. Bulletin of the British Museum (Natural History) Entomology. 252 L. LYNEBORG of pile on the first segment (see figures). Style comparatively long, two-segmented, ratio of the two sections variable; with an apical spine. Palpi one-segmented, narrow and of equal width throughout. Eye-facets of equal size; upper facets slightly enlarged in the males of some species, but never with a sharp line of demarcation between larger and smaller facets. Thorax. Mesonotum with 3 notopleural, 1-2 supraalar and 1 postalar setae. 0-2 pairs of dorsocentral setae. Scutellum always with 4 strong setae. Prosternu
. Bulletin of the British Museum (Natural History) Entomology. 252 L. LYNEBORG of pile on the first segment (see figures). Style comparatively long, two-segmented, ratio of the two sections variable; with an apical spine. Palpi one-segmented, narrow and of equal width throughout. Eye-facets of equal size; upper facets slightly enlarged in the males of some species, but never with a sharp line of demarcation between larger and smaller facets. Thorax. Mesonotum with 3 notopleural, 1-2 supraalar and 1 postalar setae. 0-2 pairs of dorsocentral setae. Scutellum always with 4 strong setae. Prosternum with long hairs on entire surface. Sternopleuron with long hairs on most of its surface, even on the ventral and anterior parts. Wings. Cell M3 open or closed. Cell i?4 rather wide towards apex, at most 2-2 times as long as wide between tips of veins Rt and Rb. Legs. Cxx and cx% with long hairs on anterior and posterior surfaces. All femora usually have anteroventral setae, but these may be absent on f1 and /2. T1 with anterodorsal, posterodorsal and posteroventral setae, and t2 and /3 with rows of setae in all four positions, anteroventral setae also present. All tibial setae comparatively long, usually as long as or longer than tibial 185 Figs 183-188. Irwiniella, heads in frontal view. 183, I. nuba, $; 184, I. nuba, $; 185, I. tomentosa, ^; 186, I. velutina, $; 187, I. natalensis, 9; 188, /. pallida, $. Scale: 0-5 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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