( 603 ) 



NYMPHALIDAE. 

 3. Isodema formosanum sp. nov. (Fig. 1). 



The geuus Uodema is distinguishable from PenthcnM by the following characters: 

 Both the fore- and hiudwing are mnch more rounded; D- of the liindwing is as Ion" 

 as, or only slightly shorter than, D'; the patch of triangular scales at the base 

 of the internal margin of the forewing below extends beyond SM- (while in Penthenm 

 it is anteriorly limited by that vein); and the second joint of the palpi is shorter 

 and more hairy. 



The species 'described below resembles in pattern very closely the ordinary 

 streaked forms ui PeHthema, but agrees in the above characters with Isodema. 



S. Body above and below olivaceous black; head with four, pronotnm witli two 

 white dots, a white spot behind eye; first and second joints of jialpi white above, 

 abdomen with a white line at eacli side below; tips of coxae and external side of 

 femora with some white scales. 



WInys, npiierside, brownish black, streaked and spotted white. For^ 



wing : cell with four patches, two near base, two (larger) near apex; a series of 



Fii;. 1. 



seven discul streaks, the two posterior ones the longest, no streak behind SM-; seven 

 postdiscal spots, more or less rounded, the upper one obscure, the last (M- — iSM°J 

 fused with the discal streak; seven submarginal spots, slightly smaller than the 

 postdiscal ones, the submarginal spot M- — SM'' somewhat W-shaped; fringe white 



between veins. Hindwiug: cell nearly all white; discal streak (.' — S!\I-' obscure 



or absent, following eight nearly as in Penthenm limrrla, but inter.^iiaces broader 

 black, and three last ones shaded with black; postdiscal and submarginal spots 

 as in P. lisarda, but the latter sinnate outwardly as in Isodema adelnui; fringe 

 white between veins. 



Underside paler brown, especially the hindwiug. Forewing: streaks and 



spots as above, but slightly larger; last submarginal spots more or less angle-shaped 



as in I. adelma. Hindwiug: spots and streaks much reduced, except submarginal 



ones, which are somewhat larger than above. 



Length forewing, costal margin 44 mm., internal margin 31 mm. 

 „ hindwing, „ -'H „ „ ^9 „ 



Hub. Taipeh to Kuchu, July IslKi (.Jonas), 'i i 6 . 



The second specimen has the white markings more reduced than the type. 



