Entesia hyalina, 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 : 24-26

Entesia hyalina sp. n.

( Figs 14 ; 22A, B ; 49 )

Zoobank: urn:lsid:zoobank.org:act:F0A7CD88-E23F-4803-A523-D282BF86F1EA

Diagnosis. Medium-sized, yellow and grey pubescent species with mostly hyaline wings; male with single row of postocular macrosetae, lacking additional macrosetae on occiput; male frons contiguous below ocellar tubercle; cervical sclerite with macrosetae absent; posterior surface of mid coxa and medial furrow of prosternum with setae absent; scutellum with two pairs of macrosetae; hind femur with subapical anteroventral macroseta present; male abdomen with silver velutum pubescence.

Description. Body length. 7.0 mm (male), 7.5 mm (female). Head. Frons flat, male eyes contiguous, frontal pubescence silver to light brown, male frontal vestiture absent; male occiput relatively concave, postocular macrosetae black, as single row, absent on occiput, occiput pubescence grey; genal setae pale; antennal scape longer than flagellum, dark yellow-orange overlain with grey pubescence, numerous large black setae; flagellum and pedicel brown. Thorax. Scutum grey-brown pubescent admixed with scattered dark setae, denser and longer anteriorly, macrosetae black, chaetotaxy: np, 4; sa, 1; pa, 1; dc, 4; sc, 2; scutellum concolourous with scutum; prosternum without setae in medial furrow; cervical sclerite lacking macrosetae; pleuron with dense silver-grey pubescence; white setae on anepisternum and katepisternum, katatergite setae pale; coxae yellow, overlain with silver-grey pubescence, setae mostly pale, macrosetae few in number or admixed black and white, mid- and hind coxae without setae on posterior surface; femora yellow with short dark setae admixed with longer pale setae, hind femur with single subapical anteroventral macroseta; tibiae and tarsi dark yellow; wing hyaline, infuscate anteriorly and along wing veins, venation brown, costal marginal setae arranged in two rows; haltere brown. Abdomen. Sternite 1 lacking medial tuft of setae; abdomen yellow, tergites dark brown medially, female abdomen dark brown, male abdomen with silver velutum on tergites 2–7; setae elongate and pale, darker on posterior segments and terminalia; abdominal tergite 2 with patch of short, modified setae posteromedially; terminalia dark yellow with dark setae. Male terminalia. Epandrium relatively short, emarginate anteriorly; gonocoxites with short, narrow outer gonocoxal process; distiphallus short, straight, narrow distally; ejaculatory apodeme broad apically; ventral apodeme rounded apically. Female terminalia. As per genus description.

Etymology. The species epithet is an adjective derived from Latin, hyalinus —of glass; referring to largely hyaline wings.

Comments. Entesia hyalina sp. n. is known from central Chile. It is one of the few species of Entesia where the males have silver velutum pubescence on the abdomen. This species is associated with coastal dune vegetation.

Type material— Holotype male, CHILE: Araucania Region: 12.7 km N Loncoche [-39.2661, -72.6941], 390 m, 21.I.1967, M.E. Irwin (MEI152198; UCCS) . Paratype. CHILE: Los Lagos Region: 1 male, Pucatrihue , coastal dunes [-40.466, -73.716], 20.I.1967, L.A. Stange (MEI152199; CSCA) ; 1 female, 5 km E Rio Negro [-40.8001, -73.16601], 13.II.1966, M.E. Irwin (MEI154100; CSCA) .

Figures

FIGURE 14. Entesia hyalina sp. n.: A. Male, oblique view; B. same, lateral view (Scale line: 1.0 mm).

FIGURE 22. Entesia spp., male terminalia: E. hyalina sp. n.: A. epandrium; B. gonocoxites with phallus in situ, ventral view; E. lurida sp. n.: C. gonocoxites with phallus in situ, ventral view; E. maculicornis (Jaennicke): D. gonocoxites with phallus in situ, dorsal view; E. epandrium; F. gonocoxites with phallus in situ, ventral view; E. notabilis (Macquart): G. epandrium; H. gonocoxites with phallus in situ, ventral view (Scale line: 0.25 mm).

FIGURE 49. Distribution map of Entesia dolichochele, E. hyaline, E. maculicornis, E. blackmani and E. delicata.