38 BRITISH LKPlDOPTERA. 



a. Nervures of forewings never white. 



a. Forewings unicclorous slate-grey, with light, not prominent, 

 spots on the transverse nervures ; in the outer half of the wing 

 with only traces of a blackish line, which sometimes disappear 

 altogether. Head and collar externally margined with white — 

 vespertilio, Esp. 



j3. Forewings with a distinct dark oblique band, which commences 

 in a point at the outer angle, and ends broadly on the inner 

 margin. Head and thorax broadly light-margined externally. 



a. The light colour before the oblique band of the forewings 

 is darkened with fine atoms, and passes gradually towards 

 the middle of the wing into die darker colour of the 

 costa. 



1. Colour of costa and of the oblique baud of 

 forewings, as also that of body, dark olive- 

 green. On the transverse nervure of the fore- 

 wing stands a distinct black dot — hippophaes, 

 Esp. 



2. Costa and oblique band of forewings, as also 

 the head, of a clay-yellow tint, inclined to 

 brown. The small black dot on the transverse 

 nervure of the forewings of preceding species 

 is wanting or onlv finely indicated— bienerti, 

 Staud. 



b. The light ground-colour of the forewings forming a 

 yellow or whitish band before the oblique band, sharply 

 dark margined on both sides. 



i . The red of the hindwings unicolorous. Antennae 

 above entirely white. Epaulettes always white- 

 margined internally — zygophylli, Och. 



2. The red band of the hindwings is, in the upper 

 part, much lighter, whitish. Antennae above 

 dark olive-green, only at apex white. Epaulettes 

 always without light margin to the inner side — 

 gallii. Rott. 



c. The light ground-colour of the forewings is not sharply 



defined inwardly, but mostly extends as far as the costa. 

 The dark colouring of the latter projects in the middle 

 as a large patch into the ground-colour. 



1. Ground-colour of forewings (before the oblique 

 band) white in the lower part. Red of hind- 

 wings very light, inclining to yellow-brown. 

 Underside of wings and body entirely without 

 red colour, only with a hardly - perceptible 

 reddish tinge in the middle of hindwings. 

 Epaulettes internally white-margined- maure- 

 tatu'ea, Staud. 



2. Ground-colour of forewings never white. Red 

 of hindwings very vivid. Underside of wings 

 and body entirely covered with red. Epaulettes 

 internally mostly not light-margined, or hav- 

 ing also white or reddish inner margin — 

 euphorbiae, Linn. 



3. The oblique baud of forewings much steeper 

 than in D. eujphorbiae, &c, &c. — nicaea, 

 Prunner. 



b. Nervures of forewings, excepting those of costa and basal area, mostly 



white. Epaulettes always interiorly with broad white margins. 



n. Antennas above white — tithymali, Bdv., co&krfa, Nordm., dahlii, 



Eib.-Gey. 

 ft Antennae above dark olive-green with white tip. The abdomen 



in the incisions alternately black and white coloured. The red 



band ol the hindwings unicolorous- liltorntca, Esp. 

 B. Hindwings at the base and inner margin red, with two black transverse 



bands, 



