Castiarina lycida Barker, new species (Figs 1 h, 2 h)

Type material: Holotype male, 43 km W Mitchell, Qld, 19.x.2000, on Hakea flowers, S. Barker & M. Powell, SAMA I 21 707.

Size. Holotype, 11.8 x 4.0 mm. Female unknown.

Description. Colour: Head dark blue with yellow reflections, mouth­parts blue. Antennomeres: 1–2 blue, 3–11 blue­green. Pronotum dark blue medially, lighter blue laterally. Scutellum black. Elytra red­brown with narrow blue narrow basal margin, black mark along suture gradually widening towards apex, expanded into pre­apical mark covering apex and spines. Ventral surface indigo. Legs blue. Setae silver.

Shape & Sculpture: Head closely punctured, deep median sulcus, moderately elongate mouthparts. Antennomeres: 1–3 obconic: 4–11 triangular. Pronotum closely punctured, anterior margin projecting medially, basal margin slightly bisinuate, with deep basal fovea each side at basal angle, impunctate median line from base to apex, laterally angled outwards from base, rounded before middle, tapered to apex. Scutellum scutiform, medially indented, impunctate. Elytra costate, intervals 3, 5, 7, 9 from suture raised, laterally rounded outwards from base, rounded at humeral callus, concave, then rounded medially and narrowed to bispinose apex, apical spine large, and blunt, sutural spine small, acute, margin rounded and indented between spines. Ventrally with shallow punctures, margins of abdominal segments glabrous, sparse, short setae, meso­ and metasternal areas inflated. Legs: tarsal claws elongate. S7 truncate in male.

Aedeagus: Parameres elongate, rounded apically; penis blunt (Fig. 1 h).

Remarks. This species is the only costate lycid mimic that has a relatively unsculptured pronotum, it belongs in the C. delta (Thomson) species group.

Distribution. Only known from the type locality west of Mitchell, Queensland.

Etymology. The species is named after its model Metriorrhynchus sp. ( Lycidae: Coleoptera).