96 MR. A. G. BUTLER ON NEW [Feb. 7, 



that probably long extinct type ; but to associate, as one, all the 

 species or half the species uow existing, is to hinder the study of 

 the genus. Those Lepidopterists who, professing to believe in 

 evolution, practically deny its existence, inasmuch as they associate 

 nearly all allied forms under one specific name, are constantly 

 getting into difficulties ; so much perplexed are they as to whether 

 they shall call a new form a " species " or a " variety," that they 

 will even speak of it as "more or less synonymous " with something 

 previously described. 



8. Herp^nia iterata, sp. n. 



Nearest to H. melanarge of Somali-land, but constantly con- 

 siderably larger, the white marginal spots of secondaries larger, the 

 subbasal black belt broader. Expanse of wings 55 miUim. 



Kilima-njaro {F. J. Jackson). 



Although the distinction between this form and H. melanarge is 

 chiefly one of size (the latter expanding only 44 millim.) the 

 constancy of this character in my opinion constitutes it a separate 

 species and entitles it to a name of its own. 



Mr. Jackson obtained Nepheronia argia, the male in every 

 respect identical with examples from Sierra Leone, the female 

 nearest to the variety named N. poppea, but differing above as 

 follows: — the patch at base of primaries vermilion-red; the outer 

 border narrower and enclosing a large white snbapical spot ; the 

 secondaries with five somewhat diffused marginal dark brown spots. 



I may be deemed inconsistent for not naming the foregoing form ; 

 but as only one example has come to hand, and the females of N. 

 argia are known to be extremely variable, I do not believe that I 

 have anything before me but an individual sport (i. e. a variety). 



Dr. Boisduval, after describing the yellow female under the name 

 of Pieris idotea, concludes by saying — *' Nous n'avons pas vu la 

 femelle." 



9. Eronia dilatata, sp. n. 



Nearly allied to E. cleodora, the apical area of primaries above 

 always marked with two and sometimes with three white spots ; 

 secondaries almost invariably with a broader external border, often 

 twice the width of that of E. cleodora ; below, the yellow patch on 

 the apical area of primaries and the ground-colour of the secondaries 

 are paler than in E. cleodora, lemon-yellow instead of saffron ; the 

 outer border of secondaries is invariably much wider, and the other 

 markings are comparatively shorter and broader than in the southern 

 form. Expanse of wings 62-/1 millim. 



S . Taveta, 2000-3000 feet, in dense forest (//. H. Johnston) ; d , 

 2 . Forests of Taveta {Bishop Hannington) ; Kilima-njaro {F. J. 

 Jaclcson). 



As will be seen from the above description, the only satisfactory 

 distinguishing characters in E. dilatata are the different yellow 

 colour and much wider border to secondaries on the under surface ; 



