118 THE GENERA OF BRITISH MOTHS. 
Caterpillar of this species is unknown, but the perfect moth appears in August, being, however, very rare. Mr. 
Stephens took a specimen at the North Foreland Meadow, near Dover; and it has been taken more recently 
near York. . 
The genus Acidalia, The British species assigned to this genus by Mr, Stephens, were separated by him 
from the preceding genus principally on account of differences in the structure of the feet. Their more elongated 
wings, free from clouding at the edges, forms, perhaps, a more obvious distinction, Thirteen species were 
assigned by this mode of separation to the genus Acidalia of Treitschke. Some English entomologists bring the 
number up to twenty-six by adding several species from other genera. 
Acidalia osseata (the Dark Cream Wave, No. 5). The larva of this pretty little species is unknown, ‘but 
the perfect moth is very common towards the end of June, in woods and old hedge-rows. 
The other species are the following : A. marginepunctata (the Dotted-bordered Cream Wave) is much like 
the preceding, but dusted with specks, and having some small black dots on the apical margin. A. obsoletaria 
(the Obscure Wave) is very dusky, and its marks imperfectly defined, but otherwise resembling the last. 
A. Perochraria (the Bright Wave) has the wings pale yellowish, with fonr brownish yellow bands on the fore 
wings, and three on the hind wings. It is very rare. A. Holosericcaria (the Silky Wave) is a new species. 
A. subsericeata (the Satin Wave) is cream colour, shaded and banded with ochreous tint. There are also 
A. inornata, A. degeneraria, A. aversata, A. remutata, A. Ceespitaria, A. fumata, and A. tmmorata, all more or 
less resembling each other in general character, A. aversata being the largest and handsomest. It is pale brown, 
with the inner dark band shading off gradually to the body, and the two external bands very distinct, the 
whole being powdered with darker brown. 
The genus Strenia. In this genus the antenne are short and slender, those of the males being slightly 
pubescent. The front and hind wings have similar markings, and generally of a tawny colour. The Caterpillars 
are short, and flattened beneath, and have spots emitting hairs. The Chrysalis is subterranean. There is but 
one British species. 
Sirenia clathrata (the Latticed Heath, No. 6). The Caterpillar of this beautiful species is said to be pale- 
green, with two white lines edged with dark green along the back, and another similar line at the side, and a white 
line above the legs. It feeds on Medicago, the common Trefoil, and other plants, in October and May, and the 
perfect moth appears in June and July. It is found on all chalky soils, but more especially in Kent. Brighton, 
Bristol, Scarborough, and many other places are cited for its recent capture in some plenty— and at Cambridge it 
has appeared in very great abundance. 
The genus Lucheca, The principal characters of this genus are, the antenne of the males slightly 
pubescent, the wings entire and thick, and held erect when in repose. The hind wings slightly angular. The 
Caterpillars are short and rather attenuated in front. The Chrysalides are formed in a slight cocoon, on the 
ground. There is but one British species. 
ELucheca heparata (the Dingy Shell), The Caterpillar of this species is yellowish-green, with a line of 
lemon-yellow at the back, and another at each side. It is also spotted with yellow. It feeds on the Alder and 
the common Birch in October, and the perfect moth appears in the following June and July. It is rather rare, but 
has often been taken in woods in Kent, Surrey, and Norfolk. It has heen more recently taken in some plenty in 
the Cotswold district, and at Tenterden, and more sparingly in many widely distant localities. 
The genus Hydrelia. The species assigned to this genus have the antenne of the males pubescent—the 
body slender, the wings of delicate texture, and marked by several transverse wavy lines. The Caterpillars are 
thickest in the middle and much attenuated in front. The Chrysalis is formed between leaves or moss. There 
are only two species. 
Hydielia Blomeri (the Blomer Rivulet,No. 8). The Caterpillar of this species is unknown. The moth 
is found in June and July. It appears to be a northern species, having been taken at Castle Eden Dene—at 
Pickering, and near Preston. The other species H. sylvata (the Waved Carpet), is much like Blomeri, but has 
the bands of more equal breadth. 
The genus Asthena, The characters of this genus very closely resemble those of Hydrelia, both the species 
of which ave placed hy some writers in the present genus, from which their truly generic differences are very slight, 
