The male _Edusa_ is shown on Plate II (fig. 3), and when we compare it with its relative on the opposite side, we are at once struck with the superior richness of the brilliant orange or saffron of the ground colour. The black border of both fore and hind wings is also denser, wider, and more extensive. The whole of the yellow area of the hind wings is dusted more or less with black scales, with the exception of a round central spot of deep orange, corresponding with the orange spots on the hind wings of _Hyale_. The female, which is shown in the accompanying woodcut, is generally larger than the male, and is further distinguished by the very pale yellow spots that break the black border of both pairs of wings. [Illustration: FIG. 66.--THE CLOUDED YELLOW--FEMALE.] _Edusa_ further resembles _Hyale_ in the reddish colour of the antennae; and, in both the species, the red legs form a pleasing contrast with the yellow furry surface of the under side of the thorax. There is a variety of the female of this butterfly, in which the ground colour is a _very pale_ yellow, almost white. The hind wings are more thickly dusted with black scales than in the normal insect, and the orange spots of these wings show up much more conspicuously from the contrast with their surroundings. It is usual to apply distinct names to constant varieties of species--names that are to be added to the ordinary title. In this particular case the distinguishing name is _Helice_, so that we should speak of the variety of _Edusa_ above mentioned as: _Colias Edusa_, var. _Helice_ Like _Hyale_, _Edusa_ is particularly capricious in its appearance. In certain summers it absolutely swarms in favourite localities, while during the intervals between such remarkable appearances--usually several years--it is positively scarce. The last favoured season was the summer of '92, during which (from the beginning of August to the end of the summer) dozens might easily have been caught in an hour or two; in fact, so plentiful were they in many places, that they were continuously in sight, often several at one time. Those in search of this insect should repair to the south coast, especially the south-east, and where lucerne and clover fields are in flower. It has very decided maritime tendencies, and may often be seen flying over the cliffs and beaches, and even skipping over the breakers; but, at the same time, it is more or less plentiful in many inland districts. It has been taken in many parts of Ireland and Scotland, particularly along the southern coasts of these countries; but its head quarters are undoubtedly the southern cliffs of England, from Cornwall to Kent, and also the hilly inland districts of the south-eastern counties.