16 LITH0STA AUREOLA. 



above the legs, thickly furnished with brownish-grey 

 hairs ; a few hairs longer than the rest proceeded 

 from the thoracic and anal segments ; the head itself 

 blackish-brown . 



This species spins up in the autumn and passes the 

 winter in the pupa state. (J. H., 5, 9, 68; E.M.M. 

 V, 113.) 



LlTHOSIA HELVOLA. 



Plate XL, fig. 6. 



On the 13th June, 1868, 1 received from Mr. Machin 

 four larvae of this species, then not far from full-grown ; 

 their food was a large coarse lichen growing on the 

 bark of yew trees. In a few days they had spun rather 

 loose cocoons, with a few grains of earth attached to 

 the silk, on the underside of the pieces of bark. The 

 moths appeared July 2nd to 6th. 



When full-grown, the larva is nearly three-quarters 

 of an inch in length, moderately stout, with the 

 posterior segments tapering slightly towards the tail ; 

 all the tubercles furnished with tufts of hair. 



The ground colour of the back varies — being pale 

 grey, whitish- grey, or white, and the colour of the 

 sides and belly is grey, brownish-grey, or greenish- 

 grey ; there is a subdorsal stripe of black, separating 

 the white back from the grey sides, and itself inter- 

 rupted by one of the hinder pair of tubercles on the 

 back of each segment ; down the centre of the back run 

 two black lines, which represent the dorsal stripe, 

 appearing united at the hinder end of all the segments, 

 as well as on the front of all, except the last four, and 

 interrupted through the middle of the others ; and 

 and between these lines and the subdorsal stripe comes 

 another fine black line on the hinder half of each seg- 

 ment. On the fourth segment the space between the 

 dorsal lines is filled up with black, forming a con- 

 spicuous lozenge-shaped mark ; on the eighth segment 



