Romaleosyrphus argosi Moran, 2021

Moran, Kevin M. & Skevington, Jeffrey H., 2021, Taxonomic revision of Romaleosyrphus Bigot (Diptera, Syrphidae), including descriptions of seven new species, ZooKeys 1075, pp. 1-32 : 1

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Romaleosyrphus argosi Moran

sp. nov.

Romaleosyrphus argosi Moran sp. nov.

Figures 5D View Figure 5 , 7D View Figure 7

Type locality.

Guatemala: San Marcos: Bojonal Rd., 1.3 km, 14.9333, -91.8667, 1600m.


Holotype female, pinned. Original label: "Guatemala: San Marcos // km 1.3, Bojonal Road // 14° 56'N 91° 52'W 1600m // 13-14. vii. 2001 DCH, DY" "Univ. Calif. Riverside // Ent. Res. Museum // UCRC ENT 66852" (UCRC).

Differential diagnosis. Scutellum white pilose. Tergite II extensively white pilose, except with black pile in posterolateral corners. Tergite III black pilose, except with mixed white pile anteromedially. Tergite IV black pilose.


FEMALE. Body length: 12.5 mm. Wing length: 8.1 mm.

Head. Face non-pruinose; gena black pilose anteriorly; anterior tentorial pit black pilose; frons, black pilose and brown pruinose; vertex black pilose and brown pruinose; postocular setae black; occipital setae black; antenna reddish orange.

Thorax. Matte black; postpronotum white pilose; scutum white pilose along margins and black pilose medially; scutellum white pilose; postalar callus white pilose; proepimeron black pilose; posterior anepisternum white pilose; katepisternum white pilose posteriorly with broadly separated patches; metasternum mixed black and white pilose; anepimeron with anterior portion white pilose; lower calypter with long black pile.

Legs. Coxae black; femora black except extreme apex of femora; remainder of legs reddish; fore and mid-coxae black pilose; hind coxa mixed black and white pilose; fore femur black pilose, except small mix of white pile basally; mid femur black pilose, but with stretch of white pile on posterior side; hind femur black pilose; tibiae and tarsi black pilose.

Wing. Microtrichia absent in following areas: cell c along margin of vein Sc running from 2/5 and ending at 4/5 of length of the cell, anterior 1/5 of cell r1, cell br except along spurious vein the part right below the start of cell r2+3, all of cell cua except extreme posterior, cell bm, cell cup along the margin of vein CuP in the anterior third of cell, cell m4 from cross-vein m-cu to end of vein M4 and in following regions of cell dm: anterior ¼, except extreme anterodorsal corner, ventral 1/3, and broad margin adjacent to vein M2.

Abdomen. Tergites shiny to subshiny black; tergite I with scattered, white pile medially, except with short black pile in lateral corners; tergite II with dense white pile which runs diagonally from anterolateral corner until it reaches the posterior margin at a point which is ca. at 1/3 width of the tergite, remainder of tergite is black pilose; tergite III with black pile except mixed white pile anteromedially; tergite IV with black pile; tergites not distinctly pruinose; sternites I-III white pilose and not pruinose; sternite IV black pilose; pile of postabdomen black.

MALE. Unknown.




Central American montane forests ecoregion.


Named Romaleosyrphus argosi , from the Greek argos (white), to highlight the coloration of this species. It is a noun in apposition.