to an Insect Fauna of the Amazon Valley. 343 



species occur together over a wide district on the frontiers of their respective 

 regions without araalgamating or showin;^ any intermediate forms. In some cases 

 the differences between the two are much more strongly marked than in others; 

 and then we must seek for other causes of tlieir origin than llie operation of local 

 conditions on one and the same species in distant points of its present c-rea of 

 distribution. 



P. Triopas, Godt. Encyc, Meth. ix. p. 33, No. 23. 



This is another species of confined range. It occurs only in Guiana, at Pard and 

 on the Lower Amazon. I found it chiefly at Para and Obydos. It has been gene- 

 rally placed in classifications far away from tiie present group, but an examination 

 of its antennae and the abdominal fold of ilie $ will show at once that this is its 

 right position. Indeed, tliis and tlie following, I look upon as the culmination of 

 the type of the group. In a gioup of the Pap'Uio genus, where the effects of a 

 confined forest habitat are seen in many points of structure, as well as in the 

 enfeebled powers of flight, these two species show these characteiistics to a greater 

 extent than any of their con^ieners. 'The female flies near the ground and very 

 slowly, but the male takes a higher and rather bolder flight. 



P. Chabrias, Hewits. Tr. Ent. Soc. 1852, pi. 6, f. 1, ? . 



The $ has not been figured. It agrees in colour and markings with the 5 . 

 It is found exclusively on the Upper Amazons, where no example of P. Triopas 

 has occurred, and I consider it a geographical modification or sub species of the 

 latter, in thesame way as P. Bolivar is of P. x^neas. 



P. Orellana $ , Hewits. Tr. Ent. Soc. 1S52, p. 24, pi. 0, f. 2. 



This most beautiful and distinct species has the same glossy steel black ground 

 colour of the wings as P. Panthonus, Cr. The latter, however, has a rose-coloured 

 fringe, whilst the example of P. Orellana has, although it is scanty and obscure, a 

 white fringe. It is, therefore, a species which has no near ally in any part of 

 tropical America. I found only one individual during a four years' slay iu the 

 district, at Ega, on the slopes of a luxuriant ravine iu the forest, flying in company 

 with P. Sesitstris and P. Lysander. 



Section 2. Fringe of the wings rose-coloured. 



P. Jglaope $ , Gray, Cat. B.M. p. 00, pi. 10, f. 5, $ . 



The 2 would be similar to the fig. b', pi. 10, of Gray, if the fringe were rose- 

 coloured instead of white; but I have not seen any J which I could refer to this 

 species. The $ is nearly allied to P. Enristens, Cr. (t. 29 F.), and to P. Pan- 

 thonus, Cr. (278 CD.); all thiee belonging to the rarest of neo-tropical Pa- 

 piliones. Aglaope was taken at Para ; 1 have only seen two examples of it, one 

 in the B. M. Collection, and one in my own. 



P. Lijsander $ , Cram. t. 29 C. D. {Lysander). 



— Eurymas, Godt. and Boisduval. 



— Gray, Cat. B. M. p. 53, pi. 8, f. 7 (as 



(? of Brissonius, Hiibn., the fringe 

 white, by error of colouristj. 

 $ , Cram, 386 C. D. (as Arhatcs). 



— Hiibn. Samml. (as Arbates). 



— Boisd. Sp. Gen. Pap. No. 118, part 



(as 2 of Panthonus). 



— Godt. Encyc. ix. Pap. No. 31 (as 



Anchises, L.). 



