EUSTROMA] HYDRIOMENIDAE 203 



13. EUSTROMA, Hb. 



Face with cone of scales or nearly smooth. Antennae in < 

 ciliated. Palpi rough-scaled. Forewings in $ with strong sub- 

 dorsal hair-pencil from base beneath, sometimes partially cloth- 

 ing Ib ; areole double. Hind wings : 8 anastomosing with cell to 

 beyond middle. 



A limited group, characteristic of northern temperate regions; 

 derived from Hydriomena. 



1. Forewings brown or dark fuscous . . 2. 



,, yellowish or reddish-grey . . 3. 



2. Veins mostly white . . .1. reticulata. 



not white . . . .2. prunata. 



3. Cilia sharply barred . . .3. associate. 



not barred . . . . .4. 



4. Anterior edge of median band right-angled 5. testata. 



not right-angled 



4. populata. 



1. E. reticulata, F. 21-24 mm. Forewings dark fuscous, 

 veins except near costa ochreous-white ; seven ochreous-white 

 transverse lines, first nearly straight, second to fourth acutely 

 angulated below middle, fifth strongly curved ; an ochreous- 

 white oblique apical streak to seventh ; an ochreous-whitish 

 irroration before seventh except towards costa. Hindwings 

 pale fuscous, with whitish postmedian and subterminal lines; 

 in $ a round yellow-ochreous discal spot, in $ a dark grey dot. 



Westmoreland, Cumberland, very local; C. Europe, N. Asia; 

 7. Larva slender, yellow -green, tinged with pink or slate - 

 colour; dorsal line brown-red; subdorsal whitish; spiracular 

 fine, white ; spiracles pink : on Impatiens noli-me-tangere ; 8-10. 



2. E. prunata, L. (ribesiaria, B.) 32-38 mm. Forewings 

 brown or ochreous-brown, with indistinct darker striae ; second 

 fascia posteriorly white-edged, angulated below middle ; median 

 band suffusedly darker, white-edged, anterior edge angulated 

 in middle, posterior with a rounded double median projection ; 

 subterminal line white, preceded by dark fuscous spots ; a semi- 

 oval dark fuscous white -edged subapical blotch. Hindwings 

 grey ; costa and three waved posterior lines whitish. 



Britain to the Orkneys, Ireland, common in gardens ; N. and 

 C. Europe, N. Asia, N. America; 7. Larva green or dull 

 brown ; 3 dilated, with a transverse purplish or darker brown 

 pale-dotted ring ; a dorsal series of whitish purple-edged brown- 

 centred triangles : on currant and gooseberry (JKibes) ; 5, 6. 



