soHOENomus] TYRAUSTIDAE 



of veins 11 and 12 is probably a direct effect of the narrowing 

 and extension of the wings. 



Forewings with dark fuscous streak from apex 2. forficellus. 

 „ without apical streak . .1. gigantellus. 



1. S. gigantellus, Schiff. $. 23-28 mm. Forewings fuscous, 

 somewhat ochreous-mixed, sprinkled with dark fuscous; two 

 dark fuscous discal dots transversely placed ; an oblique 

 cloudy darker streak from costa before apex to disc, darker on 

 veins. Hindwings whitish ; a cloudy posterior line and termen 

 fuscous. 



5 . 38-42 mm. Forewings light ochreous-brown or yellowish- 

 brown ; posterior streak as in $ , but very indistinct. Hind- 

 wings white. 



Suffolk, Norfolk, Cambridge, York, local ; C. Europe, WC. 

 Asia to Turkestan ; 7. Larva pale yellowish, greyish-tinged ; 

 head and plate of 2 yellowish-brown : in stems of Phragmites ; 

 5, 6. 



2. S. forficellus, Thnb. 23-27 mm. Forewings very acute 

 in $ ; pale ochreous-yellowish, tinged or sprinkled with brown, 

 more strongly brownish beneath costa ; two dark fuscous discal 

 dots transversely placed, upper sometimes absent ; sometimes a 

 dark fuscous dot in disc before middle, and two or three on 

 fold ; an oblique dark fuscous streak from apex to disc. Hind- 

 wings ochrcous-whitish. 



England to York, W. and S. Ireland, rather common ; C. 

 Europe, WC. Asia to Turkestan, N. America ; 6, 7. Larva 

 greyish-green ; dorsal line dark green ; head black ; 2 with 

 black spots : in stems of Glyceria aquatica ; 5, 6. 



3. Donacaula, Meyr. 



Tongue obsolete. Antennae in $ f, in ? \. Labial palpi 

 very long, porrectcd, densely scaled, attenuated towards apex, 

 terminal joint exposed. Maxillary palpi triangularly dilated. 

 Tibial outer spurs f. Forewings: 10 out of 9, 11 sometimes 

 anastomosing with 12. Hindwings: 4 and 5 sometimes stalked. 



Contains only one European species, correlated with the 

 preceding genus. 



1 . D. mucronella, Schiff. 23 - 27 mm. Forewings brown ; 

 an ochreous- whitish costal streak, edged below with dark 

 fuscous suffusion. Hindwings fuscous-whitish. 



Kent to Berks and Lancashire, Kirkcudbright, W. Ireland, 

 local ; C. Europe, WC. Asia to Turkestan ; 7. Larva in stems 

 of Phraqmitcs ; 6. 



2o 



