398 Revision of the Genus Teracolus, Swains. 



this species and, in a less deg-ree (sometimes), to T.imperator^ 

 and the single costal spot, which Godart does not specially 

 mention^, may easily have been reckoned by him as one of 

 these marginal spots. Lastly, the white colouring of the 

 under surface, upon which stress has been laid, is really of 

 very little importance, for worn examples, or such as had 

 been long on the wing, would show little if any yellow 

 tinting. There is no accounting for the presence of many of 

 the rare species which found their way into the collections of 

 the older authors, often not lo reappear for a hundred years 

 or longer. As regards the argument as to Boisduval having 

 seen M. Godart's type, it is evident, from what Mr. Trimen 

 says, that the late Doctor confounded all the purple-tipped 

 Teracoli together *. T. johina is tlie dry-season form of the 

 species, and the description was based upon four examples in 

 the collection of Mr. Druce from Natal. These subsequently 

 came into the possession of Messrs. Godman and Salvin, 

 whose series of eleven specimens (inclusive of the above) is 

 now in the ]\Iuseum collection. An intermediate season form 

 long represented T. johina in the Museum, but three specimens 

 in the Hewitson collection are typical. 



24. Teracolus hacclius. 



Teracolus hacchus, Butler, P. Z. S. 1888, p. 73 ; Grose Smith and 



Kirby, Rhop. Exot. i., Call. pi. i. figs. 1-4 (1889). 

 Callosune mrogoana, Vieillot, Bull. Soc. Eut. Fiance, 1891, pp. ci and 



cxv. 



Eanges from Lado, north of the Albert Nyanza, south- 

 wards to Mamboia and the Nguru hills, and eastwards to 

 Kilima-njaro. 



The wet-season form is characterized as distinct from 

 T. imperaior by its inferior size, the heavy black veining on 

 both surfaces, the well-defined grey internervular spots on 

 the apical border of the primaries in the male, and the rudi- 

 mentary character of the transverse band on the under surface 

 of the secondaries in tliat sex ; it possesses also two forms of 

 female, as is the case with T. ione. Tiie dry-season male is 

 somewhat larger, with the black veins much less defined 

 above and almost or altogether wanting below, the black 

 marginal spots also wanting on the upper surface of the 



« This has heen further proved by Mons. Dognin, who has kindly 

 examined the original examples for nie, but has been unable to decide 

 which is the type of M. Godart's description, or even if it still exists iu 

 the series. 



