Entesia glauca, Winterton & Irwin, 2023

Winterton, Shaun L. & Irwin, Michael E., 2023, Revision of the South American stiletto fly genera Entesia Oldroyd and Melanothereva Malloch, with the description of a new genus (Therevidae: Agapophytinae), Zootaxa 5269 (1), pp. 1-82 : 17-20

Entesia glauca sp. n.

( Figs 3B ; 8 ; 9 ; 12E, F ; 50 )

Zoobank: urn:lsid:zoobank.org:act:802F2094-27CB-42F7-BF94-003860682F93

Diagnosis. Robust, yellowish-brown body with numerous strong, dark setae; sternite 1 with medial patch of erect setae; male with numerous occipital macrosetae; male frons narrower than anterior ocellus; lateral lobe of cervical sclerite with one or more macrosetae; wing smoky infuscate; posterior surface of midcoxa and medial furrow of prosternum lacking setae; two pairs of scutellar macrosetae; hind femur with subapical macroseta present; tergite 2 medial setal patch present; sternite 1 with tuft of erect setae medially.

Description. Body length. 10.0– 11.5 mm (male), 11.0 mm (female). Head. Densely overlain with yellowishbrown pubescence; frons flat, yellow-brown with irregular brown markings, male with small patch of black setae above antenna, shorter and more widely distributed on frons in female, male frons width at narrowest point narrower than anterior ocellus but eyes not contiguous; both sexes with numerous robust, black and occipital macrosetae, postocular macrosetae longer in male; occipital pubescence tan-brown; genal setae dark; antennal scape length subequal to flagellum, brown overlain with grey pubescence, densely covered with large, dark setae; flagellum brown pubescent. Thorax. Scutum greyish tan with brown markings, numerous erect, elongate black setae (shorter in female), narrow medial vitta, lateral vittae tessellate, macrosetae black; scutal chaetotaxy: np, 4; sa, 1; pa, 1; dc, 6–8; sc, 2; scutellum light brown, dark brown anteromedially; prosternum without setae in medial furrow (sometimes a few setae present); pleuron with dense grey pubescence suffused with brown, few black setae on anepisternum and katepisternum, katatergite with admixed pale and dark setae; lateral lobe of cervical sclerite with 1–3 black macrosetae; coxae overlain with silver-grey pubescence admixed with numerous black macrosetae, mid- and hind coxa without setae on posterior surface; femora uniform dark yellow, suffused with dark brown (male), extensive short black setae, admixed with longer setae (male), hind femur with single subapical anteroventral macroseta; tibiae dark yellow; tarsi dark yellow with apices darker; wing uniform smoky infuscate, venation dark, costal margin setae scattered, not in rows, costal cell brown infuscate; haltere brown. Abdomen. Dark brown, overlain with yellowish pubescence (denser in male), segments lighter along posterior margins; sternite 1 with tuft of erect setae medially; male without silver velutum on tergites, male vestiture mostly dark setae, elongate laterally, paler ventrally on anterior sternites; female with uniform short black setae; tergite 2 with patch of short modified setae posteromedially; terminalia dark yellow. Male terminalia. Epandrium sub quadrangular, emarginate anteriorly; numerous elongate black macrosetae on epandrium and gonocoxites; outer gonocoxal process relatively elongate, narrow distally; phallus with dorsal apodeme of parameral sheath subtriangular; ejaculatory apodeme narrow. Female terminalia. As per genus description.

Etymology. The species epithet is an adjective derived from the Latin, glaucus— greyish; referring to the brown to grey pubescence of the pleuron.

Comments. Entesia glauca sp. n. is known from relatively few collections in coastal central Chile, frequently associated with dune vegetation. This yellowish-tan species is distinguished by the numerous dark macrosetae and smoky infuscate wings. This species is one of the few therevids with a medial tuft of erect setae on abdominal sternite 1 (along with E. pallidiventroides sp. n. and E. notabilis ).

Type material— Holotype male, CHILE: Ñuble Region: 5.6 km N Cobquecura [-36.0865, -72.8077], 27.I.1967, L.E. Peña, L. W. Alfaro, leaves of Lithrea (MEI153962; MEUC) . Paratypes. CHILE: Valparaíso Region: 2 males, Quintay [-33.1809, -71.6828], 19.II.1967, E.I. Schlinger, on top of Bacharris in dune area, 10 m (MEI153967, 153968; CSCA) ; 1 male, 2 km N Algarrobo [-33.3406, -71.6501], 15.X.1967, E.I. Schlinger, on dunes (MEI153971; CSCA) ; 1 female, Quintero [-32.7865, -71.5159], Feb. 1959, Etcheverry (MEI152213; UCCC) .

Other material examined — CHILE: Ñuble Region: 1 male, Cobquecura [-36.1332, -72.8019], 13.II.1959, Pina (MEI153978; MEUC) . Valparaíso Region: 1 male, Quintero [-32.7865, -71.5159], 10.II.1967, F. Rojas (MEI112362; UCCC) .

Figures

FIGURE 3. Entesia spp.: A. Entesia blackmani (Oldroyd), male, close-up of coxae; B. Entesia glauca sp. n., male, close up of head and sternum.

FIGURE 8. Entesia glauca sp. n.: A. Male, oblique view; B. same, lateral view.

FIGURE 9. Entesia glauca sp. n.: A. Female, anterolateral view.

FIGURE 12. Entesia spp., male terminalia: E. blackmani (Oldroyd): A. epandrium; B. gonocoxites with phallus in situ, ventral view; E. dolichochele sp. n.: C. epandrium; D. gonocoxites with phallus in situ, ventral view; E. glauca sp. n.: E. epandrium; F. gonocoxites with phallus in situ, ventral view; E. guttata sp. n.: G. epandrium; H. gonocoxites with phallus in situ, ventral view (Scale line: 0.25 mm).

FIGURE 50. Distribution map of Entesia lurida, E. glauca and E. guttata.