. Bulletin of the British Museum (Natural History) Entomology. SPECIES GROUPS OF PECT1NOPYGUS 205 is sometimes latero-dorsal on VI, is more usually positioned as one of the four pleural setae also found on segments VII and VIII in addition to the post-spiracular setae of those segments. It seems in a number of Ischnoceran genera that segments VI—VIII each have the same number of pleural setae (excluding the tricho- bothrium) and that the actual number may prove to be a supraspecific character in some cases (Tandan & Clay, in preparation), (c) Second instar nymphs, in which the tergal and p
. Bulletin of the British Museum (Natural History) Entomology. SPECIES GROUPS OF PECT1NOPYGUS 205 is sometimes latero-dorsal on VI, is more usually positioned as one of the four pleural setae also found on segments VII and VIII in addition to the post-spiracular setae of those segments. It seems in a number of Ischnoceran genera that segments VI—VIII each have the same number of pleural setae (excluding the tricho- bothrium) and that the actual number may prove to be a supraspecific character in some cases (Tandan & Clay, in preparation), (c) Second instar nymphs, in which the tergal and pleural plates on segments III—VIII are still separated or partially separated, have a seta each side lying approximately between these plates on VII-VIII and on VII well separated from other setae of the segment; these are assumed to be the post-spiracular setae of those segments. The lateral setae are either marginal or dorso- or ventro-lateral or just below the pleural plates and presumed to be pleural. The chaetotaxy of the terminal segments of the male abdomen provides important taxonomic characters. In the dispar group, as well as in the larger. 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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