26 LITHOSIA PYGMJIOLA. 



most distinct, and there unite across the back ; a 

 faintly darkish tinge of the same colour runs along 

 the back from the head; the three hinder segments 

 are almost colourless ; the body is clothed with long 

 whitish hairs. 



When eight days old they had become of a light 

 greenish-drab colour and seemed of a wandering dis- 

 position, as I found several on the outside of the pots. 



After hybernation the larvse were nowhere to be 

 seen. 



Another batch of eggs was received from Mr. Tug- 

 well on the 21st August, 1879, just similar to the 

 above ; on the 30th they became more transparent and 

 showed the embryo rather plainly through the shell as 

 a dark grey spot. (W. B., Note Book III, 250.) 



LlTHOSIA MUSCERDA. 



Plate XLI, fig. 7. 



Eggs were received from Mr. Barrett on July 30th, 

 1870, and larvae hatched on August 3rd. To these 

 the same treatment and food was given as had already 

 been tried with the larvse of Nudaria senex (see p. 37). 

 They hybernated small, when about one-fifth of an 

 inch long ; three were seen alive and feeding in 

 February, 1871, these moulted at the end of March ; 

 two were then accidentally lost ; the survivor moulted 

 for the last time on May 6th, and was full-fed about 

 the end of that month ; it spun a cocoon, but had not 

 strength to become a pupa. 



Probably the right food for this larva is some sort 

 of lichen growing on the sallow bushes in the soaking 

 wet parts of the fens, where the moth occurs ; Mr. 

 Barrett noticed that it affects these bushes far more 

 than any other kind of growth in the fens, and he 

 observed that it is on the wing from early dusk till 

 darkness sets in, when it disappears until midnight, 



