436 



PYRALIDINA 



[PTEROPHORUS 



2. 



Forewings with black discal dot at ^ 

 without discal dot at \ 



1. P. tetradactylus, L. 



Neuration of Pterophorus spilodactylus. 



4. galactodactyhis. 



5. spilodactylus. 



Costal cilia of forewings wholly white 3. pentadactylus. 



„ „ not wholly white . 4. 



Costal cilia of forewings wholly dark fuscous 



1 . tetradactylus. 

 ,, ,, not wholly dark fuscous 



2. baliodactylus. 

 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, 

 W. Ireland, rather common ; 

 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 ; dorsal line and incisions 

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



3. P. pentadactylus, L. 26-29 mm. 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 nun. Forewings yellow- 

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

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



