400 PYRALIDINA 



20. Middle tibiae in S dilated . . 20. Mecyna. 



,, „ „ normal . 25. Mesographe. 



21. Maxillary palpi nearly equal to labial 24. Evergestis. 



,, ,, much shorter than labial . . 22. 



22. Terminal joint of labial palpi exposed . 7. Diasemia. 



„ ,, ,, „ concealed in scales 



of second . . 23. 



23. Forewings in S with scaled groove near base 



19. MiCROSTEGA. 



,, ,, without groove . . 24. 



24. Hind wings IJ-li . . . 16. Nomophila. 



„ hardly over 1 . . .18. Pyrausta. 



1. ACENTROPUS, Curt. 



Tongue absent. Antennae ^. Labial palpi porrected, dilated 

 with rough scales towards apex. Maxillary palpi very short, 

 loosely scaled. Tibial sjDurs short, slender. Wings in 5 some- 

 times much abbreviated. 



A very small genus, chai'acteristic of Europe ; the species 

 are probably much overlooked. There is no affinity whatever 

 in structure with the Trichoptera (caddis -flies), as was once 

 vaguely imagined. Larva aquatic. 



1. A. niveus, 01. 12-16 mm. Forewings whitish, veins and 

 costa obscurely brownish. Hind wings whitish. Wings in 9 

 often rudimentary, but sometimes larger than in S, np to 

 23 mm. 



Britain to Caledonian Canal, N. Ireland, local ; C. Europe ; 

 6-8. Larva light olive-green ; head light brown : between spun 

 leaves of Potamogeton ; 9-7. The development of the wings of 

 the ? appears to vary considerably, but under what circum- 

 stances is still uncertain. 



2. SCHOENOBIUS, Dvjx 



Face tufted. Tongue very short or obsolete. Antennae in 

 S -fj in $ less than ^. Labial palpi very long, porrected, 

 densely scaled, attenuated towards apex, terminal joint exposed. 

 Maxillary palpi triangularly dilated. Tibial outer spurs ^-^. 

 Forewings: 11 sometimes anastomosing with 12. 



A small but cosmopolitan group, derived from Hydrocampa. 

 The resemblance in form and colour to Chilo is due to analogy ; 

 there is no real relationship. The superficial characters of both 

 are suited to their reed-frequenting habit (compare the reed- 

 dwelling species of Caradrinidae) ; the tendency to anastomosis 



