Coenosia albisquama Emden 1940, stat. nov.
Creators: name: Couri, Márcia
name: Pont, Adrian
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Muscidae
Coenosia
Coenosia albisquama

description: Coenosia albisquama (Emden, 1940: 233), stat. nov.
(Figs 47–49)
Holotype male seen; in good condition.
Diagnosis. General colour brown; posterior part of scutum and scutellum brown; head strikingly silvery in male, frons and fronto-orbital plate strongly silver pollinose and strongly dilated to vertex, face and parafacial also strongly silver; wing infuscated; no ocellar setae in males; postpedicel dark brown; calypters whitish; arista shorthaired basad and bare apicad; palpus brown; haltere with knob dark brown; presutural and postsutural acrostichals present, long and fine; scutellum with four strong setae and with only one pair of subbasal setulae; anterior katepisternal short; lower calypter about 1.8 times the length of the upper one; legs shining brown; hind tibia with an anterior and an anterodorsal seta, the latter a little shorter; submedian posterodorsal seta absent; sternite 5 as in Fig. 47.
Male terminalia. Cercal plate and surstylus as in Fig. 48. Aedeagal complex as in Fig. 49.
Notes. Included in the niveifrons group. Described by Emden (1940) as a subspecies of C. niveifrons Stein, 1913. In addition to colour differences in the scutum and calypter and the long and fine acrostichals present in C. albisquama, the morphology of the male terminalia also showed differences in the shape and chaetotaxy of sternite 5, cercal plate, surstylus and aedeagus both from C. n. niveifrons (Figs 101–103) and from C. niveifrons argentescens, also described by Emden as a subspecies and also elevated here to species rank. One paratype male was dissected and illustrated.
Coenosia argentescens (Emden, 1940: 234), stat. nov. (Figs 25–28; 50–52)
Holotype male seen (Figs 25–28); in good condition.
Diagnosis. General colour brown; scutum, scutellum and abdomen entirely silver pollinose; head strongly silvery in male, frons and fronto-orbital plate strongly silver pollinose and strongly dilated towards vertex in male, face and parafacial also strongly silver; wing infuscated; no ocellar setae in males; postpedicel dark brown; calypters whitish; arista short-haired basad and bare apicad; palpus brown; haltere with knob dark brown; presutural acrostichals absent; postsutural acrostichals very short and sparse; scutellum with four strong setae and with only one pair of subbasal setulae; anterior katepisternal short; lower calypter about 1.8 times the length of the upper one; legs shining brown; hind tibia with an anterior and an anterodorsal seta, the latter a little shorter; posterodorsal submedian seta absent. Sternite 5 as in Fig. 50.
Male terminalia. Cercal plate and surstylus as in Fig. 51. Aedeagal complex as in Fig. 52.
Notes. Included in the niveifrons group. Described by Emden (1940) as a subspecies of C. niveifrons Stein, 1913. The comments above under C. albisquama also apply here. In addition to the colour differences of scutum and calypter and the absence of presutural acrostichals, the morphology of the male terminalia also showed differences in the shape and chaetotaxy of sternite 5, cercal plate, surstylus and aedeagus both from C. n. niveifrons (Figs 101–103) and from C. niveifrons albisquama, also described as a subspecies and also elevated here to species rank. One paratype male was dissected and illustrated.
description: Published as part of Couri, Márcia & Pont, Adrian, 2016, Species of Coenosia Meigen (Diptera, Muscidae) described by Fritz van Emden from the British Museum Ruwenzori Expedition of 1934 – 1935, pp. 529-555 in Zootaxa 4144 (4) on pages 531-532, DOI: 10.11646/zootaxa.4144.4.5, http://zenodo.org/record/266732