CBRURA] 



STOTODONTIDAE 



311 



. 2. 



1. vinula. 

 4. bicuspis. 

 3. 



Larva with two tubercles or rough spots on 2, back prominent 

 on 3 or 4, anal prolegs absent, anal extremity held aloft in 

 repose, furnished with two long slender terminal processes con- 

 taining exsertible filaments. Pupa in a hard woodlike cocoon 

 on bark of trees. 



1. Lines of forewings partly orange-edged 



,, not orange-edged 



2. Anterior edge of band irregularly indented 



nearly straight 



3. Posterior edge of band angulated or bent inwards 3. furcula. 



evenly curved . 2. bifida. 



1. 0. vinula, L. 58-72 mm. Forewings whitish, veins par- 

 tially blackish ; a black subbasal dot ; lines double, dark grey, 

 forming black costal dots; first 

 formed anteriorly of black dots, 

 posteriorly subdentate ; space be- 

 tween first and median greyish- 

 tinged ; median sinuate ; second 

 partly triple, very strongly den- 

 tate ; a crescentic blackish discal 

 mark ; a terminal series of longi- 

 tudinal dark grey interneural 

 marks. Hindwings in $ whitish, 

 with grey discal crescent, in <j> 

 grey. 



Britain to the Hebrides, Ireland, 

 common ; Europe, WC. and N. 

 Asia ; 5, 6. Larva green ; a broad 



Neuration of Centra vinula. 



purplish-brown pale-streaked white-edged dorsal band, narrowed 

 to 4, thence expanded to 8, where it sometimes projects to 

 proleg, and again narrowed to 12 ; head brown : on poplar and 

 Salix; 6-8. 



2. C. bifida, Hb. 40-44 mm. Forewings grey-whitish ; a 

 black subbasal dot ; lines double ; first nearly straight, formed 

 by a series of black dots and a black orange-edged streak ; 

 space between first and median densely irrorated with dark 

 grey ; median curved inwards, formed by a black orange-edged 

 streak and a fine dark grey line ; second triple, dark grey, 

 dentate, posteriorly black and orange -edged on upper half, 

 followed by a dark grey suffusion ; a black discal mark ; large 

 terminal black dots. Hindwings whitish ; a grey discal crescent 

 and usually a terminal band. 



England to York, Ireland, rather common ; C. Europe, NW. 



