Peradon luridescens (Walker)

Reemer, Menno, Skevington, Jeffrey H. & Kelso, Scott, 2019, Revision of the Neotropical hoverfly genus Peradon Reemer (Diptera, Syrphidae, Microdontinae), ZooKeys 896, pp. 1-93 : 1

Peradon luridescens (Walker) Figs 69 , 132 , 133 , 212-215 , 274

Ceratophya luridescens Walker, 1857: 151. Holotype ♀: Amazon (NHMUK). [examined]

Microdon luridescens (Walker): Thompson et al. 1976: 65.

Peradon luridescens (Walker): Reemer and Ståhls 2013a: 146; Reemer 2014: 44.

Studied type specimens.

Amazon Region • 1 ♀, holotype of Ceratophya luridescens Walker; NHMUK. Label 1 (round, red-bordered): "Holo- / type"; label 2 (round, green-bordered): “Type”; label 3: “Amaz”; label 4: "luridescens Wlkr"; label 5: "Ceratophya / luridescens. / Wlk.".

Additional specimens.

Brazil • 1 ♂; Acre, 15 km SE Rio Branco, Emprapa; 10°01'S, 67°41'W; 9 Jul.2008; G. Melo leg.; UFPR • 1 ♂; Roraima, Rio Uraricoera, Ilha de Maraca; 2-18 May 1987; Rafael leg.; INPA • 1 ♂; Amazonas, R. Campina; 22 Jan. 1987; F.J.A. Peralta leg.; INPA • 1 ♀; Rondonia, 62 km S Ariquemes, Fazenida Rancho Grande; 10.53°S, 62.80°W; 19-29 Sep. 1996; B. Harris leg.; LACM • 1 ♂; Pará, Canindé, Rio Gurupí; May 1963; B. Malkin leg.; MZUSP • 1 ♀; Amazonas, Manaus; 20 Sep. 2001; J.A. Rafael & J.F. Vidal leg.; INPA • 1 ♀; Amazonas, Resex Unini, Rio Unini, Lg. Galomanha, Terra Firme; 13-28 Jul. 2004; M.L. Oliveira, L. Aquino & A. Silva-Filho leg.; INPA.

Peru • 1 ♂; Madre de Dios, Rio Tambopata Reserve, 30 air km SW of Puerto Maldonado; 1-26 Nov. 1982; E.S. Ross leg.; CAS • 1 ♂; Madre de Dios, Rio Tambopata, Sachavacayoc centre, main trail, mal. trap; 12°51'46.4"S, 69°21'46.6"W; 16-24 Mar. 2011; J.T. Smit; JTS. SURINAME • 1 ♀; Brownsberg; 14 Sep. 1938; D.C. Geijskes leg.; RMNH • 1 ♂; Lely; 30 Oct. 1979; G.F. Mees leg.; RMNH • 2 ♂; Nason; 19 Mar. 2006; M. Reemer leg.; RMNH • 2 ♂; Nassau Mts.; 23 Mar. 2006; M. Reemer leg.; MZH & RMNH • 3 ♂; Nassau Mts.; 24 Mar. 2009; M. Reemer leg.; RMNH.

Diagnosis.

Body length: male 13-15 mm, female 16 mm. A large species with elongate, unconstricted abdomen. Tergite 2 has a pair of large yellowish maculae, while both tergites 3 and 4 are entirely dark brown (at least tergite 3 is yellowish brown in the otherwise very similar P. angustiventris ). The wings are yellow anterobasally, the fascia of golden pile along the mesonotal transverse suture is complete (not interrupted medially), and the face is entirely yellow. Male genitalia as in Fig. 274 .

Notes.

This species is closely related to P. angustiventris and the (colour) character used here to distinguish between them may not be sufficient. The male genitalia are very similar as well. For further notes see P. angustiventris . The colour of the scutellum seems to divide the available specimens of P. luridescens into two more or less discrete groups: in some the scutellum is entirely yellow, while in other specimens it is black with a greenish metallic hue, leaving only the margins narrowly yellow. In males with a dark scutellum the wings tend to be more extensively yellow towards the apex than in males with a yellow scutellum. In all studied females, the yellow colouration of the wing extends all the way to the wing apex, except in one specimen (Brazil, Manaus, 5-8.II.2005), in which it does not reach further than crossvein rm.

Distribution.

Known from the Brazilian states Acre, Amazonas, Pará, Rondonia, Roraima, from Amazonian parts of Peru, and from Suriname.

Figures

Figures 67 - 73. 37 - 39 Abdomen in dorsal view 67 P. costaricensis male (holotype) 68 P. aurifascia male (Brazil CSCS) 69 P. luridescens male (Suriname RMNH) 70 Face of P. aurifascia male (holotype). Note smooth and bare median vitta 71 Tergite 4 of P. aurifascia in lateral view. Note reddish apical margin 72, 73 Scutellum: 72 P. angustiventris female (Brazil INPA) 73 P. angustus male (neotype).

Figures 129 - 135. Dorsal habitus of Peradon species (bidens group) 129 P. angustus ♀ neotype 130 P. angustiventris ♂ Suriname RMNH 131 P. angustiventris ♀ Brazil Manaus INPA 132 P. luridescens ♂ Suriname RMNH 133 P. luridescens ♀ Suriname RMNH 134 P. aurifascia ♂ Brazil CSCA 135 P. aurifascia ♀ Brazil MZUSP. Scale bar: 10 mm.

Figures 212 - 217. 212 - 215 Peradon luridescens female, holotype: 212 habitus dorsal 213 habitus lateral 214 head frontal 215 head lateral 216, 217 Peradon niger male, holotype: 216 habitus dorsal 217 head frontal.

Figures 274 - 279. Male genitalia of Peradon species 274 P. luridescens Suriname RMNH 275 P. angustiventris Suriname RMNH 276 P. palpator holotype 277 P. flavofascium holotype 278 P. surinamensis holotype 279 P. notialus holotype.