128 THE GENERA OF BRITISH MOTHS. 
September, and the perfect insect appears in the following June and July. It has been taken at Dover, 
and in Norfolk, and more recently at Folkestone. 
The genus Rivula. The British species assigned to this genus has the antenne short and pubescent ; the 
palpi short ; the abdomen slender ; the fore-wings rounded at the hinder margin. The Caterpillar is short and 
thick, and speckled with conspicuous black spots ; the skin is shining. It feeds on low plants. The Chrysalis is 
attached by the tail and by a belt of web round the middle. 
Rivula sericealis (the Straw Dot). The Caterpillar of this species is velvety green, with a darker line down 
the back and white stripes at the sides. It feeds on grasses in May, and the Moth appears in June and July, in 
woods. It has recently appeared very abundantly at Brighton, Tenterden, Worcester, and other places. 
