the under surface of the lower wing the yellow marks 



suggest an approach to those of haliphron ; the female 

 also on the upper wing, and somewhat on the under 

 surface, comes nearer to the haliphron facies*. The out- 

 line of the male primary wing is unlike that of any other ; 

 nevertheless we have in this species a close ally of Plateni 

 and possibly an old form from which perhaps several of 

 the varieties of the haliphron and helena groups have been 

 derived by differentiation — a transitional species, the dis- 

 covery of which I have long anticipated. After awhile 

 other transitional forms will, I hope, be found, and we 

 may then be able to understand some of the geographical 

 development history of the genus. 



* Since writing the above I have been able to compare the females with a female 

 of Pompeoptem iris, Rober, in the rich collection of the Hon. W. Rothschild, and 

 am struck with the resemblance of one or two examples of P. Dohertyi with the latter. 



ADDITIONAL BIBLIOGRAPHY— Since the above was in Type. 



Papilio Yordermani, Snellen, " Tijdschr. v. Ent." XXXVII., p. 191 (June 1895), from Talaut. 

 Troides Dohertyi, Rothschild, " Novitates Zoologicae," V. II., p. 227, n. 22 (1895). 

 Ornithoptera Dohertyi, W. F. Kirby, "The Bird-winged Butterflies of the East," NATURE, Vol. 51, p. 255, col. 2 (1895) 



