zygaena] ZYGAENIDAE 449 



mm. Antcnnal thickening stout, rather short, obtuse. Ab- 

 domen blue-blackish. Forewings thinly scaled, blue-blackish 

 or green-blackish ; three elongate crimson blotches, first along 

 costa to beyond J, second in disc from base to beyond middle, 

 third above second from before middle to |, apex much dilated. 

 Hindwings thinly scaled, crimson; termen sometimes blackish 

 near apex ; cilia blue-blackish. 



Forfar, Argyll, W. Ireland, local; Europe, WC. and N. 

 Asia ; 6, 7. Larva dark green or yellow-green ; dorsal line 

 whitish ; a subdorsal series of black spots, usually single ; a 

 lateral series of yellow spots ; head black : on Thymus ; 8-5. 



2. Peooris, F. 



Head smooth. Antennae more or less thickened towards 

 apex, in $ bipectinated. Thorax smooth beneath. Abdomen 

 smooth. Femora smooth, posterior tibiae without middle - 

 spurs. Forewings : 8 and 9 separate. Hindwings : 6 and 7 

 sometimes connate, upper margin of cell not angulated. 



A genus of some extent, principally inhabiting Europe, 

 Asia, and Australia. Imago with forewings less elongate than 

 in Zygatna. The species are generally unicolorous, and their 

 specific discrimination is often difficult. The larvae when 

 young mine blotches between the surfaces of the leaf. 



1. Antennae thickened apically, obtuse . . 2. 



„ not thickened, pointed . 3. globulariae. 



2. Forewings partly speckled with dark grey, termen 



straighter ... 2. statices. 



„ uniform, termen more rounded 1. geryon. 



1. P. geryon, 1Tb. 20-23 nun. Antennae thickened to- 

 wards apex, obtuse. Head and thorax golden-green or blue- 

 green. Abdomen coppery - green. Forewings golden - green ; 

 termen rounded ; cilia dark grey. Hindwings dark grey. 



England, local; C. and SW. Europe, Asia Minor to Turke- 

 stan ; 5, 6. Larva whitish or pale yellow, sides reddish- 

 brown ; dorsal line double, purplish-brown ; subdorsal dull 

 purple ; subspiracular pale flesh-colour ; head and plate of 2 

 black : on Helianthemum. ; 7-5. 



2. P. statices, L. S 26-30 mm., ? 23-25 mm. Differs from 

 P. geryon as follows : abdomen blue-green, golden-green, or 

 coppery, forewings usually more or less speckled with dark grey, 

 termen straighter, hindwings more thinly scaled and therefore 

 appearing lighter. 



Britain to the Clyde, Ireland, rather local (infrequent in 

 2g 



