THE GENERA OF BRITISH MOTHS. 143 
however, not very homogeneous, and are, therefore, divided into three sections :—1l. Semasia,; 2. Aspila ; 
and 3. £narmonia: the insects assigned to the last section having metallic or gold-like marks on 
the wings. 
Section 1 contains S. spiniana (the White Triangle T). 
Section 2, S. Janthinana (the Purple-shades T), and S. rufillana (the Dark Purple Shades T). 
Section 3, S. Weberana (the Weberian T, No. 20). The Caterpillar of this species (No. 21) is found under 
the bark of various trees, upon the inner tegument of which it appears to feed. It prefers the Apple, Plum, or 
Cherry, but is also found on the Laurel. The perfect insect, which is easily distinguished by the gold-like marks 
on the anterior wings, appears in May, and again in September, and is common almost everywhere. 
The Chrysalis (Nos. 22 to 24) is attached to the bark in stiff cocoons of a yellowish colour. 
