Mr. A. O. Walker on Phcrusa fucic<jla, Leach. 81 



brownish stramineous, with a small brownish-black spot on 

 the upper discocellular nervulc and a row of three indistinct 

 minute brown spots across tiie disk in the interspaces between 

 tiic median uervules; costa at the base pale orange, outer 

 margin white. 



K\})aiise ot" wings 1| inches. 



//«/>. Mahobo. 



The male is very near mahtlla^ but the female shows that 

 it is distinct. 



L ihij th ea ts ian dava. 



Male. — Upperside. Anterior wings resemble thoseof L.laius, 

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

 rupted and wider than in lai'us, and the subovate discal spot, 

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

 the posterior wings it also resembles lams, but the small 

 ochreous spot of laiiis above the second subcostal nervule is 

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

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

 instead of the first, as in /aius. 



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 whole of the 

 central area of the wings. 



Expanse of wings If inch. 



ilab. Mahobo. 



IX. — 0)1 Pherusa fucicola. Leach. 

 By Alfred O. Walker. 



7o 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 insufficient, but positively misleading. 



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



