NOTODONTJD.^. 99 



Larvae lobster-shaped, with very long anterior legs, no anal 

 prolegs, anal segment with a pair of erect filaments. 



PuPiG of quite ordinary shape, in a silken cocoon. 



1. S. fagi, L. — Expanse 2 to 2| inches. Fore wings long, 

 grey-brown, with indented, whitish, cross lines : and blackish 

 spots near the hind margin ; hind wings short, grey-brown. 



Antennae of the male very short, strongly pectinated, and 

 the teeth set well apart for three-fourths of their length, 

 when they suddenly terminate, the shaft curved forward, 

 and then straightened, with an angle, into a stiff simple spike : 

 chestnut- brown. Head ^strongly tufted, yellowish-grey, with 

 large whiter tufts at the bases of the antennte. Thorax 

 broad, densely covered with long fluffy scales, mixed, brownish- 

 grey and whitish ; abdomen stout, greyish-brown, often 

 whitish-brown, with a dorsal row of upright tufts of black 

 scales from the base to the middle, and a large flattened 

 anal tuft of long whitish scales. Fore wings long, rather 

 ovate : costal margin straight to the middle, then gently 

 rounded ; apex rather angulated ; hind margin below it 

 gently rounded, then bending suddenly, much more obliquely, 

 and sweeping off to the dorsal margin, with little indica- 

 tion of an anal angle, continuing its curve along the dorsal 

 margin, where is an edging of long grey scales. Colour 

 brownish-grey mixed with ashy-grey ; nervures faintly 

 tinged with yellowish ; base ashy-grey or whitish-grey ; first 

 line undulating and much indented, smoky-black, edged on 

 its basal side with yellowish or whitish ; second line placed 

 just beyond the middle of the wing, also much undulated 

 and indented, consisting indeed of crescents placed between 

 nervures, yellowish-white, partially edged inside with black ; 

 the broad baud between these two transverse lines much 

 clouded with dark grey or blackish, darkest toward the costa, 

 but tinged with dull purplish-red toward the dorsal margin. 

 At the end of the discal cell is a perj)endicular black streak 



