Stibasoma apicimacula Fairchild

Turcatel, Mauren, Carvalho, Claudio José Barros De & Rafael, José Albertino, 2010, A taxonomic revision of Stibasoma Schiner, 1867 (Diptera: Tabanidae), Zootaxa 2368, pp. 1-39 : 4-5

Stibasoma apicimacula Fairchild

( Figs. 1–3 )

Stibasoma apicimacula Fairchild, 1940: 686 (description); Fairchild, 1951: 451 –452 (citation); Fairchild, 1953: 267 (arboreal behavior, key); Fairchild, 1953a: 241 (citation); Fairchild, 1971: 75 (catalog); Fairchild, 1986: 76 –77 (key, diagnosis); Fairchild & Burger, 1994: 112 (catalog).

Diagnosis. Thorax and abdomen predominantly dark brown to black; transverse yellow distal band on tergites 1 and 2.

Redescription. Female (Rio Mandinga, 12.ix.1956). Head. Frons divergent above, dark brown with sparse dark brown hairs, some silver hairs lateral to the mid-callus; a fine line of silver pollinosity along eye margin; frontal callus as broad as frons. Subcallus dark brown, shiny, hairless, with longitudinal depression in middle, covered with silver pollinosity; base of the antenna with yellow pollinosity. Scape and pedicel dark brown with black hairs and few white hairs ventrally, with golden pollinosity; flagellum light brown, with golden pollinosity; basal flagellomere with long dorsal spine, reaching the second flagellomere. Palpus dark brown, with black hairs. Face, parafacia, gena and postgena dark brown, with silver grey pollinosity; gena and postgena with reddish-brown hairs.

Thorax. Scutum and scutellum dark brown to black, with sparse dark brown hairs; grey pollinosity, best seen in frontal view. Postpronotal lobe lighter than scutum, with few dark brown hairs and some white hairs anteriorly. Pleuron dark brown, with silver pollinosity and black hairs, except proepisternum and katatergite which have white hairs. Wing with cells bc, c, sc, ma, br, bm, r1 and r2+3 yellowish; apex of cells r1 and r2+3 with brown spot; remaining cells hyaline; venation yellow. Pterostigma yellow. Halter yellow. Femur dark brown with black hairs; tibiae 1 and 2 light brown proximally, dark brown distally, with white hairs proximally on the anterior, anteroventral and anterodorsal sides, black hairs on the remainder; tibia 3 dark brown with black hairs, except for white hairs proximally on anterodorsal side; tarsus dark brown with dark brown hairs, except for reddish hairs on ventral side.

Abdomen. Dark brown to black with black hairs; tergites 1 and 2 with a band of yellow hairs on the distal margin; tergite 1 with apparently incomplete band when viewed dorsally, and longer hairs than tergite 2. Sternites dark brown with slight stripes of gray pollinosity and yellow hairs on the distal margin, except on sternite 1.

Measurements. (n = 1, Rio Mandinga, 12.ix.1956) Body length: 10 mm. Wing length: 9.86 mm. Frontal index: 4.71. Divergence index: 1.28.

Male: unknown.

Type-locality. Panama (Provincia de Coclé).

Distribution. Colombia, Costa Rica, Panama.

Examined material. COLOMBIA. Valle: female, Anchicaya, Cen[tral] Hidroelect, 29.vii.1978, M. A. Tidwell, ( MPEG). PANAMA. Colon: female, Upper Rio Mandinga, 20.viii.1956 ( MPEG); female, Rio Mandinga, 12.ix.1956 ( INPA); San Blas: female, Rio Mandinga, 15.v.1957, P. Galindo ( MPEG); female, idem, 16.v.1957, P. Galindo ( UNH).

Remark. The holotype Ƥ of S. apicimacula currently deposited at the Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts, U.S. A, was not examined in this work.

Figures

FIGURES 1 – 3. Stibasoma apicimacula Ƥ. (1) dorsal view; (2) frontal view; (3) lateral view.