The butterfly is common and often abundant in July and August, chiefly the latter month, on chalk downs in Oxfordshire, Buckinghamshire, Berkshire, Kent, Surrey, and Sussex; it is also found in the Newmarket district of Cambridgeshire and on one chalk hill in Norfolk, according to Barrett, who adds: "on the oolite as well as the chalk in Wilts, Dorset, Gloucestershire, and Somerset; and on limestone at Grange and Silverdale in North Lancashire, in Lincolnshire, Westmoreland, and Cumberland. It has also been taken in Essex, Hants, Cornwall, and in one locality in Glamorganshire." Mr. Sydney Webb has stated that a dwarf form occurs pretty regularly in a valley about two miles east of Dover, but that it only appears to be found at odd times in other parts of England. Abroad, the species is found in Central Europe, also in the Pyrenees, Aragonia, and the Balkan Peninsula. The Adonis Blue (_Lycæna bellargus_). The butterfly on Plate 110 is the Clifden Blue of Moses Harris (1775), so named because it was said to have been first observed at Clifden in Bucks. The male is of a beautiful bright blue colour, but as in the same sex of the previous two species, it is not quite constant in tint. In some specimens we find a distinct mauve shade, and in others, but more rarely, the blue colour is tinged with greenish (Plate 118, Fig. 11): the veins become distinctly black on the outer margins, and appear to run through the white fringes on all the wings. Often there are black dots on the outer margin of the hind wings. The female is dark brown, sometimes slaty-black, with orange spots or crescents on the outer margins; these are often only faintly in evidence on the fore wings, and sometimes this is the case on the hind wings also; there is a black discal spot on the fore wings, and the fringes of all the wings are white chequered with black. The bases of the wings are powdered with blue, but this is more noticeable on the hind wings. On the under side the fore wings of the male are greyish, and the hind wings greyish-brown; all the wings of the female are brownish, with a faint grey tinge in some specimens; the ornamentation is very similar to that of the Common Blue. The two figures on Plate 110, showing specimens with the wings closed, represent typical male and female, and the other figures of under sides on this plate exhibit minor aberrations from typical lines; examples of the more extreme variations will be found on Plate 118, where also are figured some uncommon aberrations in the colour of the male on the upper side.