TR/FID.E. 157 



a yellow dusting along the costal region, and the nervures 

 tinged with pale yellow-brown. Body and leg tufts yellowish- 

 white, legs pale yellow-drab. 



Extremely constant in colour and marking ; there being 

 but a small variation in the depth of the browner shading, 

 and the uncertainty of white streaks on additional nervures 

 already alluded to. 



On the wing in June and July, but sometimes from the 

 wnd of May to August. Apparently only the extended 

 emergence of a single generation. 



Larva smooth, plump, cylindrical, and tapering very little 

 to either end ; head rounded, pale green or pale brownish- 

 green ; ground colour greenish-white or extremely pale 

 greenish-grey ; dorsal line pale gi-eeu, yellow-green, or 

 pale yellow, edged on each side by a green or light 

 brown stripe, which is followed at a short interval by a 

 similar subdorsal stripe ; below this are two pale green 

 or yellow lines, edged on each side with grey or brown 

 threads, and an obscure greenish or brownish spiracular 

 stripe ; undersurface and prolegs a rather paler tint of the 

 ground colour ; legs rather darker. 



August to INIay on AmmophUa arundinacca (Marram 

 grass), feeding at night on its hard, curiously lengthwise- 

 rolled leaves, hiding in the daytime in the sand at its 

 roots. Apparently quite restricted to this plant, upon sea 

 sand-hills, in its natural state ; yet has been found by Mr. G. T 

 Porritt to feed readily in confinement on ordinary field grasses. 



Pupa thin-skinned and delicate, light chestnut-brown, 

 limb-covers very glossy, but wing-covers dull from abundant 

 sculpture of minute incised lines ; abdominal segments glossy, 

 except a very narrow anterior band of minute pitting ; anal 

 segment thick, rounded, terminated by a blunt rounded 

 cremaster, on which are the usual two points, extremely 

 fine and thin, and around them several other smaller bristles. 

 In a brittle cocoon in the sand. - :• 



