. Bulletin of the Natural History Museum Entomology. apical dot median fascia. terminal strigulae apical dot dorsal spot costal spots Fig. 52. Main types of opostegid forewing patterns with terminology used. Mandibles absent. Maxillary palpi five-segmented, spined at apex. Haustellum greatly reduced, but some- times exceeding length of maxillary palpus. Labial palpi three-segmented, much shorter than maxillary palpi. Ocelli and chaetosemata absent. Compound eyes large (but small in Notiopostega), occasionally only moderately large. Antennae long, but never as long as forewing. First segment of
. Bulletin of the Natural History Museum Entomology. apical dot median fascia. terminal strigulae apical dot dorsal spot costal spots Fig. 52. Main types of opostegid forewing patterns with terminology used. Mandibles absent. Maxillary palpi five-segmented, spined at apex. Haustellum greatly reduced, but some- times exceeding length of maxillary palpus. Labial palpi three-segmented, much shorter than maxillary palpi. Ocelli and chaetosemata absent. Compound eyes large (but small in Notiopostega), occasionally only moderately large. Antennae long, but never as long as forewing. First segment of antenna (scape) greatly enlarged, even more so than in Nepticulidae, the sister group, forming eye-cap which can entirely cover the eye (Fig. 51) (but small in Notiopostega). Antennal pedicel moderately short. Flagellum with 40-90 more or less cylindrical segments; most flagellomeres each with (among other types of sensilla) three palmately branched sensilla ascoidea, each with four to ten 'arms' (Davis, 1989). Thorax and appendages. Tegulae small. Thorax depressed dorso-ventrally. Tegulae and thorax scales usually very similar to ground colour of forewing. Forewing relatively broad, without sexual dimorphism in colour or scaling (in contrast to Nepticulidae, in which many have specialized sex scales). Forewing ofboth sexes with only scattered remnants of microtrichia, predominantly in subcostal region and along underside of hind margin of forewing base. Microtrichia forming usually well defined, distinctive colour patches (Fig. 12), especially in Opostegoides. Most of forewing underside surface covered with brown or cream scales. Upperside of forewing with varying patterns of a few simple types (Fig. 52). Forewings of most species white to silvery-white with brown termi- nal strigulae and often with additional dorsal and/or costal spots; some species with broad, dark (usually brown) fascia on forewing (occasionally even two or three fasciae, including apical area); a few spec
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