Romaleosyrphus bigoti Moran sp. nov.

Figures 3A, 4F, 6F, 9B, 10B, 11E

Type locality.

Mexico: Chiapas: San Cristóbal de las Casas, Huitepec, 16.7603, -92.6814, 2560m.

Types.

Holotype male, pinned. Original label: "Mexico-Chiapas // San-Cristobal-de-las-Casas // Huitepec Alt: 2560m. // N16°44 ’35”/W92°41’17” // 9-02-2009 // SAGOT P. n°7" " Diptera - Brachycera // Syrphidae // Criorhina sp. 1 // Male // Coll. SAGOT P. n°1016 " "J. Skevington // Specimen # // 52561" (ECO-TAP-E).

Differential diagnosis. Scutellum yellow pilose. Tergite II completely yellow pilose. Tergite III black pilose. Tergite IV black pilose. Male hind tibia as in Fig. 9B. Male genitalia as in Fig. 11E.

Description.

MALE. Body length: 15.2 mm. Wing length: 10.5 mm.

Head. Face shape as in Fig. 10B; face gold pruinose; gena black pilose posteriorly; anterior tentorial pit variable pilose: yellow or black; frons broad, ca. as long as broad at antenna, 2/3 as broad at vertex as at antenna, black pilose and silver-gold pruinose; vertex triangular, longer than broad, black pilose and brown pruinose; postocular setae black; occipital setae variable: yellow or black; antenna reddish orange.

Thorax. Matte black; postpronotum mixed black and yellow pilose; scutum black pilose; scutellum yellow pilose; postalar callus yellow pilose; proepimeron yellow pilose; posterior anepisternum yellow pilose; katepisternum yellow pilose posteriorly with broadly separated patches; metasternum mixed black and yellow pilose; anepimeron with anterior portion yellow pilose; lower calypter with long black pile. Legs. Coxae black; femora black except extreme apex of femora; remainder of legs reddish; hind trochanter tuberculate as in Fig. 8B; fore and mid-coxae black pilose; hind coxa mixed black and yellow pilose; fore femur black pilose, except small mix of yellow pile basally; mid femur black pilose, but with stretch of yellow pile on posterior side; hind femur black pilose; tibiae and tarsi black pilose; hind tibia as in Fig. 9B.

Wing. Microtrichia absent from following areas: broad anterior margin of cell cua.

Abdomen. Tergites shiny to subshiny black; tergite I with scattered, yellow pile; tergite II with dense yellow pile; tergite III with black pile; tergite IV with black pile; grey pruinosity as follows: tergite I pruinose posteriorly, all of tergite II pruinose; sternites I-III yellow pilose and not pruinose; sternite IV black pilose; pile of postabdomen black. Male genitalia. (Fig. 11E) Cercus yellowish brown, broader at apex, covered with long yellow pile; surstylus brown, ca. 4 × as long as broad, broadened basally with apical ha1/2lf tapering, directed ventrally and with a rounded apex, ventral margin concave, undulated; pile on dorsal surface of surstylus, increasing in length posteriorly; minute spines on ventral surface and apical 3/4 of lateral inner and outer surfaces.

FEMALE. Unknown.

Distribution.

Mexico.

Habitat.

Central American pine-oak forests ecoregion.

Etymology.

Named after Bigot who erected this genus in 1882.