Argentinomyia transversalis Montoya sp. nov.

Proposed standard English name: Transversal-spotted long-antennae flower fly.

(Figs 83 and 91C)

Type material. HOLOTYPE. Adult female, pinned, deposited at Colección Entomológica Universidad de Antioquia. Original label: “ COLOMBIA, Risaralda, Pereira, Santuario de Fauna y Flora Otún Quimbaya” / “Peña Bonita, El Jordán, 4,743 619, -75,524908, 2800 m ” / “Van Someren-Rydon (VSR) Viscera, 13.vi.2011, N. Uribe Leg. ” “HOLOTYPE / Argentinomyia transversalis / Montoya 2023” (CEUA 87110) . PARATYPES. BOLIVIA. La Paz, Sud Yungas nr Chulumani Apa reserve, 1° forest and shrubs, -16,197498, -67,71861, 2000 m, 4.i.2001, A.L. Norrbom (1♀, USNMENT 00055996) . COLOMBIA. Risaralda, Pereira, La Suiza, Santuario de Fauna y Flora Otún Quimbaya, 4,726 9, -75,58605, 1919 m, Van Someren-Rydon (VSR) Fish, 8.v.2001, Grupo Entomologia Universidad de Antioquia (1♀, CEUA 47456) .

Length (n= 3): Body, 7.2–7.9 mm; Wings, 7.2–7.7 mm.

Diagnosis. Face and thorax extensively white-grey pollinose and pilose; pro-, meso- and metafemur black, only yellow on apical 1/5 pro-, meso- and metatibia yellow on basal 1/3 or more, all tarsus orange-yellow; the 2 nd tergum with a broad yellow transversal fascia, extending from the base to the apical 3/4, slightly interrupted in the anterior middle edge; 3 rd tergum with a pair of triangular apically rounded maculae, touching each other toward the middle on basal edge and extending from the base to the apical 3/4, maculae on 4 th tergum similar but shorter, occupies only the anterior 1/4 of the tergum, slightly touching each other toward the middle on basal edge

Description. FEMALE. Head (Fig. 83A): Face black and somewhat brassy, whitish-grey pollinose and pilose. Facial tubercle at least with two slightly pronounced transversal grooves. Gena black, white-grey pollinose and pilose. Frontal triangle brownish-black pollinose, pile black. Ocellar triangle black pollinose and pilose. Occiput white pollinose and pilose. Antenna dark reddish-brown, short, ratio 1.2:1:2.5, basoflagellomere at least twice as long as the pedicel and scape combined; basoflagellomere blackish dorsal and reddish ventral; arista brownish, with few short piles. Thorax (Figs 83B–C): Mesonotum, scutellum and pleura black semiopaque, white pilose. Scutum with two whitish vittae on anterior half, reaching beyond the notopleural suture, white-grey pilose. Pleura shining black, white pollinose and pilose. Scutellum shining, slightly rugose on apical half, white pilose. Wing (Fig. 83C): Slightly brownish, stigma yellowish, microtrichose, except cell bm bare on basal 1/2, r only slightly bare on basal 1/4 or less, cell cua bare on anterior 1/2; calypter wholly yellowish-brown; plumula yellow-whitish; halter orange, capitulum orange. Legs (Fig. 83C): Brown to black, black pilose, pro-, meso- and metafemur black, only yellow on apical 1/5; pro-, meso- and metatibia yellow on basal 1/3 or more, tarsus orange-yellow. Abdomen (Fig. 83B): Black, 1 st tergum black shining, with long lateral yellowish pile; 2 nd tergum with a broad yellow transversal fascia, extending from the base to the apical 3/4, slightly interrupted in the anterior middle edge; 3 rd tergum with a pair of triangular apically rounded maculae, touching each other toward the middle on basal edge and extending from the base to the apical 3/4, maculae on 4 th tergum similar but shorter, occupies only the anterior 1/4 of the tergum, slightly touching each other toward the middle on basal edge; 5 th tergum entirely black.

Male. Unknown.

Etymology. The specific epithet “ transversalis ” is a Latin adjective referring to the broad transversal fascia on 2 nd tergum.

Geographical range. Argentinomyia transversalis sp. nov. (n= 3) is distributed in the western slope of Central Cordillera in Colombia (Risaralda) and Cordillera Oriental Sur in Bolivia (La Paz) (Fig. 91C). The species is present at middle and high altitudes (1919–2800 m) in the following domains and provinces: Northern Andes: Cauca (1919– 2800 m); Central Andes: Yungas (2000 m).