B utter fiies from British North Borneo. 427 



Posterior wings with the veins from the base to near the 

 submarginal row of spots broadly black ; the cell is crossed 

 from near the middle of the subcostal nervure to near the end 

 of the median nervure by a broad black line ; between the 

 uppermost and middle median nervules, at their junction with 

 the median nervure below the cell, is a large oval black spot ; 

 the broad black streaks along the lowest median nervule and 

 the submedian nervure curve towards and join each other at 

 their outer end, forming a loop ; there is a submarginal row 

 of six subconical spots, that nearest the costal margin the 

 longest and largest, the spot nearest the anal angle rectangular; 

 at the anal angle is an irregular subcaudate black bar, sur- 

 mounted by a pale yellowish space, above which is a narrow 

 black line ; the ends of the veins are broadly tipped with 

 greyish-black markings, which join each other and form an 

 irregular grey band on the margin, which is emarginate. 



The underside resembles the upperside, but the marginal 

 spots are smaller and not connected with each other. 



liho. female resembles the male. 



Expanse of wings 4^ inches. 



Hah. Pingas and Penungah, North-east Borneo. 



This remarkable butterfly, which is named after its captor, 

 is intermediate between P. idmoides^ Hevvitson, and F. Deles- 

 sertii^ Guerin. 



Appias flavius. 



Male. — Upperside. Eesembles A. nero^ Fabr., but is more 

 yellowish orange, the veins are the same colour as the wings, 

 not black as in A. nero, nor is there any dusky shading 

 towards the margins. 



Underside. Anterior wings paler, and posterior wings 

 yellower than on the upperside. The dusky indistinct sub- 

 marginal bands which cross the disk of both wings of A. nero 

 are absent on the anterior wings, and on the posterior wings 

 are represented by a dusky patcli beyond the cell. 



Female. — Upperside. Both wings paler yellowish orange 

 than in the same sex of A. nero. On the anterior wings the 

 discocellular nervules, and the median nervure from the base to 

 its junction with the lowest median nervule are narrowly 

 black, all the rest of the veins in the centre of the wings being 

 flavous ; the sinuate dark band which crosses the disk of 

 the female nero is in A. flavius narrower, and not interrupted 

 between the lowest median nervule and the submedian 

 nervure; the space towards the base of both wings which is 

 irrorated with dusky scales is more restricted than in the 

 female nero. 



