THE GENERA OF BRITISH MOTHS, dil 
gloss, and the ground colour is generally dull orange. The tips of the front wings are slighly faleate, and 
the margin of the hinder pair rather dentate. The Caterpillar is not attenuated towards the extremities, though 
the head is small. The Chrysalis is formed in the earth. There is only one British species. 
C. bilineata (the Yellow Shell, No. 9), is one of the commonest of the moths popularly known as the 
Carpets. The Caterpillar, as described by Freyer, is greenish white, with a dark dorsal line, and white lines at 
the sides. It feeds on grass and other plants. It is common everywhere about the end of June. 
The genus Calocalpe—the Eucosmia of Stephens. The insects in this genus agree with those of the 
two preceding genera in the denticulation of the hind wings; but the palpi are not arranged in a beak-like 
form, and the hind wings of the males have a tuft of scaly hair on the inner margin. ; 
C. undulata (the Scallop Shell, No. 10). This elegantly marked insect, the regularly undulating 
transverse stripes of which have suggested its specific name, is by no means common. The Caterpillar, as 
described by Treitschke, is blackish gray, with paler lines on the back, and a broader pale line at the sides. 
It feeds on the Sallow, and the Moth appears in September and October. It has been recently taken at 
Oxford, Plymouth, York, and several other places, but only sparingly. This is the only British species. 
The sixteenth sub-family of the Geometride is that of the Sionidi, which contains two genera, Siona 
and Gypsochroa. 
The genus Siona of Duponchel is nearly identical with the Jda¢a of Ochsenheimer and Stephens. The 
insects assigned to it have the antenne simple in both sexes; the palpi short and slender, but appearing beyond 
the head. The tips of the wings are not acute, and are destitute of markings. The only British species has 
the wings white without variation, except the dark lines of the veins. 
Siona dealbata (the Black-vein, No. 11). This singular insect forms the type of a very distinct genus, 
as may be seen by its generic character, and by the form of the wings, which are very distinct from those of 
the genera which precede and follow it. It is taken in July, chiefly in woods in the south of England ; but it is 
rather scarce. 
The genus Gypsochroa. The insects assigned to this genus have the antenne simple in both sexes; the 
abdomen long ; the fore wings oblong, the tip narrow, and they are without distinct markings. The hind 
wings are short and narrow. The Caterpillar is unknown. There is only one British species. 
G. niveata (the Snowy, No. 12) is at present a very rare insect, only two places being cited for its 
capture. The representation in the present plate is taken from Hiibner’s figure, as the only specimen I could. 
get access to consisted only of a pair of mutilated wings, and part of the body. 
