568 New Forms of Indo- Australian Butterflies 



In dioneia the dorsal process gradually widens posteriorly, and the 

 edge of the small lobe is not attached to it. 



We have some hesitation in assigning sulaensis to arsinoe and do so 

 provisionally. It may well be that this form was collected on one of 

 the Sula Islands where dioneia is not found. Unfortunately, although Mr. 

 Frost visited both Sula Mangoli and Sula Besi he mixed his captures. 



Fore wing not so falcate as in dioneia but more so than in figalea 

 Friih. ; outer margin more even than in dioneia but less so than in 

 figalea. Tail of hind wing shorter than in dioneia but not so short 

 as in figalea. Fore wing with ante- and submarginal lines as in dioneia, 

 latter line vestigial below the submedian. Post-discal black dots 

 generally more strongly marked than in dioneia. Discal line of marks 

 less straight than in dioneia, the two posterior ones outwardly curved. 



Hind wing with the ante- and submarginal lines mostly closer 

 together ; ocelli a little smaller than in dioneia ; discal line more distinct 

 and crossing the base of vein 3, in dioneia this line passes below the 

 base of this vein. 



Underside darker and more reddish than in dioneia, the distal areas 

 flushed with violet, stronger on the hind wing. Fore wing markings 

 much less defined than in dioneia and discal line more narrowly bordered 

 with paler-brown. The discal line placed farther from the cell than in 

 dioneia, more oblique, and shifted well inwards below vein 3. Hind 

 wing markings more distinct than on the fore wing, but the dark post- 

 discal line found in dioneia is here only faintly indicated. Discal line 

 narrowly bordered with grey-white, broader anteriorly ; this line more 

 sinuous than in dioneia and passing just beyond the base of vein 3 ; in 

 dioneia it passes below the base of this vein. 



Length of fore wing : 46 — 49 mm. 



Habitat. — Sula Islands, June, July, September, W. J. C. Frost, a 

 series of $ $ . 



Cynthia arsinoe aruensis subsp. nov. 



$ . Similar to the typical form but markings less distinct. Fore 

 wing with the margin and antemedial line less strongly black ; sub- 

 marginal series of spots situated more proximal ; discal line of marks 

 thinner and sharper. Basal area without black dusting. 



Hind wing submarginal spots larger and less defined ; ocelli a little 

 smaller, discal line only faintly indicated. 



Underside of fore wing with submarginal spots distinct in lc, 2, 5 

 and 6 ; discal mark in 2 curved inwards. Hind wing paler than in 



