What Bug Is That? The guide to Australian insect families.

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The adults can usually be recognised by the axial condition of Rs of the hind wing, and the spinose gnathos in the male. The larva of Cosmiotes synethes pupates in a flimsy cocoon. It mines in the leaves of grasses, and has been reared from wheat. The known pupae of Australian species referred to Elachista are without a cocoon. [Traugott-Olsen and Nielsen 1977.]


Very small; head smooth-scaled; ocelli present or absent; scape sometimes with pecten; proboscis rarely vestigial; maxillary palps 1- or 2-segmented; labial palps recurved, porrect or drooping; hind tibiae usually with long hair-scales; fore wing lanceolate, R 5 to costa; hind wing lanceolate, Sc+R 1 remote from Rs which extends in a nearly straight line through or near axis of wing, cell usually closed; female with frenulum of 2 bristles; abdomen rarely with dorsal spines; gnathos usually with 1 or 2 spinose knobs. Larva with crochets uniordinal, rarely biordinal, in complete or broken circle, or transverse bands; leaf- or stem-miners, usually in grasses or sedges. Pupa usually with protuberances and exposed, abdomen without movement, attached by cremaster and central girdle, sometimes in flimsy cocoon.