33 



The situations where it is found are woods. 

 The perfect insect appears in April. 

 The date of the appearance of the caterpillar is in April. 

 It feeds on the birch. 



The chrysalis, which is green, is found in the lichens 

 and bark of birches. 



MICROPTERYX SPARMANELLA. 

 Plate CI. Figure 1. 



Localities for this species are near York. 



The perfect insect appears in February, February 20, 

 April and May. 



The date of the appearance of the caterpillar is in July. 



It feeds on the birch. 



The chrysalis is found below the surface in a small 

 cocoon. 



MICROPTERYX SUBPURPURELLA. 

 Plate CI. Figure 2. 



Localities for this species are York, Scarborough, Lewes, 

 Market Harborough, Beckenham. 



The situations where it is found are among oaks. 



The perfect insect appears in May. 



The caterpillar is whitish yellow, with a line along the 

 back of greenish grey ; and on the sides of the fifth and 

 sixth segments is a slight protuberance ; the head reddish 

 brown. 



