212 THE ENTOMOLOGIST. 



darker green ventral surface ; midway between these two stripes 

 is a faint and fine whitish green line, and another broader sub- 

 cutaneous line of the same colour immediately below the spiracles, 

 which are small and have a pale yellow anterior blotch. The 

 legs are pale olive and the claspers green. The entire surface is 

 granular and sprinkled with minute black claw-like points, each 

 rising from a pale spot. 



Although the larvae in captivity readily feed on Poa annua, 

 Festuca ovina, and other grasses, its natural food-plant in a wild 

 state is Nardus stricta. 



When feeding on P. annua and other soft grasses it eats away 

 the sides of the blades, but with Festuca, Nardus, and other hard 

 rush-like species it eats away the ends, always starting at the 

 extreme tip of the blade, taking slow and deliberate bites, appa- 

 rently biting it through with some difficult^'. 



During the last stage the larvae frequently feed in the day- 

 time, but mostly so at night. 



A larva which moulted on April 14th, 1913, for the third and 

 last time, ceased feeding on May 14th, and pupated on the 19th, 

 remaining thirty-five days in the last stage, and its total larval 

 existence occupied a period of two hundred and eighty-eight days. 



The pupa measures from 10 mm. to 11 mm. long ; it is more 

 elegantly formed than that of F. hlandina, as it is without the 

 dorsal swelling of the second and third abdominal segments, and 

 rather more slender in proportion. 



Lateral view : The head is somewhat square in front, thorax 

 rounded, metathorax sunken, abdomen swollen at the middle, 

 conical and tapering, anal segment terminating in a decurved 

 elongated cremaster without any hooks, abdomen and wings 

 running in a continuous curve ventrally. 



Dorsal view : Head truncated, slightly angular at base of 

 wings ; these and the abdomen are uniform in outline, later 

 conical, cremaster pointed. 



The ground-colour varies from light yellow-green to cream. 

 The palest cream forms have the thorax and wings pale ochreous 

 buff, abdomen cream or pale primrose-yellow. In all forms the 

 head is shghtly darker. The head, thorax, limbs, and wings are 

 streaked with olive-brown ; the wing-streaks run parallel between 

 the nervures and along the discoidal cell ; the antennae, tongue, 

 and eye are strongly outlined with the same colour, and a medio- 

 dorsal streak extends from the head to the metathorax, blending 

 into the green dorsal vessel, which forms a slightly darker longi- 

 tudinal stripe ; the abdomen is more or less speckled with olive 

 and dusky dots, some very minute, mostly running in longitudinal 

 series ; the largest spots are on the ventral surface. The thorax 

 and abdomen are sprinkled with minute spines, and the surface 

 is finely granular. Being without cremastral hooks, the pupa is 

 detached, merely resting low down among the grass-stems, which 



