Zeuzera pyrina (Linn.) Leopard Moth p55. Resident, widespread and locally common. Cossus cossus (Linn.) Goat Moth p55. Resident, formerly widespread, now local and extremely scarce. ZYGAENIDAE Burnets and foresters are small to medium-sized day-flying moths with metallic colours. They drink frequently, mainly from composite type flowers. The antennae of burnet moths are clubbed (resembling butterflies in this respect). Burnets and foresters have a well-developed frenulum on the hindwing and the wings beat quickly, although the flight is slow and buzzing. The larvae are short, stout and slightly hairy. Each species is monophagous or oligophagous (that is restricted to one, or a few related, species of foodplant) on broad-leaved plants of open grasslands. The larval stage overwinters. The burnet moth larva spins a papery cocoon, usually on grass-stems, and the active pupa breaks through the cocoon immediately before the moth emerges. Four of the nine British species have been recorded in Essex although two of these are probably now extinct in the county. Adscita statices (Linn.) (Procris statices) The Forester p53. ?Resident, very local and rare; no record since 1971 (see Guide). Zygaena filipendulae Linn. Six-spot Burnet p53. Resident, widespread and locally common. Zygaena trifolii (Esp.) Five-spot Burnet p5 2. Formerly local or very local resident; now probably extinct. Tremewan (1980) has stated that subspecies decreta Verity is, in all probability, extinct in S.E.England. He lists records (including two Essex ones) based on specimens in the BMNH collections, but has mostly disregarded those from the literature "'because of the difficulty which many lepidopterists have in distinguishing trifolii from Z. lonicerae (Scheven) ".The Essex records are: 49 Epping, undated and 58 Rainham, 1922. All other Essex records (including those given in the Guide) should be regarded as unconfirmed. Subspecies palustrella Verity has never been recorded from Essex. Zygaena lonicerae (Schev.) Narrow-bordered Five-spot Burnet p53. Resident, widespread and locally common. The Guide described this species as local, but it has since been recorded in a number of additional localities and is clearly extending its range (Tremewan, 1980). LIMACODIDAE A family with only two British species both of which have been found in Essex although only one is now resident. These small day-flying moths lack a haustellum. The slug-like larvae feed on the leaves of oak (and a few other species of tree in the case of the triangle). The larva spins a cocoon on a leaf but delays becoming a pupa until winter is over. 39