THE BUFF ARCHES. 85 



on the sides of a chip box. The caterpillar is greyish, with 

 some short hairs and black dots ; the back is broadly marked 

 with yellow, and there is a yellow stripe, with black dots on it, 

 low down on the sides ; rings four and eleven have each a raised 

 black spot ; head blackish. Feeds from June to September, on 

 dwarf sallow {Sali.v rcpe7is)^ and also on young plants of aspen. 

 Like other caterpillars of this genus, it hides by day in a packet 

 of leaves spun together. There arc certainly two Ijroods, if not 

 more, in the year. The moth emerges in May, and more 

 irregularly in July or August, and October. Except when 

 attracted to a light, the moth is rarely seen, but in fens, marshes, 

 and boggy places generally, the caterpillars may often be 

 obtained in numbers almost throughout the United Kingdom. 

 Its distribution abroad embraces Northern and Central Europe, 

 with extension into Northern Spain and Italy ; Bulgaria, South- 

 east Russia, and Armenia. 



THYATIRID.4^:. -^ Ct^TnQ. toj^koridioit. 



The nine British species next to be considered belong to the 

 old family Cymatophorida?, but as the name Cymatophora^ as 

 indicated by Hiibner in the "Tentamen " (1816), is now generi- 

 cally used by authors for some species of Geometridit ; and as 

 Hiibner's Verzeichniss generic names will have to be used for 

 the species previously included in Cymatophora^ Tr., the term 

 Thyatiriditi has here been adopted for this family — the Polyplo- 

 cidas of Meyrick and others. 



The Buff Arches ( Ih^m^mtx dcrasd). 



This pretty species (Plate 36, Figs, i, 2) is well distributed 

 over the greater part of England and not at all unconmion in 

 the more sylvan districts of the southern counties. It occurs 

 in Wales but has only once been recorded from Scotland. In 



