400 PYRALIDINA 



20. Middle tibiae in 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 <J with scaled groove near base 



19. MICROSTEGA. 

 without groove . .24. 



24. Hindwings 1J-1J . . . 16. NOMOPHILA. 



hardly over 1 . , .18. PYRAUSTA. 



1. ACENTROPUS, Curt. 



Tongue absent. Antennae f . Labial palpi porrected, dilated 

 with rough scales towards apex. Maxillary palpi very short, 

 loosely scaled. Tibial spurs short, slender. Wings in $ some- 

 times much abbreviated. 



A very small genus, characteristic 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. Hindwings whitish. Wings in $ 

 often rudimentary, but sometimes larger than in #, up 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, Dup. 



Face tufted. Tongue very short or obsolete. Antennae in 

 c -, in $ less than J. Labial palpi very long, porrected, 

 densely scaled, attenuated towards apex, terminal joint exposed. 

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

 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 



