New genera of stiletto flies endemic to Madagascar (Therevidae: Therevinae) Irwin, Michael E. Winterton, Shaun L. European Journal of Taxonomy 2024 2024-04-19 932 1 1 33 Irwin & Winterton, 2024 Irwin & Winterton 2024 [567,837,264,291] Insecta Therevidae Rinhatiana Animalia Diptera 13 14 Arthropoda species latifestuca gen. et sp. nov.   urn:lsid:zoobank.org:act: 43F805DB-3FBE-4E56-B935-A4995BD93673  Figs 7–8, 9G–H, 15C, 16E–F, O, 18    Diagnosis Frons entirely matte black and silver pubescent, without tan pubescence dorsally ( Fig. 9G–H); male eyes nearly contiguous; single row of postocular macrosetae in both sexes; dorsocentral macrosetae absent; one pair of supra alar macrosetae ( Figs 7–8); abdomen yellow with silver pubescence laterally.   Differential diagnosis   Rinhatiana latifestuca gen. et sp. nov.differs from all other members of the genus by a distinctive pattern of frontal pubescence ( Fig. 9G–H) and predominantly yellow abdomen. Amongst other characters, it differs from  R. cracentis gen. et sp. nov.by the bright silver pubescence around the base of the antennae (silver-tan in  R. cracentis), from  R. distinctaby the presence of a single pair of supra alar macrosetae (two pairs in  R. distincta), and from  R. arctifestuca gen. et sp. nov.by the absence of tan pubescence dorsally on the frons (present in  R. arctifestuca). In addition, the matte black pubescence on the dorsal portion of the female frons is wider in this species than in that of  R. arctifestuca.    Etymology The specific epithet is derived from the Latin ʻ latusʼ (ʻbroadʼ) and ʻ festucaʼ (ʻstalkʼ). Gender is female.    Material examined    Holotype MADAGASCAR–  Tulear Province( Atsimo-Andrefana Region)• ♂; Ambohimahavelona; 23.4408° S, 43.8996° E;  45 ma.s.l.;  27 Dec. 2008–  2 Jan. 2009; M.E. Irwinand R. Harin’Halaleg.; Malaisein spiny forest dry wash; CASC.   Fig. 7.  Rinhatiana latifestuca gen. et sp. nov., ♂, paratype (CASC). A. Lateral view. B. Oblique view.    Paratypes MADAGASCAR–  Tulear Province( Atsimo-Andrefana Region)• 4 ♂♂, 3 ♀♀; same collection data as for holotype; various dates:  27 Dec. 2008– 2 Jan. 2009,  17–24 Nov. 2015,  27 Dec. 2015– 6 Jan. 2016; Malaise trapsin hillside wash and deciduous dry forest; CASC•  13 ♂♂, 10 ♀♀;  4 kmNof Manombo; 22.9036° S, 43.4755° E;  30 ma.s.l.; various dates:  12–27 Nov. 2001,  3–13 Oct. 2002,  8–19 Feb. 2002,  6–17 Mar. 2003,  2–12 Oct. 2003,  14–28 Nov. 2002; M.E. Irwinand R. Harin’Halaleg.; Malaisein Mikea deciduous dry forest; CSCA•  2 ♂♂, 2 ♀♀;  4 kmNNWof Manombo; -22.9133, 43.4821;  37 ma.s.l.;  6–17 Jan. 2002; M.E. Irwinand R. Harin’Halaleg.; Malaisein spiny forest; CASC•  1 ♂;  5 kmSEof Manombo; 22.9863° S, 43.5022° E;  17 ma.s.l.;  20–30 Oct. 2008; M.E. Irwinand R. Harin’Halaleg.; Malaiseon path in dense forest; •  1 ♀;  3 kmEof Itampolo; 24.6578° S, 43.9562° E;  45 ma.s.l.;  18– 27 Mar. 2010; M.E. Irwinand R. Harin’Halaleg.; Malaiseacross path in Androimpano dry forest; CASC•  1♂, 1♀;  27 kmNof Tongobory; 23.3461° S, 44.3581° E;  289 ma.s.l.;  22–30 Oct. 2008; M.E. Irwinand R. Harin’Halaleg.; Malaisein damp wash with spiny scrubland; CASC. –  Tulear Province( Androy Region)• 2 ♂♂, 1 ♀;  5 kmNof Ampotaka; 25.0303° S, 44.6915° E;  86 ma.s.l.;  27 Oct.–5 Nov. 2008; Malaiseon trail on Vitambany gallery forest; CASC.  Other material   MADAGASCAR–  Tulear Province( Atsimo-Andrefana Region)• 27 ♂♂, 19 ♀♀; Ambohimahavelona; 23.4408° S, 43.8996° E;  45 ma.s.l.; various dates:  27 Dec. 2008– 2 Jan. 2009,  17–24 Nov. 2015,  27 Dec. 2015– 6 Jan. 2016; M.E. Irwinand R. Harin’Halaleg.; Malaise trapsin hillside wash and deciduous dry forest; CASC.    Description BODY LENGTH. 5.5–7.0 mm (male), 6.5–8.0 mm (female). HEAD. Frontal pubescence with matte black band medially, extending dorsally and ventrally (female), matte black dorsally (male), silver ventrally; male frons width at narrowest point with eyes nearly contiguous; frontal vestiture absent; ocellar tubercle gray pubescent, without setae; black postocular macrosetae in single row immediately laterad of ocellar tubercle in both sexes; occiput pubescence silver-gray, brown suffusion medially; genal setae pale; antennal scape shorter than flagellum, cylindrical, dark yellow-orange, overlain with gray pubescence, sparsely covered with short, dark macrosetae; flagellum conical, tapered distally, style elongate, orange-yellow, terminus dark.   Fig. 8.  Rinhatiana latifestuca gen. et sp. nov., ♀, paratype (CASC), lateral view.   Fig. 9.  Rinhatianaspp., heads, anterior view. A.  Rinhatiana arctifestuca gen. et sp. nov., ♂ (CSCA). B. Same, ♀ (CSCA). C.  Rinhatiana cracentis gen. et sp. nov., ♂ (CSCA). D. Same, ♀ (CSCA). E.  Rinhatiana distincta( Lyneborg, 1976) comb. nov., ♂ (CSCA). F. Same, ♀ (CSCA). G.  Rinhatiana latifestuca gen. et sp. nov., ♂ (CSCA). H. Same, ♀ (CSCA). THORAX. Scutum uniform gray-tan or with brown markings, sparse short pale setae; scutellum concolorous with scutum; pleuron with dense silver-gray pubescence, darker in male; katatergite setae pale; scutal and scutellar macrosetae black; coxae yellow, overlain with silver-gray pubescence, minor setae white, macrosetae black, few in number; femora yellow, short dark setae admixed with longer pale setae and white adpressed scale-like setae, especially on hind leg; hind femur with single subapical anteroventral macroseta, subapical series of short posteroventral macrosetae; tibiae yellow, dark gray-brown suffusion apically, darker on hind leg; tarsi brown; wing smoky infuscate; venation yellow basally along major veins, darker distally; scutal chaetotaxy (pairs): notopleural, 3; supra alar, 1; post alar, 1; dorsocentral, 1; scutellar, 2. ABDOMEN. Male dark yellow, silver velutum present posterolaterally on tergites 1–5 inboth sexes, pale elongate setae, darker on posterior segments and terminalia in male, female abdomen dark yellow, intersegmental membrane distinctly pale, especially on tergite 2; terminalia dark yellow in both sexes. MALE GENITALIA. Epandrium quadrangular, strongly arched along midline; gonocoxites with elongate macrosetae laterally; outer gonocoxal process well developed and narrowly subtriangular; ventral lobe elongate, membranous apically; gonostylus narrow; distiphallus very narrow and recurved; sternite 8 sub-quadrangular, emarginate medially, setae along posterior margin.    Remarks   Rinhatiana latifestuca gen. et sp. nov.is very similar in appearance to  R. arctifestuca gen. et sp. nov., especially in the frontal pubescence pattern. This species appears restricted to southern Madagascarwhere it has been collected in spiny thicket habitats ( Fig. 18; inset). 4847526321 spiny forest dry wash 2008-12-27 2009-01-02 2008-12-27 Malaise CASC M. E. Irwin & R. Harin'Hala Madagascar 45 -23.4408 Ambohimahavelona 7 43.8996 Atsimo-Andrefana Region 13 14 1 1 Tulear Province holotype 4847526310 hillside wash and deciduous dry forest 2015-11-17 2015-11-24 2015-11-17 Malaise traps CASC M. E. Irwin & R. Harin'Hala Madagascar 45 -23.4408 Atsimo-Andrefana Region 7 43.8996 Atsimo-Andrefana Region 14 15 7 3 4 Tulear Province paratype 4847526332 Mikea deciduous dry forest 2001-11-12 2003-10-12 2001-11-12 Malaise CSCA M. E. Irwin & R. Harin'Hala 30 -22.9036 Manombo 7 43.4755 14 15 23 10 13 paratype 4847526327 spiny forest 2002-01-06 2002-01-17 2002-01-06 Malaise CASC M. E. Irwin & R. Harin'Hala 37 -22.9133 Manombo 7 43.4821 Manombo 14 15 4 2 2 paratype 4847526329 path in dense forest 2008-10-20 2008-10-30 2008-10-20 Malaise M. E. Irwin & R. Harin'Hala 17 -22.9863 Manombo 7 43.5022 14 15 1 1 paratype 4847526309 Androimpano dry forest 2010-03-18 2010-03-27 2010-03-18 Malaise CASC M. E. Irwin & R. Harin'Hala 45 -24.6578 Itampolo 7 43.9562 Itampolo 14 15 1 1 paratype 4847526328 damp wash with spiny scrubland 2008-10-22 2008-10-30 2008-10-22 Malaise CASC M. E. Irwin & R. Harin'Hala 289 -23.3461 Tongobory 7 44.3581 14 15 2 1 1 paratype 4847526319 Vitambany gallery forest 2008-10-27 2008-11-05 2008-10-27 Malaise CASC 86 -25.0303 Ampotaka 7 44.6915 Androy Region 14 15 3 1 2 Tulear Province paratype 4847526306 hillside wash and deciduous dry forest 2015-11-17 2015-11-24 2015-11-17 Malaise traps CASC M. E. Irwin & R. Harin'Hala Madagascar 45 -23.4408 Ambohimahavelona 7 43.8996 14 15 46 19 27 Tulear Province