a ne 
204 GRACILARIIDA. 
vein is furcate; the subcostal vein is obsolete towards the base; the 
subdorsal vein is simple. In the posterior wings the apical vein ter- 
ee above the apex, below it is a furcate vein; the median vein is 
rind, 
The habits of the perfect insects of this genus are very similar 
to those of the Gracilaria, but the smaller species are far more 
frequently observed on the wing. None of this genus pass the 
winter in the perfect state, all being then in pupa. The larve, 
when young, are true miners, and their mines can with difficulty 
be distinguished from those of a Lithocolletis larva; but as soon 
as the larva leaves the mine, the fact of its being untenanted, and 
no pupa-skin protruding, sufficiently demonstrates that it is no 
Lithocolletis mine. After quitting its mine, the larva turns down 
a piece of the edge of the leaf, and feeds within the cavity thus 
formed ; except in the case of the larva, which feeds on the haw- 
thorn, this turned-down place does not assume the conical form 
so prevalent with the larvee of Gracilaria; when full-fed, the 
larva turns down a smaller portion of the edge of the leaf, and 
spins therein a firm, rather flat, ochreous cocoon, 
I enumerate only nine British species of this genus, though 
probably I have individual specimens of two or three others, but 
the extreme similarity of many of the species renders it extremely 
unsafe to describe from single caught specimens; one of the 
strongest characters for discriminating the species lying im the 
eatreme tip of the cilia of the anterior wings, which can rarely be 
well seen except in dred specimens. On the continent are four 
or five other distinct species. 
The genus may be thus subdivided :— 
a. Anterior wings with numerous short whitish or white streaks from 
‘the costa. Species 1-8. 
aa. Anterior wings with three triangular yellowish marks on the costa. 
Species 9. 
1. Avellanella, Sta.—zmeleagripennella, Sta. Ent, Trans. i. n. s. 
88.—/awella, Curt.? Alis anticis dilute griscis, dorso albo-farinato, 
strigulis numerosis coste albidis, maculis duabus plice, una posteriore 
disci fuscis, puncto apicis fusco; cillis albidis, lineis duabus integris 
fuscis ad apice usque ad angulum analem; palpis albis, articuli tertii 
basi annuloque ante apicem fuscis. Wxp. al. 4 lin, 
Head whitish, mixed with fuscous. Tace grey. Palpi whitish, dhe 
last joint with the base and a ring before the apex fuscous. Antenne 
dark fuscous, annulated with white. Anterior wings pale grey, inter- 
mixed with white, especially along the inner margin; along the costa 
are numerous short whitish streaks, obliquely placed till near the apex, 
the three immediately before the apex nearly straight; in the fold are 
