Mr. A. 0. Walker on Pherusa fucicola, Leach, 81 



brownish stramineous, with a small brownish-black spot on 

 the upper discocellular nervule and a row of three indistinct 

 minute brown spots across the disk in the interspaces between 

 the median nervules j costa at the base pale orange, outer 

 margin white. 



Expanse of wings 1^ inches. 



Hab. Mahobo. 



The male is very near mabel/a, but the female shows that 

 it is distinct. 



Libythea tsiandava. 



Male. — Upjoerside. Anterior wings resemble thoseof L.laius^ 

 Trimen, but the fulvous longitudinal bar in the cell is uninter- 

 rupted and wider than in laius^ and the subovate discal spot, 

 which is traversed by the second median nervule, is larger. On 

 the posterior wings it also resembles laius^ but the small 

 ochreous spot of laius above the second subcostal nervule is 

 absent, and in the straight longitudinal bar of four con- 

 tiguous spots beyond the middle the second spot is the largest, 

 instead of the first, as in laius. 



On the underside it is paler and browner than laius^ and on 

 the anterior wings the pale fulvous colouring of the bar and 

 spots extends below the cell and over nearly the \v^hole of the 

 central area of the wings. 



Expanse of wings If inch. 



Hab. Mahobo. 



IX. — On Pherusa fucicola. Leach. 

 By Alfred O. Walker. 



To the Editors of the Annals and Magazine of Natural 

 History. 



Gentlemen, — The fact that a principle of considerable 

 importance in zoological nomenclature is involved must be 

 my excuse for troubling you again on the above question. 

 Either No. 11 of Strickland's Rules for Zoological Nomen- 

 clature, adopted and confirmed by strong committees of the 

 British Association, should be observed, or it should be con- 

 demned as authoritatively as it was accepted ; and if it is 

 ever to be observed, it surely should be in such a case as this, 

 where the original definition of both genus and species is not 

 only insufticient, but positively misleading. 

 Ann. & Mag. N, Hist. Ser. 6. Vol. viii. 6 



