402 PYRALIDINA [CATACLYSTA 



4. CATACLYSTA, Hb. 



Ocelli obsolete. Antennae . Labial palpi ascending, 

 second joint with appressed scales, terminal slender, somewhat 

 pointed. Maxillary palpi filiform. Tibial outer spurs |. 

 Forewings : 10 out of 9. 



Probably Indo- Malayan in origin, but species occur in all 

 principal regions, though only one in Europe. In exotic forms 

 veins 5 and 7 of hindwings sometimes disappear by coincidence 

 with 4 and 8 respectively. Larva aquatic. 



1. C. lemnata, L. 17-21 mm. Forewings in $ whitish, with 

 a yellowish -fuscous discal dot, traces of lines, and a pale 

 brownish terminal streak ; in $ pale brownish, ochreous-mixed, 

 with a darker discal spot, lines very indistinct, whitish, 

 darker-edged, a whitish subterminal streak. Hindwings white; 

 a dark fuscous discal dot; lines outlined with fuscous, some- 

 times nearly obsolete, first preceded by a yellow or fuscous spot 

 in disc ; subterminal and terminal ochreous lines enclosing a 

 black fascia marked with four bluish-silvery dots. 



Britain to the Clyde, Ireland, common ; C. Europe ; 6-8. 

 Larva dark green or blackish ; dorsal line black ; head pale 

 brown : in portable oval case of leaf-fragments, on Lemna ; 10-5. 



5. NYMPHULA, Schrk. 



Antennae f. Labial palpi ascending, second joint with pro- 

 jecting scales beneath, terminal slender, somewhat pointed. 

 Maxillary palpi with apex loosely scaled. Tibial outer spurs J. 

 Forewings : 10 out of 9. 



Principally Indo -Malayan, but stragglers occur in all the 

 main regions. Larva aquatic, sometimes breathing by bran- 

 chiae ; when young, mining in leaves. 



First line of hindwings strongly marked . 1. stagnata. 

 ,, ,, absent . . 2. stratiotata. 



1. N. stagnata, Don. 19-23 mm. Forewings white; costal 

 edge and sometimes a subcostal line dark fuscous ; a curved 

 dark fuscous subbasal line ; lines and transverse discal spots 

 strongly outlined with dark fuscous, sometimes partly 

 brownish, first curved, second indented below middle, connected 

 by a prolongation with discal spot and first line, lines sometimes 

 also connected on dorsum ; a yellow -ochreous dark-margined 

 terminal streak. Hindwings as forewings, but lines narrower, 

 not connected, subbasal absent, discal mark oblique, narrow, 

 dark fuscous, usually touching first line. 



