Entesia maculicornis (Jaennicke)

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 : 29-32

Entesia maculicornis (Jaennicke)

( Figs 17 ; 18 ; 22D–F ; 49 )

Thereva maculicornis Jaennicke, 1867: 45 — Kertész (1909: 155 [catalogue]); Kröber (1911: 491 [key, lectotype designation]; 1913: 44, 58 [key, checklist]); Stuardo-Ortiz (1946: 86 [catalogue]); Holston (2004: 55 [checklist]).

Entesia maculicornis ( Jaennicke, 1867) — Webb et al. (2013: 14 [catalogue, combination change]).

Psilocephala leptiformis Kröber, 1928a: 33 — Kröber (1928a: fig. 2 [figure]; 1928b: 6, 8 [distribution, key]); Stuardo-Ortiz (1946: 86 [catalogue]); Metz et al. (2003: 254 [translation of original description]). syn. n.

Entesia leptiformis ( Kröber, 1928a) — Metz et al. (2003: 254 [combination change]); Webb et al. (2013: 14 [catalogue]).

Diagnosis. Robust, greyish-brown species with distinctive white and dark brown lateral lines along abdomen; wing mottled; single row of postocular macrosetae in male, macrosetae absent on occiput; male frons very narrow below ocellar tubercle; cervical sclerite with macrosetae absent; posterior surface of midcoxa with setae absent; medial furrow of prosternum with setae present; scutellum with one pair of macrosetae; hind femur with subapical anteroventral seta present; distiphallus short and broad.

Redescription. Body length. 7.0– 8.5 mm (male), 8.0– 9.5 mm (female). Head. Frons flat, pubescence brown dorsally, greyish silver ventrally, patch of short setae above antenna, female with uniform minute dark setae; male frons narrower than anterior ocellus but eyes not contiguous; male postocular setae black, as single row; male occiput relatively concave, pubescence grey, macrosetae absent on occiput; genal setae pale, sometimes admixed with dark setae; antennal scape equal to flagellum length, dark yellow with erect black setae of varying lengths; flagellum brown with grey pubescence. Thorax. Scutum tan-brown with dark brown markings and grey dorsocentral vittae, darker central vitta anteriorly, narrowing posteriorly; scattered dark setae, denser anteriorly; macrosetae black, chaetotaxy: np, 4; sa, 1; pa, 1; dc, 3–5; sc, 1; scutellum light brown, grey laterally, dark brown medially; prosternum with setae in medial furrow; cervical sclerite lacking macrosetae; pleuron with dense silver-grey pubescence, suffused with brown in male, white setae on anepisternum, katepisternum and katatergite; coxae yellow, overlain with silver-grey pubescence, setae mostly pale, macrosetae black, relatively few in number; mid- and hind coxae without setae on posterior surfaces; femora dark yellow, suffused with brown-black dorsally, uniform short dark setae, hind femur with 1–2 subapical anteroventral macrosetae; tibiae and tarsi dark yellow, darker apically, macrosetae elongate; wing dark, mottled infuscate, fenestrate in some cells, venation dark, costal margin setae arranged in 3–4 rows; haltere brown. Abdomen. Sternite 1 lacking medial tuft of setae; abdomen brown dorsally, grey laterally, separated by dark brown vitta dorsolaterally; male without silver velutum on tergites, short dark setae dorsally, longer pale setae laterally, female setae uniform short and dark; abdominal tergite 2 with patch of short modified setae posteromedially; terminalia dark yellow. Male terminalia. Epandrium elongate; macrosetae dark on epandrium and gonocoxites; outer gonocoxite process short, ridge-like; phallus with dorsal apodeme of parameral sheath subtriangular, distiphallus broad, straight and short; ejaculatory apodeme narrow. Female terminalia. As per genus description.

Comments. Entesia maculicornis is known only from a relatively small section of north-central Chile. The dark brown and grey lateral vittae on the abdomen are highly distinctive for this species. Relationships of this species with the rest of the genus are obscure, although it is one of the few species with setae medially on the prosternum. Kröber (1911) indirectly designated the original syntype of Thereva maculicornis as a lectotype (discussed by Webb et al., 2013). Metz et al. (2003) examined the lectotype (listed as the holotype) of Psilocephala leptiformis , included an English translation of the original description and moved it to Entesia . This species has been collected sitting in copula on the vegetated coastal dunes near Los Vilos (MEI, unpublished obervations).

Type material— Thereva maculicornis Jaennicke, 1867 : Lectotype male, CHILE: Valparaiso Region: Valparaiso [-33.0496, -71.6163], Bayerhoffer (MEI119839; SFMD) [examined].

Psilocephala leptiformis Kröber, 1928a : Holotype male, CHILE: Valparaiso Region: Valparaiso [-33.0496, -71.6163], 24.IX.1920, P. Herbst (MEI115971; SDEI) [examined].

Other material examined— CHILE: Atacama Region: 1 male, 70 km S Copiapó [-27.9572, -70.5563], 18.VIII.1966, M.E. Irwin, E.I. Schlinger, dunes (reared) ( MEI153477 ; CSCA) ; 1 male, Illapel, Rio Illapel [-31.6421, -71.1718], 19.X.1966, E.I. Schlinger, M.E. Irwin, 600–900m ( MEI152155 ; CSCA) ; 3 males, 7 km N Los Vilos [- 31.8508, -71.4952], 5.XI.1997, M.E. Irwin, E.I. Schlinger, Malaise in coastal dunes ( MEI106213 , 106793 , 106787 ; CSCA) . Coquimbo Region: 4 males, 5 km N Los Vilos [-31.8695, -71.4973], 28.IX.1997, M.E. Irwin, D.K. Yeates, coastal dunes ( MEI106254–7 ; CSCA) ; 5 males, 2 km N Huentelauquén [-31.5683, -71.5403], 7.X.1966, M.E. Irwin, L.E. Peña, C.O. Berg ( MEI028413–4 , 127069 , 153949 , 153957 ; CSCA) ; 1 male, E El Tofo [-29.4551, -71.2468], 17.X.1971, L.E. Peña ( MEI154201 ; UCCC) ; 1 male, La Herradura [-29.9829, -71.3171], 21–23.X.1971, L. Alvarez ( MEI154200 ; UCCC) ; 4 males, Fray Jorge N.P . [-30.6111, -71.6335], 12.X.1997, 17–25.X.1997, 290 m, M.E. Irwin, H. Vasques, Malaise in wash near Administration ( MEI 106919–22 ; CSCA) ; 13 males, Fray Jorge N.P. , 15 km SW Pachingo [-30.5668, -71.6444], 20.X.1966, E.I. Schlinger, M.E. Irwin ( MEI153907–19 ; CSCA) ; 3 females, Fray Jorge N.P. , entrance gate [-30.6325, -71.6104], 4.X.1997, M.E. Irwin, D.K. Yeates ( MEI106129–31 ; CSCA) ; 1 female, Fray Jorge N.P., El Mineral [-30.6571, -71.6657], Malaise in wet creek bed, M.E. Irwin, E.I. Schlinger, 225 m ( MEI106150 ; CSCA) ; 1 female, Fray Jorge N.P., Quebrada las Vacas , 2 km NW Administration [-30.6710, -71.6421], 3.XI.1997, M.E. Irwin, E.I. Schlinger, Malaise across damp wash ( MEI106151 ; CSCA) . Santiago Metropolitan Region: 2 males, Cuesta la Dormida [-33.0613, -71.0221], 1.XI.1966, E.I. Schlinger, Nothofagus forest ( MEI152166 , 152170 ; CSCA) . Valparaiso Region: 3 males, Papudo [-32.5091, -71.4332], ( MEI152165 , 152167–8 ; UCCC) ; 1 male, 6 km SE Quintero [-32.8367, -71.4998], 20.IX.1966, E.I. Schlinger ( MEI153503 ; CSCA) ; 1 male, 5 miles N Concón [-32.8507, -71.4978], 4.X.1969, Rozen & Peña ( MEI074219 ; AMNH) ; 4 males, 5 km N Algarrobo , 12.X.1966, E.I. Schlinger, coastal dunes ( MEI153463 , 153492 , 153902 , 153904 ; CSCA) ; 1 male, 3 km S El Tabo [-33.4777, -71.6365], 2.X.1966, E.I. Schlinger, coastal dunes ( MEI153501 ; CSCA) .

Figures

FIGURE 17. Entesia maculicornis (Jaennicke): A. Male, oblique view; B. same, lateral view (Scale line: 1.0 mm).

FIGURE 18. Entesia maculicornis (Jaennicke): A. Female, oblique view; B. same, lateral view.

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.