Romaleosyrphus villosus Bigot, 1882

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 villosus Bigot, 1882


Romaleosyrphus villosus Bigot, 1882

Figs 4E View Figure 4 , 6E View Figure 6 , 8B View Figure 8 , 9E View Figure 9 , 10E View Figure 10 , 11F View Figure 11

Romaleosyrphus villosus Bigot, 1882a: 159. - Bigot (1882b): cxxix. - Bigot (1883): 356. - Williston (1886): 300. Type locality. Mexico. [BMNH]

Crioprora villosa Williston, 1891: 73. - Aldrich (1905): 401. - Coquillett (1910): 528. - Kertész (1910): 291.

Criorhina villosa Thompson, 1976: 119.

Material examined.

El Salvador. Montecristo , 14.36639, -89.38417, 20.iv.1978, D.R. Barger, USNM_ENT1087039 (1♂, USNM) GoogleMaps ; near Metapán, Montecristo , 14.383639, -89.385111, 2300m, 8-10. v.1971, S. Peck, CNC_ Diptera 142469 (1♂, CNC) GoogleMaps ; Honduras. Santa Bárbara : Santa Bárbara 11.5 km S. & 5.6 km W. Penas Blancas , 14.968983, -88.091211, 1870m,, R. Anderson, CNC_ Diptera 101960 (1♀, CNC) GoogleMaps ; Francisco Morazán: San Juancito , 14.220280, -87.0675, 30.iii.1982, R. W. Jones, TAMU-ENTOX0290054 (1♀, TAMU) GoogleMaps ; Olancho: Catacamas , 15.83333, -85.85139, 02.iii.1996, R. Cave, MZLU2014394 (1♀ MZLU) GoogleMaps ; Mexico. Chiapas: Tzomtehuitz, near San Cristobal , 16.833333, -92.633333, 19.v.1969, W.R.M. Mason, CNC_ Diptera 142472 (1♀, CNC) GoogleMaps .

Differential diagnosis.

Scutellum yellow pilose. Tergite II yellow pilose anteriorly and rufous pilose posteriorly. Tergite III rufous pilose anteriorly and black pilose posteriorly. Tergite IV dominantly black pilose. Male hind tibia as in Fig. 9E View Figure 9 . Male genitalia as in Fig. 11F View Figure 11 .


MALE. Body length: 13.8-15.3 mm. Wing length: 9.9-10.5 mm.

Head. Face shape as in Fig. 10E View Figure 10 ; face silver or gold pruinose; gena black pilose posteriorly; anterior tentorial pit black pilose; 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 black; antenna reddish orange.

Thorax. Matte black; postpronotum variable pilose: black or mixed black and yellow; 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 variable pilose: black, yellow, or mixed black and yellow; 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 View Figure 8 ; 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. 9E View Figure 9 .

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 on anterior half and rufous pile on posterior half; tergite III with dense rufous pile on anterior third and black pile on posterior 2/3; tergite IV with black pile; grey pruinosity as follows: tergite I pruinose posteriorly, all of tergite II, tergite III anteriorly; sternites I-III yellow pilose and not pruinose; sternite IV black pilose; pile of postabdomen black.

Male genitalia. (Fig. 11F View Figure 11 ) Cercus yellowish brown, broader at apex, covered with long yellow pile; surstylus brown, ca. 3 × as long as broad, broadened basally with apical third 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. As male, except for usual sexual dimorphism. Microtrichia on wing absent in following areas: broad anterior margin of cell cua, medial area of cell bm, anteriorly in cell dm.

Distribution. El Salvador, Honduras, and Mexico.


Central American pine-oak forests ecoregion.














Romaleosyrphus villosus Bigot, 1882

Moran, Kevin M. & Skevington, Jeffrey H. 2021

Romaleosyrphus villosus

Bigot 1882