Description of six new large species of Argentinomyia Lynch-Arribalzaga, 1891 and redescription of Talahua fervida (Fluke, 1945) (Diptera, Syrphidae, Syrphinae) Author Montoya, Augusto L. Grupo de Entomologia, Universidad de Antioquia, Calle 67 # 53 - 108, Medellin, Colombia https://orcid.org/0000-0003-3307-034X guto.spider@gmail.com Author Wolff, Marta Grupo de Entomologia, Universidad de Antioquia, Calle 67 # 53 - 108, Medellin, Colombia https://orcid.org/0000-0002-3389-7083 text ZooKeys 2020 929 19 51 http://dx.doi.org/10.3897/zookeys.929.37666 journal article http://dx.doi.org/10.3897/zookeys.929.37666 1313-2970-929-19 33EAB9576453425ABE3DD382B8F155D0 076E5368430653A4AD418807020D26D7 Argentinomyia talamanca Thompson sp. nov. Figure 10 , 11 , 16 Differential diagnosis. Antenna brown, rounded, as long as wide; face opaque, white pollinose and pilose. Wing, alula and, costa cell extensively microtrichose, except for extensive bare areas on basal half (cells, sc, r1, dm, and bm); costal cell brownish, calypter and border whitish, fringe plumula and, halter yellow, knob white. Femora and tarsi extensively brown. Abdomen, second tergum with a pair of small narrow maculae reaching basal 1/5; third and fourth tergum with basomedial maculae, reaching 2/5 and 1/5, respectively; fifth sternite black pilose. Argentinomyia talamanca sp. nov. is similar in appearance to Argentinomyia puntarena sp. nov., but in A. puntarena sp. nov. the antenna is orange ventrally, oval, longer than broad; costal cell hyaline, bare basally; alula bare medially; pro- and mesofemur yellow; metafemur orange on basal 1/5 and apical 3/5; pro-, meso- and metabasitarsomere I-II yellow; second tergum with a broad maculae reaching the apical 1/3; third tergum with a broad macula, short in the fourth; sternite fourth to fifth black pilose (see 'diagnostic features' under each species or key). Type locality. Costa Rica, department of Cartago, Rio Macho muncipality, Estacion Ojo de Agua, 9°36'2.23"N , 83°45'43.31"E , 3000 m a.s.l. Description. Male. Head (Fig. 10A, C ). Black, covered with white pollinosity, oral tips, ocellar triangle, and a large triangular macula on the front, brown pilose, pile on front black, on gena and face white pilose, on ocellar triangle black pilose, on the occiput white except the dorsal pile, which are black, frontal triangle golden metallic; face with a carina above the tubercle. Antennae brown, rounded, as long as wide, ratio 1.1:1.2:2; arista orange, dark brown toward the tip. Thorax (Fig. 10B, C ). Black, the scutum shining, with iridescent to opaque reflections, with two median brownish pollinose vittae on anterior half. Wing (Fig. 10D ). Slightly smoky, the stigma brown, membrane extensively microtrichose, except for extensive bare areas on basal half (cells, sc, r1, dm, and bm); costal cell brownish, extensively microtrichose; tegula black pilose, basicosta yellow pilose, alula extensively microtrichose; calypter whitish, border whitish, fringe yellow, plumula yellow, halter yellow, knob white. Legs (Fig. 10C ). Dark brown, pro- and mesofemur brown, orange on apical 1/8; metafemur extensively brown; pro and mesotibiae orange with a brown macula on posterior medial edge, metatibia extensively brown, only orange brownish on basal 2/3; tarsi brown, only meso-basitarsi orange basally, the pile yellow, black on the metatibia and above on the tarsi. Abdomen (Fig. 10B ). Elongate, black, first tergum shining black, second with a pair of small narrow maculae, occupying 2/5 of segment length, third and fourth with basomedial maculae, reaching 2/5 and 1/5, respectively. Pile orange on the sides basally, black down the middle and on the apical terga, as well as in the maculae; sternite IV black pilose. Male genitalia as Fig. 11 . Female. (Fig. 10D-F ). As male, except for usual sexual dimorphism and following differences: frons with a pollinose transversal macula below. Abdomen with a pair of square-like and apically rounded maculae on the second tergum, which occupies the anterior half of the tergum and comparatively larger than in the male. Profemur extensively yellow on anterior half. Female of Argentinomyia talamanca is similar in appearance to Argentinomyia puntarena sp. nov. but in A. puntarena the antenna is orange ventrally; alula and costal cell bare; pro, meso- and metabasitarsomere I-II yellow; second tergum with a lateral macula reaching the 5/6 of tergum length. Length ( N = 4). Body 10.5-11.4 mm; wing 9.2-9.8 mm. Etymology. The noun in apposition ' Talamanca ' refers to the cordillera where the species was collected in Costa Rica. Distribution. Argentinomyia talamanca sp. nov. ( N = 21) is distributed through the Talamanca Cordillera in Costa Rica (Cartago, Limon , Puntarenas, San Jose ) at an elevation between 2400 to 3600 m. a.s.l. in the province of Puntarena-Chiriqui (Fig. 16 ). Type material. Holotype . COSTA RICA ♂ , Cartago , Rio Macho , Estacion Ojo de Agua. Original label: "Costa Rica, Cartago, Rio Macho, Estacion Ojo de Agua, 9°36'2.23"N , 83°45'43.31"E , (L.S. 396700_482200), 3000 m a.s.l., 25.vii.1999 , A. Pinto Leg. , #62964 ( INBio 003321800 )". "HOLOTYPE / Argentinomyia talamanca / Thompson 2020" [red, handwritten except first line]". The holotype is in good condition and deposited at the INBio museum, in Costa Rica. "Identified as Xanthandrus 75-10 by Thompson 1971". Paratypes. COSTA RICA• 1♂, Cartago, Rio Macho, Estacion Ojo de Agua, A orillas de la carretera Interamericana, 9°36'2.23"N , 83°45'43.31"E , (L.S. 396700_482200), 3000 m a.s.l., 25.vi.1999, A. Pinto. Libre, #46825 (INBio 0003321799); same data except: 1♂, 26.vi.1997, B. Gamboa #62964, (INBio 0002566220); 1♀, #46825 (INBio 0002566223); 1♀, 9°35'5.48"N , 83°44'14.01"E , 2850 m a.s.l., 11.xii.1997, E. Alfaro, #48829 (INBio CRI002525323); 1♀, Sendero a Torre 47, 9°35'44.84"N , 83°44'37.94"E , 2960 m a.s.l., 26.iii.1997, A. Picado, #45541 (INBio CRI002537729); 1♂, Sendero a Torre 46, 2760 m a.s.l., 9°33'4.23"N , 83°43'45.13"E , 12.iv.1997, B. Gamboa, #46759 (INBio CRI002565331); 1♂, Cartago, Estacion Cuerici , El mirador, 4km al E. Villa Mills, Subparamo, 9°31'6.97"N , 83°33'12.55"E , 2900 m a.s.l., 7.xii.1996, A. Picado, #45170 (Collector # 489, 900-093) (INBio CRI002462385);, 1♀, #45170 (INBio CRI002462383); 1♀, sendero Cerro Cuerici , Limite P.N. Chiripo, 9°31'24.05"N , 83°30'15.03"E (L.S. 396700_482200), 3050 m a.s.l., 5.i.1996, A. Picado, #6799 (INBio CRI002367564); 1♂, camino la Auxiliadora, 3.5km E de Villa Mills, 9°32'47.29"N , 83°42'31.97"E , 2700 m a.s.l., 8.vii.1996, A. Picado, #7721 (INBio CRI002467120); 1♂, Cartago, Cerro Uran , 9°30'5.70"N , 83°30'56.31"E , 3600 m a.s.l., 1.v.1997, A. Picado, #46214 (INBio CRI002504307); 1♂, Limon , La Amistad, Bratsi, Cerrito en Fila Dudu-Apri, 9°16'12.31"N , 83°2'53.69"E (L.S. 356400_566000), 3100 m a.s.l., 23.vi.2000, Manual, A. Picado, #59164 (INBio 000311588); 1♂, sendero Circular, 9°17'44.79"N , 83°2'35.59"E (L.S. 340258_577465), 2406 m a.s.l., 20.vi-5.vii.2003, Libre, D. Rubi, #74159 (INBio 0003724228); 1♂, #74159 (INBio 0003724233). Puntarenas, 5 km, S. Rincon , 15.iii.1973, E.W. Barrows (1♀); 1♀, San Jose , Barva, i.1997, FCT group (USNM ENT 00036927); 1♂, San Jose , Estacion Cerro de la Muerte, Km 92, Carretera Interamericana, 9°34'22.79"N , 83°44'45.87"E (L.S. 390300_491700 #57449), 3140 m a.s.l., 24.iii.2000, M.A. Zumbado (INBio 0003168749); 1♂, San Jose , Cerro de la Muerte, 6 km, W. Villa Mills, Inter-Am. Hwy., 9°34'30.93"N , 83°37'47.69"E , 3340 m a.s.l., on flower of Compositae , 2.v.1972, E. R. Heithaus (Collector # 489, 900-093) (INBio 15810, dissected); on flower of Rosaceae , 25.viii.1971, E. R. Heithaus (Collector # 830) (1♀, INBio 4788, identified as Xanthandrus 75-10 Thompson); 1♂, San Jose , Los Santos, Camino a Providencia de Dota, 9°37'0.44"N , 83°50'19.14"E , 2900 m a.s.l., 18.i.1997, M. Segura, #45294 (INBio CRI002535232); 1♂, San Jose , PamAn Hwy, Km 89, Cerro de la Muerte, Las Torres, 9°34'N , 83°45'E , 3367 m a.s.l., 18-19.viii.1995, A.L. Norrbom (USNM ENT 00036926). Figure 10. Argentinomyia talamanca sp. nov., male (USNM ENT 00036926): A head, frontal, male B dorsal view C lateral view. Female (INBio CRI002462383): D head, frontal view E dorsal view F lateral view. Scale bars: 5 mm. Figure 11. Argentinomyia talamanca sp. nov., male genitalia: A whole genitalia including epandrium, cercus, and surstylus, lateral view B epandrium, dorsal view C hypandrium, ventral view. Scale bar: 0.05 mm. Comments. Argentinomyia talamanca sp. nov. is only known from the Talamanca Cordillera in Costa Rica.