1885. J LEPIDOPTERA FROM SOMALI-LAND. 767 



Papilionid^. 



29. Terias zoe. 



Terias zoe, Hopffer, Ber. Verb. Ak. Berl. 1855, p. 640, n. 5 ; 

 Peters' Reise n. Mossamb., Zool. v, p. 369, pi. 23. figs. 10, 11 

 (1862). 



One male. — Thrupp. 



30. Teracolus dynamene. 



Pontia dynamene, Klug, Symb. Phys. pi. 6. figs. 15, 16 (1829). 



Var.? Teracolus carnifer, Butler, P. Z. S. 18/6, p. 138, u. 42, 

 pi. vii. figs. 8, 9. 



One male of eacb form. — Thrupp. 



M. Mabille has recently figured as the female of this species 

 (which I am satisfied is not found in Madagascar) that sex of 

 Staudinger's recently named Madagascar species T. castalis, placed 

 by the latter author in the obsolete genus Idmais. Dr. Staudinger 

 is frequently at fault in his generic identifications, though most often 

 his error consists in associating genera utterly different in structure, 

 and whose chief resemblance is one of external facies (as is the case 

 with Amynthia clorinde, described and figured in Dr. Staudinger's 

 very pretty book as a Gonepteryx), whereas the three groups Idmais. 

 Callosune, and Teracolus, which, from insufficient material, Dr, 

 Staudinger believes to be distinct genera, do not exhibit a single 

 structural distinction, and, not only that, our collection of these 

 butterflies, which is beyond all question by far the most perfect in the 

 world, shows an almost complete transition, through numbers of 

 nearly allied local forms, from the most Colias-like Idmais-form to 

 the extreniest type of Callosune-iorm almost resembling a Leptidia. 

 It is easy to figure selected species and to say that they are members 

 of different genera ; it is just as easy to assert without evidence that 

 intermediate forms have been described from single specimens and 

 therefore may be ignored ; but facts remain as they were, — genera 

 founded on good structural characters will alone stand. 



31. Teracolus ocellatus, sp. n. 



S . Exactly intermediate between T. protractus and T. phisadia : 

 primaries only differing from the latter in the straight inner edge to 

 the blue-grey basal area, which agrees with that of T. protractus, 

 and in the distinctly white-pupilled black spot at the end of the cell; 

 secondaries like T. protractus, excepting that the abdominal half from 

 the base to the border is white as in T. phisadia : on the under sur- 

 face the wings are almost exactly as in the latter species. Expanse 

 of wings 39 millim. 



One male. — Thrupp. 



This is one of the most interesting species in the collection, since 

 it is exactly intermediate between the salmon-coloured T. protractus 

 and the salmon and white T. phisadia. I have long been looking 

 out for this intergrade, as I was satisfied that it must exist ; I have 

 also no doubt that a species intermediate between T. phisadia and 



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