Scione kroeberi sp. nov., 2024

Oliveira, Lia Pereira, Henriques, Augusto Loureiro, Buestán, Jaime & Krolow, Tiago Kütter, 2024, Description of four new species of the Neotropical genus Scione Walker, 1850 (Diptera: Tabanidae), European Journal of Taxonomy 947, pp. 1-19 : 10-13

Scione kroeberi sp. nov.

urn:lsid:zoobank.org:act:06279615-8F13-46B8-93A6-404D9EC1E18C

Fig. 6

Diagnosis

Frons brown with yellowish pruinosity and many long black setules with dark brown spot extending to vertex. Subcallus brown. Clypeus brown with many black setulae. Parafacial and gena with white pruinosity and dense, long white setulae. Scape and pedicel brown with black setulae, flagellum orange with last flagellomeres slightly blackened. Thorax with four very evident longitudinal white stripes. Wing smoky with brown veins and dark brown spots in crossveins. Abdomen brown yellowish with black setulae. First three tergites lighter and others darkened. Tergites 1–6 with small posterior median triangle of setulae and pruinosity white.

Etymology

In honor of Otto Kröber, for his invaluable contributions to the knowledge of tabanids.

Type material

Holotype

PERU • ♀ (in good condition, but the right antenna is missing the last flagellomeres); Dept. Amazonas, Olmos-Pomacocha Hwy KM 318–326, rd. above Ingenio; elev. 1.800–2.200 m; 29–31 Jan. 1964; “ P.C. Hutchison and J.K. Wright / Collectors” [white label]; “ HOLOTYPE / Scione kroeberi Oliveira, Henriques, Buestán & Krolow ” [red label]; CAS.

Paratypes

PERU • 1 ♀ (in good condition, but flagella lost); same data as for holotype [white label]; CAS • 1 ♀ (poorly preserved, wings broken on anterior margin); AM, Bongará, Shipasbamba ; 5°51′38.94″ S, 78°41′22.04″ W; elev. 237 m; 24 Sep. 2020; L. Ramírez leg.; UNMSM • 1 ♀ (poorly preserved, right antenna with missing flagellum, left wing with broken posterior margin); AM, Bongará, Shipasbamba ; 5°51′38.94″ S, 78°4′22.04″ W; elev. 237 m; 24 Sep. 2020; L. Ramírez leg.; UNMSM .

Description

Female ( Fig. 6 )

MEASUREMENTS. Body length: 11.5 mm, wing length: 11 mm.

HEAD. Frons slightly divergent below, frontal index 1.7 and divergence index 0.8. Frons with dark brown spot that extends to vertex. Vertex dark brown with long black setulae, slightly prominent ocellar triangle, yellowish brown ocelli. Frons and subcallus brown with yellowish pruinosity, frons with dense black setulae and some copper setulae. Parafacialia brown with yellowish pruinosity and black setulae. Gena with whitish pruinosity and dense and long whitish setulae. Clypeus brown with black setulae, clypeal index 0.6. Scape and pedicel brown with grayish pruinosity and black setulae. Flagellum orange, last flagellomeres slightly blackened. First segment of palpus black and with long and dense yellowish setulae in anterior region and not so long and less dense black setulae in posterior region, second segment orange black and with few short black setulae. Proboscis shiny black, about 3 × as high as frons.

THORAX. Scutum dark brown with black and brownish setulae. Scutellum black with long black setulae. Scutum with four strong longitudinal white stripes, sublateral and lateral stripes connected with strong white stripes at transverse suture. Notopleuron with tuft of black setulae.Anepisternum with tuft of black and whitish dense and long setulae. Katepisternum and anepimeron with tufts of long dense whitish setulae. Post-alar callus with tufts of white setulae. Wing smoky with brown veins and dark brown spots in crossveins. M 2 vein incomplete reaching just over ⅔ of its actual size. r 5 and m 3 cells closed and petiolate, petioles are equivalent in size, slightly less than half length of M 2 vein. Coxae and trochanters dark brown with long dense black setulae. Femora, tibiae and tarsi brown. Femora with dense and long black setulae, tibiae and tarsi with dense and short black setulae.

ABDOMEN. Yellowish brown with dense black setulae. Tergites 1–3 yellowish, other tergites darkened. Tergites 1–6 with small posterior median triangle of setulae and pruinosity white. Sternites yellowish brown with sparse black setulae and inconspicuous posterior band of integument and setulae white on sternites 2–5.

PARATYPE VARIATIONS. Body length 10.9–11.4 mm; wing length: 10.8–11.3 mm; frontal index 1.5–2.1, divergence index 0.7–0.8, clypeal index 0.7. M 2 vein complete in one of paratypes and incomplete in other, reaching ⅓ of its actual size. Two paratypes have second segment of palpus lighter and tufts of setulae on abdomen slightly yellowish. In one of paratypes, spots of intersect of veins are darker.

Distribution

Peru (Amazonas).

Remarks

The species most similar to S. kroeberi sp. nov. are S. bilineata Philip, 1969 , S. limbativena Enderlein, 1925 , S. obscurefemorata, Kröber, 1930 and S. picta, Szilády, 1926 . However, S. bilineata has a brown scape and pedicel with whitish pruinosity and dense and long black setulae, orange flagellum, brown last flagellomere; dark brown palpus, first segment with dense and long black and yellowish setulae, second orange segment on the dorsal margin; brown thorax with dense and long orange setulae; wings with yellowish veins and brown spots in the crossveins that are not so dark and bicolored legs with dark brown femora and yellow tibiae and tarsi. Scione limbativena has a thorax with three inconspicuous whitish longitudinal stripes and wings with dark brown veins. Scione obscurefemorata has yellowish thoracic stripes extending to the posterior margin of the scutum, abdomen without median tufts of white setulae. Scione picta , according to the original description, has reddish antennae and palps, thorax with five dark brown stripes.

Figures

Fig. 6. Scione kroeberi sp. nov. ♀, holotype (CAS). A. Habitus, dorsal view. B. Head, frontal view. C. Head, side view. D. Habitus, lateral view. E. Labels.