P. E. S. WHALLEY 



amined but some extreme cases occurred. In E. inops two colour phases were 

 found, a white one with narrow brown reticulations and a brown one with slightly 

 darker brown reticulations. Other aspects of their morphology were similar and 

 some intermediates were found although the two extremes were very different in 

 appearance. The wing venation varies relatively little throughout all African 

 species (Text-figs 7-8). In the fore wing twelve veins (considering lA and iA 

 which are often completely or partially fused, as one vein) are always present with, 

 in some species, fusion near their origin from the cell of radial veins, R 2 to R 5 . In 

 only one specimen of one species (P. stratified) was an abnormal condition detected 

 where one fore wing vein was missing from one side. Rarely three of the radials 

 fuse for part of their length (Epaena), more frequently only two of them join 

 (Lelymena, Cumbaya) but in most genera R 2 to R 5 arise from the cell. There is 

 some variation in the origin of lA and 2A and in particular the relative lengths of 

 these veins. In Lelymena some variation in the venation occurs in single specimens 

 between the left and right sides but this is exceptional. While there is some intra- 

 specific variation in the origin of R 2 to R 5< in the majority of species the wing vena- 

 tion is constant intra-specifically. The hind wing venation shows little variation 



Fig. 8. Wing venation. Stviglina guttistigma Hampson. 



