GEOMETRY 



283 



FIG. 195. THE 

 TWIN-SPOT CARPET. 



The caterpillar feeds on many trees, the principal of which are 

 the oak, whitethorn and blackthorn. Like the perfect insect, it is 

 very variable in colour, but is generally of a bright green, with 

 reddish or purplish spots on the back and sides. The spiracles are 

 yellow or orange, and below them is a white stripe. It is full fed 

 in June. 



The Twin-spot Carpet (Larentia didymata] 



The Twin- spot Carpet is common throughout Great Britain, 

 and the beginner is likely to meet with it in June and July 

 during his first season. Our illustration re- 

 presents the male, the fore wings of which 

 are greyish brown, crossed by several dark 

 lines, and with a double dark and conspicuous 

 spot near the middle of the hind margin. 

 The female is much lighter, and the markings 

 are also lighter and less distinct. 



The caterpillar is pale green, with a nar- 

 row whitish line along the spiracles. It feeds in April and May on 

 the leaves of the wood anemone (Anemone nemorosa), chervil 

 (Chcerophyllum temulum), and other plants. 



The Grass Rivulet (Emmelesia albulata) 



We represent the genus Emmelesia by the Grass Bivulet a 

 pretty little moth that flies in June, and which is widely distributed 

 though not abundant. 



Its fore w r ings are pale grey, crossed by 

 several white lines, the arrangement of which 

 may be seen in our engraving. The hind 

 wings are of the same ground colour, but have 

 no markings except a white wavy line near 

 the hind margin. 



The caterpillar feeds during July and 



August on the seeds of the yellow rattle (Rhinanthus Crista-galli], 

 protecting itself from its enemies by spinning together the petals 

 of the flowers ; and when full grown it changes to a chrysalis under 

 the same cover. 



The Netted Pug (Eupithecia venosata) 



We now come to the enormous genus Eupithecia, containing 

 about fifty small species, most of which are known as ' Pugs.' 



FIG. 196. THS 



GRASS KIVULET. 



