. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 12 Annals of the South African Museum. homologous a non-committal terminology is adhered to throughout this revision. The chitinised structures (cf. text-fig. 2, a, b, and c of Bombylius lateralis, and of all the other text-figures of male genitalia in this paper), constituting the hypopygium, are usually composed of two basic, independently immovable, symmetrical, shell-like elements, one on each side, convex on one side and hollowed out on the other, which are throughout referred to as the basal pa
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 12 Annals of the South African Museum. homologous a non-committal terminology is adhered to throughout this revision. The chitinised structures (cf. text-fig. 2, a, b, and c of Bombylius lateralis, and of all the other text-figures of male genitalia in this paper), constituting the hypopygium, are usually composed of two basic, independently immovable, symmetrical, shell-like elements, one on each side, convex on one side and hollowed out on the other, which are throughout referred to as the basal parts (). These parts may correspond or be homologous to the so-called claspers or coxites _—--^ («) (b) (c) Text-fig. 2.—(a) Side view of hypopygium of $ of Bombylius lateralis F. (6) Ventral view, and (c) dorsal view of same. of some other Diptera, but in the Bombyliidae they are not segmentally attached externally to the terminal abdominal segments but are usually partially or completely enclosed by the visible last tergite and sternite. They may be considered as partially internal in position and, if homologous to claspers, as similar structures which have migrated inwards. These parts may be symmetrically and partially separated, and not entirely separate as in case of claspers, by a central groove-like impression or suture on the convex side, or they may be undivided, constituting a single structure. The apparently separate parts of the former type are, however, not independently movable. Towards the apical part each half, or the apical part of the undivided type, is usually narrowed into a sort of neck region, the inner or outer margins of which may be produced apically into an inner apical prominence or process (), or an outer process. The inner one. 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
