This species (Plate 147, Figs. 3-5) is the most generally common of our Burnets. Perhaps the most frequent form of variation in the spots of the fore wings is that in which the outer pair run together, and so form a blotch; but union of the middle pair is not an uncommon occurrence. In ab. _cytisi_, Hubner, the three pairs of spots are each united, so that the fore wings have three separate blotches, and when these are of a dull scarlet instead of the usual crimson, ab. _ramburi_, Lederer, is represented. Occasionally, all the spots are united, as in ab. _cytisi_, and the blotches thus formed are connected by reddish streaks in various modifications leading up to ab. _conjuncta_, Tutt, which has all the spots merged into a large blotch, extending over the disc of the fore wings. From the normal crimson, the spots and the hind wings vary now and then to orange (_aurantia_, Tutt), or to yellow (ab. _flava_, Robson = _cerinus_, Robson and Gardner); intermediate shades between these two extremes, and the typical coloration, are rather more frequent. I am indebted to Mr. R. Adkin for the loan of the example of the yellow form shown on Plate 148, Fig. 6. Pink, and orange, forms have been noted from various parts of England, but they seem to occur, or have been found, more especially in Cambridge and the north-east corner of Essex. Fig. 7, Plate 148, represents an example of ab. _chrysanthemi_, Hubner, and is copied from Oberthur's _Etudes d'Entom._, xx., Plate 8, Fig. 134. A few specimens referable to this form, probably not exceeding half a dozen altogether, have been recorded as taken in England. In typical _filipendulae_ the dark blue border of the hind wings is narrow, but in ab. _hippocrepidis_, Stephens (_tutti_, Rebel), the borders are rather broad. Another character of this form is that the nervule upon which the sixth spot is placed is here of the ground colour, and therefore divides the spot. (Plate 147, Fig. 3.) At Northwood, Middlesex, I have found this form in May and June, and also in the Weybridge district, Surrey, in late July; and, it may be added, there was a flourishing colony of _Z. trifolii_ hard by in each locality. For this reason, plus the fact that _trifolii_ [male] is known to pair with _filipendulae_ [female], I hold the opinion that _hippocrepidis_ is a hybrid. It may be noted here that hybrids have been raised from the crossing of _filipendulae_ and _lonicerae_; the sexes of _lonicerae_ and _trifolii_ pair somewhat readily, and the hybrid offspring of such pairings are fertile. [Illustration] 2 Pl. 148. 1. NEW FOREST BURNET, AB. _CONFUSA_. 2, 3, 4, 5. FIVE-SPOT BURNET, VARS. 6, 7. SIX-SPOT BURNET, VARS. [Illustration] 2 Pl. 149. 1. FESTOON MOTH: _caterpillars and cocoons_. 2. TRIANGLE MOTH: _caterpillars_.