436 



PYRALIDINA 



[PTEROPHORTIS 



2. Forewings with black discal dot at J 4. galactodactylus. 



without discal dot at J 5. spilodactylus. 



3. Costal cilia of forewings wholly white 3. pentadactylus. 



not wholly white . 4. 



4. Costal cilia of forewings wholly dark fuscous 



1. tetradactylus. 

 not wholly dark fuscous 



2. baliodactylus. 



1. P. tetradactylus, L. 16-22 mm. Forewings yellow- 



whitish; costa more or less 

 broadly suffused with fuscous, 

 posteriorly becoming a very 

 slender dark fuscous costal 

 streak; sometimes a subcostal 

 whitish line towards base; costal 

 cilia wholly dark fuscous, rest 

 fuscous. Hindwings dark grey, 

 segments whitish towards tips. 

 Britain to Caledonian Canal, 



JS^Uon otPteropHorusspiMactylus. ^ ^^ ^^ (jommon . 



Europe, Asia Minor; 6-8. Larva green; dorsal line broad, 

 darker, whitish- edged ; subdorsal darker; spiracular grey- 

 yellowish ; head yellowish-green : on Thymus ; 5, 6. 



2. P. baliodactylus, Z. 19-25 mm. Forewings whitish- 

 ochreous or pale yellowish-ochreous ; a dark fuscous mark in 

 costal cilia beyond middle, costal edge from base to this very 

 finely dark fuscous mixed with whitish; a fuscous costal 

 suffusion from near this to near apex; cilia towards tips of 

 both segments becoming yellow - whitish above, dark grey 

 beneath. Hindwings grey, paler and ochreous-tinged towards 

 tips of segments. 



S. England to Gloucester and Oxford ; C. and S. Europe, 

 Asia Minor ; 7, 8. Larva dull green ; dprsal line and incisions 

 more yellowish ; head yellowish-green : on Origanum ; 6. 



3. P. pentadactylus, L. 26-29 mrn. Forewings and hind- 

 wings wholly white, with a few blackish scales. 



England, E. and S. Ireland, common ; Europe, N. and WC. 

 Asia ; 6, 7. Larva green : dorsal area yellow, enclosing a series 

 of green blotches ; spiracular whitish posteriorly ; head yellow- 

 brown : on Convolvulus ; 8-5. 



4. P. galactodactylus, lib. 20-25 mm. Forewings yellow- 

 ish-white, with a few blackish scales ; a blackish dot in disc at 

 J, two transversely placed before fissure, one on costa at f , two 



