Revision of the Neotropical hoverfly genus Peradon Reemer (Diptera, Syrphidae, Microdontinae) Author Reemer, Menno Author Skevington, Jeffrey H. Author Kelso, Scott text ZooKeys 2019 896 1 93 http://dx.doi.org/10.3897/zookeys.896.36493 journal article http://dx.doi.org/10.3897/zookeys.896.36493 1313-2970-896-1 3E0BC795B569442AAE6FDFD4A9FB9534 45D554E9BC5451AA8EFF6B8A14862ADC Peradon surinamensis Reemer sp. nov. Figs 76 , 77 , 87 , 89 , 91 , 93 , 139 , 140 , 246-251 , 278 Microdon flavofascium Curran: Van Doesburg 1966 : 80. Peradon flavofascium (Curran): Reemer 2014 : 43. Type material. Holotype . Suriname • 1 ♂, holotype of Peradon surinamensis sp. nov.; Coppename River, Raleigh Falls; 16 Jul. 1963; P.H. van Doesburg Jr. leg; RMNH. Label 1: "Suriname / Coppename Riv. / Raleigh Falls / 16 July 1963 / P.H. v. Doesburg Jr."; label 2: "Microdon [male symbol] / flavofascium Curr. / det. v. Doesburg"; label 3: "Peradon / cf. flavofascium / Det. M. Reemer 2016 / Voucher code MR033". Suriname • 1 ♀, paratype of Peradon surinamensis sp. nov.; Distr. Brokopondo, Brownsberg N.P., Witti Kreek; 20 Jul. -3 Aug. 2001; N. Grol & N. Marseille leg.; RMNH •1 ♀, paratype of Peradon surinamensis sp. nov.; Distr. Para, Colakreek, 5 km SE Zanderij; 05°27'58"N , 55°13'47"W ; 1 Mar. 2006; M. Reemer leg.; RMNH. Additional specimens. Brazil • 1 ♀; Rondonia, Vilhena; 13 Nov. 1986; C. Elias leg.; UFPR; 1 ♀; Amazonas ["Amazon / 66 53"]; NHMUK. Description (based on holotype). Adult male. Body size: 8 mm. Head . Face occupying approximately 0.45 of head width in frontal view; black except for pale yellow, oblique yellow maculae ventrolaterally; with white pilosity. Gena black; with white pilosity. Lateral oral margin weakly produced; black; with white pilosity. Frons and vertex black; with pale golden yellow pile pilosity. Occiput black; with pale golden yellow pilosity dorsally, white pilosity ventrally. Eye bare. Antennal fossa ca. as wide as high. Antenna brown. Ratio of scape:basoflagellomere approximately 1:1.1. Basoflagellomere parallel-sided with rounded apex. Arista slender, approx. 2/3 of length of basoflagellomere. Thorax . Mesoscutum dull black; short black pile, except for narrow fasciae of short pale golden yellow pile along anterior and posterior margin and transverse suture. Postpronotum brown; bare. Postalar callus blackish brown; yellow pilose. Scutellum black with faint blue green metallic shine, posterior margin yellow; white pilose; with two apical calcars of approx. 1/5 of length of scutellum, with mutual distance approximately equal to length of scutellum. Pleura blackish brown. Anterior and posterior part of anepisternum separated by deep sulcus; white pilose anteriorly and posteriorly, with wide bare area in between. Anepimeron entirely whitish pilose. Katepisternum white pile dorsally, bare ventrally. Other pleura bare (except for microtrichia). Calypter and halter yellow. Wing . Hyaline, except for pale yellow macula in basal half of cell r4+5, which anteriorly extends into cell r2+3 and posteriorly into cell dm; somewhat infuscated around crossvein r-m and posterior appendix of vein R4+5. Wing microtrichose, except bare on basal 1/2 of cell c, basal 1/4 of r1, basal 3/4 of br, basal 4/5 of bm, anterobasal 1/3 of cup, and most of alula (only microtrichose along margins). Legs . Shining brown; white pilose, except tarsi ventrally golden yellow pilose. Abdomen . Elongate, widest at apex of tergite 2, tergite 3 parallel-sided; blackish brown, tergite 4 somewhat paler; tergite 1 white pile; tergites 2 and 3 short black pile, except for longer silvery white pile laterally; tergite 4 silvery white. Sternites brown; white pile, except sternite 1 bare. Genitalia as in Fig. 278 . Female. As male, except for following differences. Body length 9 mm. Vertex black pilose medially. Pale wing macula a little more extensive anteriorly and posteriorly, and infuscation around crossvein r-m and posterior appendix of vein R4+5 more pronounced. Tergite 5 silvery white pilose. Diagnosis. Body length: male 8 mm, female 9-10.5 mm. A rather small species of Peradon with a yellow macula in the wing, silvery white pile on tergite 4 (and 5 in the female) and a bare postpronotum. These three characters are only shared with P. flavofascium , from which it differs as follows: alula only narrowly microtrichose along margins (bare for maximally 30% in P. flavofascium ), male with yellow wing macula extending to posterior part of cell r2+3 anteriorly, female with face occupying 0.45 of head width. See key for additional characters. Distribution. The species is known from Suriname, the Brazilian state Rondonia and an unknown locality in the Brazilian Amazon region. Etymology. The specific epithet is an adjective referring to Suriname, the country of origin of the type specimens.