THE GENERA OF BRITISH MOTHS. 105 
PLATE XII. 
No. 1—The May High-flyer (Hydriomena implwviata). | No, 7.—The Brindle-barred Yellow (Acasis viretata). 
No. 2.—The Caterpillar of the May High-flyer. | No. 8.—The Early Tooth-striped (Lobophora lobulata). 
No 3.—The Dark Marbled Carpet (Polyphasia immanata). No. 9,—The Caterpillar of the Warly Tooth-striped. 
No. 4.—Juniper Carpet (Thera Juniperata). No. 10.—Beautiful Pug (Eupithecia Linaviata). 
No. 5.—The Winter Moth (Cheimatobia brumata). No. 11.—The Caterpillar of the Beautiful Pug. 
No. 54.—The Female of the Winter Moth. No, 12,—The Marbled Pug (Eupithecia irriguata). 
No. 6.—The November Moth (Oporabia dilutata). 
Tue present Plate contains the remainder of the genera contained in the fourteenth Sub-Family of 
Geometride—the Cidaridi—the first portion of which was included in Plate XL. 
The genus Hydriomena. This is the genus Ypsipetes of Stephens, Hiibner’s name Hydriomena having 
been recently adopted on account of its priority of date. The insects assigned to it have the antenne simple 
in both sexes. The abdomen is rather stout ; the wings are of large proportion, and have greenish markings, 
with variegated fringes ; the hind wings are silky, and nearly without markings. The insects have a peculiar 
kind of flight, generally at a considerable height, from which habit they are popularly known as High-flyers. 
The Caterpillars are rather short, with lateral stripes; and they feed on the foliage of trees or shrubs. The 
Chrysalis is formed among leaves. There are three British species. 
Hydriomena impluviata (the May High-flyer, No. 1). This species is very variable, both in the strength 
and distinctness of its markings; but their character may be easily recognised in the palest as well as in the 
most strongly-marked specimens. The Caterpillar (No. 2) feeds upon the foliage of Birch and Hazel. The moth 
appears in May, towards the end of the month. It is found in the woods of Kent, flying at evening in damp 
places ; but is said to be more abundant in the north. It has recently been taken in plenty near Manchester, 
in the Cotswold Hills, at Halton in Buckinghamshire, and other places. 
The other species are H. elutata (the July High-flyer), which may be easily recognised by the greater 
irregularity of its transverse bands, which approach, almost, to a rather general mottling of greenish tone, 
which varies very much in different individuals; a small variety having the markings much more brown in 
colour, and of a dusky effect from their general blending. H. ruberata, the third species, was by some considered 
a variety of H. impluviata ; it is, however, now considered a distinct species. It is greenish gray in tone, 
having a broadish dark band aboye and below the centre of the front wings, which are tinged with red. 
- The genus Polyphasia. The insects classed by Stephens in this genus being exceedingly variable, were 
formerly divided into eight distinct species, but these are now reduced to two, which are by some authors 
placed in the genus Cidaria. The insects retained in the genus have the antenne simple in both sexes. 
The Caterpillars are slender, and have short tubercles on the terminal segment. The Chrysalides are sometimes 
variegated in colour. 
Polyphasia immanata (the Dark Marbled Carpet, No. 3). This variable insect is common everywhere, 
though some of the varieties were once deemed rare. The P. marmorata and P. wmenata of former authors 
were varieties of this species. The Caterpillar still remains undescribed. The perfect insect appears in July 
and September. 
