222 KHOPALOCERA. 



the wings being of a similar chalky white crossed by narrow black bands ; but the 

 resemblance is only superficial, for the arrangement of the bands is different in the two 

 forms, and P. epidaus alone has a black median band crossing the secondaries in the 

 direction of the anal angle ; the silvery edging of the tail, too, is also a diagnostic 

 character. P. epidaus, though also t found in the eastern lowlands of Mexico and 

 Guatemala, is the only one of these white species which occurs in North-western 

 Mexico and in the lowlands of Guatemala bordering on the Pacific Ocean. 



Papilio epidaus was figured, without description, in Doubleday and Hewitson's 

 ' Genera of Diurnal Lepidoptera ' from Mexican and Honduras specimens. Its southern 

 range extends to Costa Rica, for though Boisduval says it occurs in Colombia we have 

 no confirmation of this statement, and none of the collectors in the State of Panama have 

 met with it. 



52. Papilio fenochionis. (Tab. LXVlil. figg. 13, 14 s .) 



Papilio fenochionis, Salv. & Godm. Ann. & Mag. N. H. ser. 4, ii. p. 150 \ 



P. epidao similis, sed anticis magis hyalinis ; posticis dimidio distali (lunulis submarginalibus et maculis duabus 

 subanalibus coccineis exceptis) nigris ; linea mediana haud abbreviata, dimidio distali nigra conjuncta : 

 subtus posticis lineola mediana coccinea utrinque nigro limbata. 



Hah. Mexico, Oaxaca (Fenochio 2 , Hbge). 



This is a form of P. epidaus apparently confined to the State of Oaxaca on the 

 western side only. Further to the northward in the Sierra Madre of Tepic the true 

 P. epidaus is found, and also on the Pacific coast of Guatemala to the southward. Its 

 characters are fairly definite, the great extent of the black on the distal portion of the 

 secondaries and the submarginal lunules are in a single, not a double, row, though 

 indications of the inner row can be traced in some specimens. 



G-. P. thoas group. 

 Papilio, Sect, xlii.., Feld. Sp. Lep. pp. 21, 69. 



The secondaries have no fold along their inner margin, which instead of being 

 convex when fully spread is distinctly concave. The foliate appendage to the front 

 tibia is attached nearer the proximal than the distal end of that joint. The harpes are 

 of simple construction (see Tab. LXIX. fig. 4) ; the lower edge is produced to a point 

 and is slightly serrate beneath. The scaphium is strongly chitinized, and has a pair of 

 well-developed hooks, which are directed outwards and are upturned. 



The sexes are alike in coloration. 



Though P. thoas has a wide range in North America, the group to which it belongs 

 must, we think, be considered a Neotropical one, as several allied species are found only 

 in southern countries. 



