Argentinomyia rugosonasa ( Williston, 1891 )

Montoya, Augusto L. & Wolff, Marta, 2023, Taxonomic revision of the Neotropical genus Argentinomyia Lynch-Arribálzaga, 1891 (Diptera: Syrphidae), with description of 16 new species, Zootaxa 5234 (1), pp. 1-157 : 115-117

Argentinomyia rugosonasa ( Williston, 1891)

( Figs 2A, 4C, 9D, 69, 70 and 96A)

Melanostoma rugosonasus Williston, 1891: 13 . Type locality: Mexico. Guerrero, Omiltemi , 8000ft. HOLOTYPE Female

BMNH (Examined). Refs.: Fluke, 1945: 7 (redesc.) 26 ( Fig. 6, head, lateral view, male); 1957: 269 ( Figs 6, 15, male genitalia) 279 (Fig. 130, male genitalia); Thompson et al. 2010: 767 ( Fig. 23, head, lateral view, male) Rugonasus Aldrich, 1905: 361, Williston, 1907: 2, Coquillett, 1910 a: 601, misspellings. Rhysops rugonasus . Curran, 1937: 2 (key) misspellings Rhysops rugosonasus . Fluke, 1945: 7 Rhysops rugosonasus . Fluke, 1957: 266 Rhysops rugosonasus . Thompson et al. 1976: 44 Melanostoma rugosonasus . Papavero & Ibañez-Bernal, 2003: 166 Argentinomyia rugosonasus . Thompson et al. 2010: 767

Type material. HOLOTYPE. Adult female, MEXICO. Omiltemi , 8000ft, Guerrero, July, H.H. Smith ( BMNH) . PARATYPE. MEXICO. Mexico City, Omiltemi , 2600 m, vii-1936, H. G. Meyer (8♁, 1♀, BMNH) ; Guerrero, Xucumanatlan (Note: The correct writing of Xucumanatlan is“ Xocomanatlan ”and refers to the locality Xocomanatlan / Chilpancingo de Los Bravo ) 7000ft, July. H.H. Smith (1♀, BMNH) .

Length (n= 7): Body, 9.8–10.2 mm; Wings, 9.1–9.8 mm.

Diagnosis. Face vertical, flat, not produced downward, with at least six or seven transversal grooves, a large oval median shining vitta, the rest of face whitish pollinose; antennae elongate, scape and pedicel a little longer than basoflagellomere; notopleural tubercle very prominent; wings hyaline; protibia reddish to brownish-yellow; metafemur black or dark brown with long pile on outer sides, metatibia with about one-half dozens of longer brownish pile on outer sides; metabasitarsomere elongate, black or dark brown, not contrasting with the tibia and/ or rest of tarsus; abdomen elongate, opaque black, with metallic maculae more shining alongside and broadly on anterior corners of 3 rd and 4 th terga; surstylus triangular-like, shorter than broad.

Redescription. MALE. Head ( Figs 2A, 4C, 69A, 70D): Face moderately shining, submetallic black, flat, with a large oval median shining vitta, but the rest of the face is whitish pollinose. Face shining black, partly concealed beneath whitish pollen, which, on sides, is faintly striate; in middle, with well-marked, slender, about six or seven transversal grooves. Frontal triangle and vertex with a black opaque cross-band below ocelli. Ocellar triangle black with thin yellowish pollen, pile black. Antennae brownish, orange ventrally, short, ratio 1.7:1.0:2.5, scape and pedicel a little longer than basoflagellomere, basoflagellomere blackish in dorsal area, arista black, pilose. Thorax ( Figs 69B–C, 70D): Black, mesonotum moderately shining, brownish-steel-blue, yellow pilose; with two darker, not conspicuous, pollinose vittae on anterior half, pile yellow. Pleura thinly grayish-brown pollinose, yellow pilose. Scutellum steel-blue, pile short, with long yellow pile; fringe yellow; notopleural tubercle very prominent. Wing ( Fig. 69C): Hyaline, stigma yellow, microtrichose, except costal cell only slightly bare on basal 1/4, cells bm and r bare on basal 2/3 and 1/3, respectively, cell cua bare on anterior 1/3; calypter wholly brown; plumula white, halter orange, capitulum orange-brown. Legs ( Fig. 69C): Pro- and mesolegs reddish or brownish-yellow, femur and tarsus blackish basally; metafemur black, with long yellow pile on outer sides; metatibia and tarsus brown, except reddish-yellow basally, metatibia with about half a dozen of longer brownish pile on outer sides, metabasitarsomere elongate. Abdomen ( Figs 9D, 69B, 70D): Elongate, shining metallic bluish; 2 nd to 4 th tegum with a posterior black band extending more or less forward in middle, more shining along sides and broadly on anterior corners of 3 rd and 4 th terga; sterna black shining, yellow pilose; male genitalia: surstylus in lateral view ( Fig. 70A) triangular-like, shorter than broad; hypandrium in ventral view ( Fig. 70C) narrowed laterally towards the apex; aedeagal lobe in ventral view ( Fig. 70C) circular, apex rounded.

FEMALE ( Figs 64D–F, 65E). Similar to male except for usual sexual dimorphism and differing in the pile of legs is much briefer, with very few long hairs on femur and none on tibia.

Taxonomic notes. Argentinomyia rugosonasa is a dark species that can be easily differentiated from A. crenulata and A. sagoti sp. nov. by the presence of face vertical, flat, not produced downward, with at least six or seven transversal grooves, a large oval median shining vitta, the rest of face whitish pollinose; antennae elongate, scape and pedicel a little longer than basoflagellomere ( Figs 68A, C, D, F); notopleural tubercle very prominent; wings hyaline ( Figs 68 B-C, E-F); protibia reddish to brownish-yellow; metafemur black or dark brown with long pile on outer sides, metatibia with about one-half dozens of longer brownish pile on outer sides; metabasitarsomere elongate, black or dark brown, not contrasting with the tibia and/or rest of tarsus ( Figs 68A, C, D, F); abdomen elongate, opaque black, with metallic maculae more shining alongside and broadly on anterior corners of 3 rd and 4 th terga ( Figs 68B, E). In A. crenulata the face has seven or eight narrow, shallow, transverse grooves above the tubercle and sides of the face with a thin white line of pollen; antennae elongate, scape longer than pedicel and basoflagellomere, pedicel and basoflagellomere about equal in length ( Figs 26A, C, D, F); wings with two short medial transverse brown fasciae on anterior cross-vein ( Figs 26 B-C, E-F); metafemur and protibia black, black pilose ( Figs 26A, C, D, F); abdominal maculae metallic ( Figs 26B, E). In A. sagoti sp. nov. the face with four or more distinct transverse grooves above the tubercle; antenna short ( Figs 26A, C, D, F); wing lightly brown pigmented anteriorly; protibia yellow on basal 1/3 ( Figs 26 B-C, E-F); metafemur and tibia yellow on apically 1/3 ( Figs 26A, C, D, F); 2 nd to 4 th terga without maculae ( Figs 26B, E). Based on males, A. rugosonasa differs from A. crenulata and A. sagoti sp. nov. in having the surstylus in lateral view ( Fig. 69A) triangular-like [versus surstylus with dorsal and ventral margins approximately of the same width in the whole length in A. crenulata ( Fig. 27A); surstylus with dorsal margin slightly concave and ventral margin slightly convex in A. sagoti sp. nov. ( Fig. 72A)] (see “diagnosis” under each species or key).

Biology. Label data suggest that A. rugosonasa visits flowers of Helianthus salicifolius ( Asteraceae ).

Geographical range. Argentinomyia rugosonasa (n= 76) is distributed in Costa Rica * (Cartago, San José, Puntarenas) and Mexico (Chiapas, Desierto de los Leones, Guerrero, Toluca , Mexico City, Omiltemi ) ( Fig. 96A). The species is endemic to the Mesoamerican domain, mainly distributed at middle and high altitudes (1766–2990 m) in the provinces: Chiapas Highlands (2510 m) , Pacific Lowlands (2438–2600 m) and Puntarenas-Chiriquí (1766–2990 m) .

Non-type material examined. COSTA RICA. Cartago, 9,6, -83,7, 2438 m, vi.1996 (InBio); Puntarenas, Cerro Biolley, Estación Altamira , ACIA PILA, 9,076 418, -82,980144, 1766 m, 2.viii.1995, L. Donzo (1♀, INBioCRI 002251037, Cat. N. 5379); R.I. Ujaras, Salitre, Cabagra, Buenos Aires, 9,072 968, -82,909872, 2990 m, 19ix.2003, M. Alfaro, Libre (3♁, INBioCRI 0003753632; 3753633; 37553634, Cat. N. 74941) ; San José, Estación Cuerici, R. Negro, Mora, 9,537 281, -83,708056, 1800 m, 1.iv.1992, H. Vargas, F.G. Zumbado; M.A. Zumbado (1♁, INBioCRI 000409368); …, camino al sendero El Carbón 4, 6 km al E de Villa Mills, 9,564 652, -83,707899, 2600 m, 30.v.1996, A. Picado (3♁, INBioCRI 002466351; 2466353; 2394364; 2394365); 31.iii.1996, A. Picado (1♀, INBioCRI 002394362, Cat. N. 7028); …, límite de la Finca Cuerici, 3km E. Villa Mills , 9,564 652, -83,707899, 2800 m, 23.vi.1996, A. Picado (6♁, INBioCRI 002452405; 2452407; Cat. N. 7698, 7699, 5902); …, Rt 95 btw km 42-43, 1 km N La Cima near train overpass, sweeping Helianthus salicifolius , 8.viii.1989, A.L. Norrbom (1♁, 1♀, USNM ENT 01443825 ; 01443649); …, alrededores de la Estación, 9,564 652, -83,707899, 2600 m, 20.viii.1995, A. Picado (6♁, INBioCRI 002338183; 2338185) ; MEXICO. Chiapas, San Cristóbal de las Casas, L. C. Huitepec, 16,736 812, -92,637332, 2510 m, 26.ii.2011, P. Sagot (13♁, 5♀, ECO-TAP-E); …, 11.ii.2009, P. Sagot (1♁, ECO-TAP-E 1073 ); 8.viii.2009, P. Sagot (1♁, ECO-TAP-E 24469 ); 20.iii.2010, P. Sagot (1♀, ECO-TAP-E 24468 ); 12.x.2009, P. Sagot (1♁, ECO-TAP-E 24424 ); Mexico city, 19,431 447, -99,131481, 2675 m, 1.vii.1936, Meyer (2♁, 1♀, AMNH); …, (2♁, 2♁, IRC); Desierto de los Leones, 19,305 81, -99,303274, 2800 m, 7.vi.1961, George W. Byers (7♁, Berkeley University Collection); …, E. Toluca, 19,308 081, -99,680517, 2850 m, 31.vii.1962, U. Kansas Mexico exploración (2♁, 4♀, Berkeley University Collection) .