326 Mr. A. G. Butler on the 



dash, and separated from the greyish testaceous postdiscoidal 

 patch by a slender trisinuated white line ; the form of 

 the postdiscoidal patch is like that of 31. perpendicularis^ 

 and (as in that species) a very irregular slender black 

 line runs round its outer edge inwards along the little 

 grey connecting bar and outwards along the edge of the 

 ochreous belt ; the small quadrate patch wifhin the cell 

 enclosed between the anterior portion of the ochreous belt and 

 the reniform spot is dull reddish clay-coloured ; the irregular 

 interval (tapering from costa) between the postdiscoidal patch 

 and the external area is grey varied towards costa with clay- 

 colour and bounded externally with blackish ; the external 

 area itself is formed as in M. perpendicuJaris^ is whity brown 

 clouded externally and obliquely streaked at apex with grey; 

 the fringe is pale buff, traversed by two imperfect wide grey 

 stripes : secondaries with the basiabdominal third greyish 

 white, silvery opaline towards costa, dusky at base of median 

 branches ; centre of wing from costa to near anal angle occu- 

 pied by a semitransparent decreasing white belt, slightly 

 tinted at its extremities and on the centre of the interrupting 

 nervures with buff; apical area and external border deep 

 bronze-brown ; the nervures as they pass from the central 

 white belt on to the brown area being blackish, so as to form 

 short streaks ; a blackish spot at centre of outer margin, 

 bounded on each side by pale ochreous marginal spots, a tliird 

 pale ochreous spot at apex ; fringe white, more or less tinted 

 with grey-brown opposite to the intervals between the 

 ochreous spots : body grey, decreasing in intensity from the 

 head backwards, the anal tuft being almost white ; below 

 whitish. Under surface of wings very sirnilar to that of 

 M. hisinuata, but much whiter, and with the brown areas 

 paler and more restricted ; the wliite belt of the secondaries 

 as above (not irregularly curved as in 31. hisinuata) and with 

 no trace of the black discocellular spot or blackish streaks at 

 the base of the median branches and radial vein. 



Expanse of wings o8 millim. 



Two examples. Callao {J. J. Walker). Type in B. M. 



I have named this pretty little species in honour of its 

 indefatigable collector, to whose zeal and patriotism the 

 ]\luseuni is indebted for many rare and beautiful new species. 



It is rather difhcult to decide upon the best position in the 

 genus for 31. Walkeri, since it combines characters found in 

 31. ochrodes, perpendicular is , and hisinuata ; I think perhaps 

 it will stand most naturally next to the last of these three. 



