112 BUTTERFLIES OF BORNEO. 



species may perhaps be only a sub-species of E. gsoka, 

 Feld. from the Malay Peninsula but for the present it 

 will be advisable to keep the two forms separate. 



Euthalia ambalika, Moore was described in 1859 from 

 a female and nine years taler a male described by 

 Butler * was associated with this female but this male 

 is really the male of E. diardi. On Mt. Penrisen in 1898 

 I observed an undoubted female ambalika with a male 

 hovering round her and following her from one resting- 

 place to another, fortunately I was able to secure both 

 specimens and I have no doubt that they are the 

 opposite sexes of the same species. The male differs 

 from the male of E. vacillaria in the following points : — 

 The apex of the forewing is not falcate ; the blue border 

 of the forewings extends to near the apex of the wing 

 and internally it is deeply but narrowly notched ; the 

 patch of androconial scales is small or absent ; the 

 colour of the underside is bright ochreous. The male is 

 very variable in size and rather variable in colouration, 

 the blue band of the upperside often being tinged with 

 lilac and the underside is sometimes rather sullied the 

 markings sometimes being clear sometimes obsolete. 

 The female has no blue band on the upperside of the 

 hind-wings. E. ambalika is possibly a sub-species of E. 

 puseda, Moore from the Malay Peninsula, E. blumei Voll. 

 from Java being another. 



Euthalia diardi, Voll. was described in 1862 from a 

 female. The male is to be distinguished from the 

 corresponding sex of E. ambalika by the following 

 points : — the blue fascia of the forewing is broad and 

 extends to the apex of the wing ; the blue fascia on the 

 hind-wing is very broad ; the androconial scales are 

 reddish brown ; the underside is not bright ochreous 



* Heir Frubstorfer informs me that a specimen of what I consider 

 to be the true male of E. ambalika is identical with the co-Type of 

 E. diardi in his collection. 



Jour. Straits Branch 



