DERTHI8A. 229 



Genus DERTHISA. 



Type. 

 Derthisa, Wlk. xi. 524 (1857) scoriacea. 



Proboscis absent ; palpi obliquely upturned, the second joint fringed with 

 long hair in front, the third short, porrect ; frons with rounded prominence, 

 roughened in front ; eyes large, rounded ; antennas of male bipectiuate with 

 rather long branches to apex, of female nearly simple ; head and thorax clothed 

 with hair and hair-like scales, the pro- and metathorax with spreading crests ; 

 tibiffi fringed with long hair ; pectus hairy ; abdomen with dorsal crest on 

 basal segment. Fore wing with the apex rectangular, the terraen obliquely 

 curved and slightly crenulate ; reins 3 and 5 from near angle of cell ; 6 from 

 upper angle ; 9 from 10 anasLomosing with 8 to form the areole ; 11 from cell. 

 Hind wing with veins 3, 4 from angle of cell ; 5 obsolescent from middle of 

 discocellulars ; 6, 7 shortly stalked ; 8 anastomosing with the cell near base 

 only. 



A. Fore wing with the orbicular confluent with a mark below 

 cell. 



a. Fore wing with the orbicular constricted at middle sarepiana. 



b. Fore wing with the orbicular not constricted at middle. 

 a^. Fore wing with the lower extremity of reniform 



expanding irimacula. 



b^. Fore wing with the reniform oblique, not expanding at 

 lower extremity. 



a^. Hind wing more or less tinged with brown lederi. 



6*. Hind wing wholly wliite amasina. 



IS. Fore wing without mark below orbicular.' 



a. Fore wing with the orbicular triangular antherici. 



b. Fore wing with the orbicular round. 



a}. Hind wing white scoriacea. 



b^. Hind wing more or less completely suffused with 



brown corsaco vi. ' 



2377. Derthisa sareptana. (Plate CII. fig. 1.) 



Episema sareptana, Alph. Eom. Mem. ix. p. 213 (18S7); Stand. Cat. Lep. 

 pal. p. 177. 



J . Head and thorax dark brown mixed with grey ; palpi red- 

 brown at sides, the end of 2nd joint white ; pectus and base of legs 

 whitish ; tarsi fringed with white ; abdomen gre3'-brown, the 

 ventral surface whitish. Fore wing reddish brown mixed with 

 gre}' and irrorated with black ; subbasal line represented by black 

 striae from costa and cell ; antemedial line black defined by greyish 

 on inner side, oblique, sinuous ; orbicular and reniform greyish 

 defined by black at sides, open above and below, irregular, rather 

 constricted at middle and extending to below cell, the cell before 

 and between them deeper brown ; postmedial line black defined by 

 greyish on outer side, oblique towards costa, then dentate, angled 

 outwards at veins 6 and 4, then incurved ; subterminal line very 

 indistinct, pale, waved, slightly defined by brown on inner side and 

 with more distinct patches at costa and submedian fold ; a terminal 

 series of small black lunules ; cilia chequered brown and greyish. 

 Hind wing whitish nearly uniformly suffused with brown ; the 

 underside uniform brownish white. 



Hab. S. Russia, Sarepta, 1 6 . J^x^. 32 millim. 



