TORTRIC1NA. 115 



marks upon the costa, and the white or cream-coloured head. In 

 H. Paykulliana the head is pale grey. 



The imago appears in June among Birches (Haworth says on 

 the trunks of ash-trees). It occurs throughout the country. 



The larva feeds in the catkins of the Birch. 



FAMILY III. ANCHYLOPERID-ffi. 



The insects contained in this group may be distinguished 

 chiefly by the produced apex of the anterior wings. This cha- 

 racter is most fully developed in Anchylopera, whilst in some 

 of the genera this peculiarity is altogether wanting ; but their 

 affinity is maintained, at least so far as the existing knowledge 

 of the family permits. 



The anterior wings are usually longer and narrower than in 

 the Plicate ; the costa is neither folded nor obtusely rounded at 

 the base, but always regularly arcuated (except Anchylopera pars, 

 Dictyopteryx, and Crossia). 



In the larva state they feed mostly in united leaves : some 

 few (Hedya pars, Bactra] are internal feeders ; the former in the 

 bark and twigs of Poplars, the latter in the stems and roots of 

 Rushes. 



This family consists of eight genera, which are tabulated in 

 the following order : 



A. Anterior wings with the apex slightly 

 produced. 



a. Palpi with the middle joint three times 



as long as the apical 2. STEGANOPTYCHA. 



a a. Palpi with the middle joint five times 



as long as the apical 1. HEDYA. 



B. Anterior wings with the apex much pro- 

 duced. 



b. Palpi with the middle joint not three 



times as long as the apical . . . .6. DICTYOPTEEYX, pars. 

 bb. Palpi with the middle joint three 



times as long as the apical .... 3. ANCHYLOPERA. 



C. Anterior wings with the apex acute, but 



not produced. 



c. Palpi with the middle joint not three 



times as long as the apical . . . .5. AROYROTOZA. 

 c c. Palpi with the middle joint three 



times as long as the apical . . . . 4. BACTRA. 



i2 



