Lepidoptera The Broad-bordered Five-spotted Burnet Moth – Zygana Trifolii

On Moth PhotoPlate IX (fig. 7) will be found a coloured representation of this Burnet. The two crimson spots in the base of the fore wing are very close together, and often touch. The same remark also applies to the two spots on the middle of the wing. A glance at the list of British Moths (Appendix I) will show that we have also a Narrow-bordered Five-spotted Burnet. This insect is very similar to the species now under consideration, but may be identified by the narrower purplish margin on the hind wings, and also by the shape of the antenna, which are not thickened so much near the end as they are in Trifolii.

The larva of the present species is yellowish or greenish, with a row of black spots on the back and a row on each side. It feeds on the bird’s-foot trefoil (Lotus corniculatus), hop trefoil (Trifolium procumbens), and the horse-shoe vetch (Hippocrepis comosa) in May. Late in May or in early June the chrysalis may be found in a silken cocoon attached to a stem or leaf; and the perfect insect flies during June and July.