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Show 96 MR. A. G. BUTLER ON N E W [Feb. 7, that probably long extinct type; but to associate, as one, all the species or half the species now 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.ENIA ITERATA, sp. n. Nearest to H. melanarge of Somali-land, but constantly considerably larger, the white marginal spots of secondaries larger, the subbasal black belt broader. Expanse of wings 55 millim. Kilima-njaro (F. J. Jackson). Although the distinction between this form and IL. melanarge is chiefly one of size (the latter expanding only 44 millim.) the constancy of this character in m y 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 subapical 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 62-71 millim. o*. Taveta, 2000-3000 feet, in dense forest (H. H. Johnston); 3 , 2 . Forests of Taveta (Bishop Hannington); Kilima-njaro (F. J. Jackson). 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 • |