THE GEN®RA OF BRITISH MOTHS. 85 
PLATE XXXIII. 
No. 1.—The Feathered Thorn (Himera Pennaria). No. 8.—The Canary-shouldered Thorn (Odoptera Tiliaria). 
No. 2.—The Caterpillar of the Feathered Thorn. | No. 9.—The Caterpillar of the Canary Thorn. 
No. 3.—The Scalloped Oak (Crocallis Elinguaria). | No. 10.—The September Thorn (Odoptera Erosaria). 
No. 4.—The Caterpillar of the Scalloped Oak. No, 11.—The Caterpillar of the September Thorn. 
No. 5.—The Scalloped Hazel (Odontopera Bidentata). No. 12.—The August Thorn (Odoptera Angularia). 
No. 6.—The Caterpillar of the Scalloped Hazel. No. 13.—The Caterpillar of the August Thorn. 
No. 7.—The Large Thorn (Odoptera Alniaria). | No. 14.—The Purple Thorn (Odoptera Illustraria). 
Tue fifth Sub-Family of the Geometride is that of the Odopteridi, containing a very homogeneous 
series of genera, the most prominent of which are the group popularly known as the ‘Thorns,’ which are 
nearly all distinguished by the deeply indented outline of the wings, as implied by the term Odopteridi, formed 
of two Greek words signifying indented wings. There are ten genera in the Odopteridi. Himera, Crocallis, 
Odontopera, Odoptera, Pericallia, Angerona, Opistograptis, Owrapteryx, Eudalimia, and Ellopia. 
The genus Himera. This genus is distinguished by the deeply pectinated, or rather feathered, antenna of 
the males. The anterior wings are waved, but not dentate in the outline ; the hind-wings being simply rounded. 
The wings of the female are narrower. The larve are of long, but not slender proportion, with a single 
hump on the twelfth segment. The pupx are subterranean. There is only one British species. In the robust- 
ness of the body this genus exhibits some affinity with the Bistonidi, while in the waved outline of the anterior 
wings it approaches the typical Odopteridi, thus forming a link between the two Sub-Families. 
Himera Pennata (the Feathered Thorn, No. 1) is remarkable for the length of the pectinations of the 
antenne of the male, which have a feather-like appearance that has suggested both the systematic and popular 
specific names. The antenne in the female are simple, and the wings narrow. The Caterpillar (No. 2) feeds 
on Oak and other forest trees, the Moth appearing towards the close of autumn. It is a common and very 
widely dispersed species. Bristol, Halton in Buckinghamshire, Plymouth, and other places, are cited as localities 
in which it has been taken in great abundance. 
The genus Crocallis. This genus presents many of the same characters as the last. The antenne of the 
male are pectinated, but not plumose. The body is stout, the wingsa little indented. The larve are ‘ twig- 
like,” but slightly clothed with hair, and thickened towards the tail. They devour with avidity other Caterpillars. 
The pup are subterranean. There is but one British species. 
Crocallis Elinguaria (the Scalloped Oak, No. 3). The Caterpillar of this species feeds on the foliage of 
various fruit-trees and also on the Oak. The perfect insect appears in August. It is common everywhere. 
The genus Odontopera. In this genus we have the first types of the class with the deeply indentated 
wings which give their name to the Sub-Family under description. The larve have two additional pair of 
ventral pro-legs ; but they are only partially developed, and are not used in walking. The pup are subterranean. 
There is, however, but one British species, most of the species of ‘Thorns’ having been placed in the following 
closely allied genus. 
Odontopera Bidentata (the Scalloped Hazel, Nos. 5 and 6). In this genus, as illustrated by the present 
species, the antenne are still less pectinated than in the last-described genus ; the three genera Mimera, Cro- 
