( xiv ) 



(orientalis, Tutt, and ab. bella, Gerh. 

 Asiatic . . J^ sif aniens, GrYm..-Gi'shvLi. 



Vougodai, Tutt. 



fkoreana, Tutt. — large, like bejarensis. 

 y I micrargu^, Butl. — small (without metallic 



I spots. 



\pseiulaegon, Butl. — mountain for-m. 



P. argyrognomon lias an almost exactly similar range in the 

 Palaearctic area. Its range of variation is also almost parallel 

 with that of P. argus, the lai'ge eastern race from Japan 

 equalling the var. koreana in size. The Corsican forms of the 

 two species, much alike on the upperside, are very distinct on 

 the underside ; P. argyrognomon var. Corsica with black- 

 centred ocellated spots, P. argus var. Corsica with the centres 

 grey or pale brown (wing of the ground colour). The Alpine 

 race too is smaller, the southern races larger, so that both 

 species appear to show a parallel range of variation in the 

 mountain, plain and southern forms respectively. Structur- 

 ally and superficially considered the two species present 

 several marked dilferences. For instance {a) in argyrognoinon 

 the spine on the front tibia is absent : (6) the shape of the 

 wings in argus is more rounded) : (c) the wing-fringes wider : 

 (d) in argas the ground colour of the undersides is pale to 

 white, in argyrognomon the colour is more uniformly grey: (e) 

 there is a difference in the angulation of the row of transverse 

 spots on the underside of the forewings, those of argus being 

 more curved under the discoidal lunule : {f) the androconia 

 in a.rgus are elongated (8 to 9 rows of points run across each), 

 in argyrognomon they are rounded (10 to 12 rows of points) ; 

 {g) the conspicuous white hair scales in argyrognomon are 

 absent in argus : (h) the genitalia show marked differences 

 in both species : and lastly {j) the early stages, and life-history, 

 are entirely different, and whereas argyrognomon has two 

 broods in the year, argus has only one. 



Dr. T. A, Chapman then showed lantern slides of prepara- 

 tions of the larvae at their various instars of P. argus (aegon), 

 and of the first stage of argyrognovion also, for comparison, 

 and of various points in the larval and pvipal external 



