TRIFIDsE. 39 



sents the reniform stigma; bind margin dotted with black 

 Hind wings white, faintly dusted with purplish-grey, and 

 with yellowish-brown along the costa; central spot large, 

 black, beyond it is a slender faintly brown transverse line. 

 Body purplish-white or reddish-drab ; legs white or grey- 

 white streaked with black. 



Hardly variable, though occasionally the ground colour is 

 a little tinged with smoky-grey, in which case the stigmata 

 usually remain pale. 



On the wing in September and October, and after hyber- 

 nation, from February till April ; but it only seems to hyber- 

 nate during severe weather, and has been met with even in 

 December. 



Larva cylindrical and rather uniform in thickness ; head 

 full and rounded, delicate green with a patch of paler freckles 

 on the side of each lobe ; ground colour rather transparent, 

 pale bluish-green, thickly sprinkled on the back with opaque 

 minute whitish freckles ; on the back of the second segment 

 are four whitish dots ; on the rest of the body the dorsal line 

 is opaque, whitish, finely edged with darker green, but so 

 much interrupted as only to appear at either end of each 

 segment ; the subdorsal shows similarly as a broken whitish 

 line, but is less conspicuous, while the spiracular line is 

 indicated still more faintly, existing as an interrupted series 

 of larger whitish freckles than those which besprinkle the 

 skin ; these on the undersurface are more sparingly scattered 

 than above, and it is of a yellower green ; the raised dots are 

 of an opaque white ringed with unfreckled ground colour, 

 and each bears a fine whitish hair ; spiracles white, delicately 

 outlined with black ; legs well developed and terminated by 

 sharp whitey-brown hooks. 



The infant larva is whitish, with the head buff, but after 

 the first moult opaque white dots and hairs may be discerned 

 by the aid of a lens ; when three weeks old greenish-white 

 with the white raised dots distinctly visible ; a week later the 



