of the Amazon Valley. 223 



naming every well-marked local variety, referring it, however, to its 

 supposed parent form wherever the evidence was sufficient to warrant 

 it. The same comparisons and inferences, however, which are usually 

 applied to affiliate local forms and varieties, I consider it logical and 

 necessary to apply to reputed species. Discussions upon the deriva- 

 tion and relationship of local varieties are of great scientific interest ; 

 but they only reach their true value when they are applied also to 

 the apparently more distinct forms. It is not, I conceive, according 

 to the spirit of inductive science that the method which is applied to 

 prove the natural derivation of a semi-distinct form should be re- 

 linquished on the incorporation of the variety with the species. 



Family Papilionidae. 

 Subfamily Papilionin-e. 

 Genus Papilio, Authors*. 

 1. P. Crassus, Cramer. 

 P. Crassits, Cram. 112c. 

 Upper Amazons and Para. Found throughout Brazil and Guiana, 

 as far south as Kio Janeiro, without modification ; in Venezuela it 

 presents a well-marked local form, P. Lepidus, Felder (Lep. Nov. 

 Columbise, no. 1). 



2. P. Belus, Cram. 

 J. P. Belus, Cram. 112 a. b. 

 Upper Amazons ; appears to be confined to this region and Guiana. 



3. P. Varus, Kollar. 



2 . P. Varus, Koll. Beitr. Ins. Fauna von N. Granada, t. 1. f. 3, 4. 

 Upper Amazons. Probably the $ of P. Belus. 



4. P. Nwmitor, Cram. 

 P. Numitor, Cram. 113 b. 



Para ; also Guiana and Venezuela. I consider it to be a local form 

 of P. Belus. 



5. P. Lycidas, Cram. 

 2 . P. Lycidas, Cram. 113 a. 



cj. P. Erymanthus, Cram. 113 C. 



Upper Amazons and Para ; also Guiana : not found, or any form 

 nearly resembling it, in any other part of Tropical America, to my 



* The natural history and synonymy of the Amazonian species of Papilio I 

 have given in greater detail in the Trans. Ent. Soc. vol. v., n. s., " Contributions 

 to an Insect Fauna of the Amazon Valley : genus Papilio." 



VOL. I. s 



