1.^2 JOURNAL, BO^rn AY NATURAL HISTORY SOCIETY, Vol. XII. 



The rcmerkable aberration or " sport " here figured was taken 

 in Sikkim, and lias been kindly lent to me by Mr. Paul Mowis,-of Dar- 

 jillng. From typical specimens of the species from the same region it 

 differs in the shape of the forewing, wliich has the outer margin fronn 

 the lowest discoidal uervule to the apes produced and truncated, and 

 the neuration is highly abnormal, not being even the same on both 

 wings ; the left-hand wing has five instead of the normal two discoidal 

 nervules, nuinbei*s one, three, four, and five counting from behind 

 forwards arising from the disco-cellular nervules, and number two 

 arising from number ane close to its base ; in addition to this, numbers- 

 three and five give off anteriorly near the middle a sliort spur or 

 additional veinlet ; the subcostal nervure instead of reaching the outi^r 

 margin of the wing just below the apex of the wing stops short a little 

 before reaching the outer margin ; lastly the discoidal cell is abnormally 

 broad outwardly, with several additional disco-oellular nervnles closing 

 it, from which spring two (instead of the normal one) spure running a. 

 short distance into the ceil ; the right-hand wing also has five discoidal 

 nervules, but they differ froui those in the opposite wing, in that number 

 five does not give off a spur, while number three instead of giving off a. 

 spur anteriorly does so posteriorly, which spur at its apex bifurcates and 

 is continued a short distance right and left at right-angles^ to its basal 

 portion ; the subcostal nervure is the same as in the opposite wing, its 

 terminal portion ( often called the fifth subcostal nervule) not reaching 

 the outer margin. The left-hand hindwing (when the specimen is 

 turned once) is abnormal, as it has two instead of one discoidal nervules, 

 and the discoidal cell is unusually broad ; the right-hand wing also 

 possesses this extra veinlet, but in addition it gives off anteriorly a third 

 discoidal nervule. The markings also are abnormal, the forewings 

 on the upperside having each six bluish-white spots beyond the- 

 discoidal cell instead of three, the three additional spots owing their 

 existence to the presence of three additional internenndar interspaces, 

 there being three extra discoidal nervules ; these spots all reappear on 

 the underside of the wings, l)ut are as usual much smaller than on the 

 upperside. The hind wings on the upperside are normal ; but on the 

 underside the discoidal cell bears outwardly four bluish- white dashes ; 

 normally there is one or at most two such markings ; the submarginaL, 

 marginal, and di-cal series of dots and streaks are also more numerous- 



