( xxxviii ) 



nearer to Madagascar. Mayottensis indeed appears to be so 

 near to sadava that there is practically nothing but coloui- to 

 separate it. In the British Museum it is accorded subspeciiic 

 rank only. Its close affinity to sadava was pointed out by 

 Oberthiir in the original description. 



.So far as it is possible to infer from a very limited number 

 of specimens in a group where individual difference in size 

 IS strongly marked, dinnetoriim is the largest of the five 

 species, then sadava, then frohenia, while the two north- 

 western species, which appear to be about equal in size, are 

 the smallest. 



The tawny markings of the upper surface are much deeper 

 in tint in the eastern species : frohenia is in this respect 

 slightly but distinctly darker than dumetorum. Comorarioi), 

 on the other hand, is almost precisely of the .same pale tawny 

 shade as mayottensis. It may be faintly deeper in tint, Init [ 

 could not feel certain of this. The ground-colour is blackest in 

 dumetorwn : in frohenia it is of a much duller browner shade. 



In the north-western species the relative shape and propor- 

 tions of the chief markings on the upper surface are very 

 similar to each other and to the white markings of the Mada- 

 gascar sadava. In comorarum, however, the band of the hind- 

 wing is considerably narrower, and is not prolonged on to the 

 fore-wing as it is in all the other species of this group. This 

 extension on the fore- wing is largest in sadava and mayottensis, 

 smaller in dumetorum, and still smaller but quite distinct in 

 frohenia. In the eastern species the band of the hind-wing 

 is not only still narrower, but possesses, in dumetorum, a 

 markedly crenulate outer margin which gives it a very dis- 

 tinct appearance. In some individuals of frohenia, slight 

 but obvious traces of this outline are a further indication of 

 alfinity between it and dumetorum. Each crenulation occu- 

 pies an internervular space, and is concave in form. In 

 sadava, on the contiary, the outer border of the band projects 

 as more or less of a convexity into each internervular space. 

 The difference may be expressed by saying that the outer 

 margin of the band is formed of concave crenulations in 

 dumetorum, of convex crenulations in sadava. 



As regards the markings of the under surface and of the 



