Mesembrinella umbrosa Aldrich, 1922

Whitworth, Terry L. & Yusseff-Vanegas, Sohath, 2019, A revision of the genera and species of the Neotropical family Mesembrinellidae (Diptera: Oestroidea), Zootaxa 4659 (1), pp. 1-146 : 136-137

Mesembrinella umbrosa Aldrich, 1922

( Figs 95–96, 185–186, 235, 278, 322, 366, 407, 451, 484, 488)

Mesembrinella umbrosa Aldrich, 1922: 12 . Holotype male (USNM), examined photographically. Type locality: Tucurrique , Costa Rica.

Mesembrinella umbrosa: Peris & Mariluis (1984: 259) ; Kosmann et al. (2013: 78); Wolff 2013: 121; Wolff & Kosmann (2016: 870); Marinho et al. (2017: tab. 1); Velásquez et al. (2017: 109): Cerretti et al. (2017: tab. 2).

Diagnosis. A large fly averaging 14.2 mm (13–15/5) in length. Thorax reddish with bright bluish-purple abdomen; wing yellowish, anterior margin from costa to vein R 2+3 darker yellow; section IV of wing 0.69 of section III; scutellum without discal setae; subcostal sclerite setose. Epandrium, cerci and surstyli as in Figs 95–96. Female terminalia as in Fig. 322.

Redescription. Male. Head. Frons 0.025 (0.02–0.03/5) of head width at narrowest. Fronto-orbital and parafacial yellow with whitish tomentum; frontal setae ascending about 60% of distance to vertex; frontal vitta dark red, obliterated midway; gena dark orange with pale tomentum and a horizontal row of stout, black setae on ventral margin, otherwise with scattered tan setae; postgena orange with silvery tomentum and fine golden setae; occiput with dark cuticle covered with heavy silvery tomentum and fine golden setae, tomentum absent along upper margin and midway; median occipital sclerite shiny dark orange; antenna orange, first flagellomere with heavy pale tomentum; palpus typical; eye with median facets 4x size of lateral facets; ocellar triangle medium-sized, anterior ocellus 2x size of posterior ocelli; supravibrissal setae short, brown, forming a dense patch ascending 1/4 of distance to antennal base.

Thorax. Dorsum orange with streaky stripes of irregular, whitish tomentum; pleura orange with pale tomentum; chaetotaxy: ac 2:2 or 2:3, dc 2:3, ia 1, ph 1, ppn 3x 3, kat 2:1, meron with very fine setae in an inverted L, 1 slightly convergent ap, sa and lat absent, 1 stout bas, 1 pb, 0 disc; subscutellum prominently developed; spiracles large, orange; legs entirely orange. Wing entirely yellow, anterior edge from costa to R 2+3 darker, middle of cell r 4+5 hyaline; subcostal sclerite setose; basicosta and tegula orange; section IV 0.69 of section III; discs of upper and lower calypters reddish; rim of upper calypter dark with short reddish setae, rim of lower calypter pale with long reddish setae.

Abdomen. T1+2 yellowish with whitish tomentum, T3–5 more or less metallic, gleaming blue; T4 with row of marginal setae, T5 with row of short marginal setae; disc of T5 with dense, short, fine setae only. Terminalia in lateral view with surstylus curved backward, cercus with apical hook ( Fig. 95); in posterior view, cerci broad basally and gradually narrowing to tips ( Fig. 96); phallus in lateral view as in Fig. 185; in dorsal view, hypophallic lobes rectangular with moderate serrations ( Fig. 186); T6, STS7+8, pre- and postgonite, ejaculatory sclerite, ST6 and hypandrium as in Fig. 235; ST1–5 broad, as in Fig. 278.

Female. Similar to male except frons 0.263 (0.24–0.28) of head width at narrowest. T6 of WV shape; T7 continuous, thin, narrowed midway; T8 as separate sclerites ( Fig. 322); ST6–8 and hypoproct as in Fig. 366; spermathecae filiform ( Fig. 407); ST1–5 as in Fig. 451.

Type material examined. HOLOTYPE ³ ( Costa Rica, Cartago; USNM; examined photographically: Fig. 484), labeled: Tucurrique / Costa Rica; CollSchild / & Burgdorf; Mesembrinella / umbrosa / Ald.; Type No. / 25246 / U.S. N.M. [orange label]; USNMENT / 01295435.

Additional material examined. Costa Rica, Alajuela. 1 ♀ *, 1 ♀, San Ramón, Villa Blauca , 1115 m, 18.xi.2008, Tp. Frutas, L _N_242482 483371 #95287, R. Rojas Vasquez ( INBIO) . Cartago. 1 ³, Grano de Oro, 1120 m, Chir- ripo, Turrialba , xi.1992, L_N_ 200250 595900, P. Campos ( INBIO) ; 1 ³, La Suiza de Turrialba , 9.x.1921, P. Schild ( USNM) ; 1 ♀, P.N. Tapanti, 1150 m, vii.1993, L_N_194000 559800 #2801, G. Mora ( INBIO) ; 1 ♀ ♦ ( TLW338 ) , P.N. Barbilla, Turrialba, Tayutic, Campamento 2, 1200 m, 6–9.v.2005, Libre, L_N_213371 600782 #80273, J.D. Gutierrez ( INBIO) . Guanacaste. 1 ³, Macizo Miravalles, Estación Cabro Muco., 1100 m, 27.vi–2.vii.2003, L_N_ 299769 411243 #74526, Tp de Luz , B. Hernández ( INBIO) ; 1 ³, same data except 24.ix–5.x.2003, Libre, #75498 ( INBIO) . Puntarenas. 2 ³³*, 2 ³³, Monteverde , 25–30.viii.1991, 1500 m, D.M. Wood ( CNC) ; 1 ³, same data ex- cept 18–24.viii.1987 ( INBIO) ; 1 ³, same data except San Luis , 1040 m, 24.viii–15.ix.1992, L_N_ 250850 449250, F.A. Quesada ( INBIO) ; 1 ♀, same data except 14–20.v.1990, D.M. Wood ( CNC) ; 1 ♀ ♦ ( TLW370 ) , same data except 20–22.viii.1993 ( INBIO) ; 1 ³*, Est. Pittier , PILA-ACLA, 1670 m, 5–18.1995, L_N_330900 577400 #4437, R. Vil- lalobos ( INBIO) ; 1 ³, same data except 4–22.i.1996, L_S_ 220900 577400 #6813, E. Navarro ( INBIO) ; 1 ³, Send. a Cerro Pittier , 600 m, NO. de la Estación, 1750 m, 18–24.xii.1995, L_S_331250 577150 #7401, on excrement, M. Moraga ( INBIO) ; 1 ³, Estación Agujas. Rio Agujas. Send. Zamia. , 300 m, 14–24.viii.1996, L_S_276750 526550 #8477, A. Azofeifa ( INBIO) ; 1 ♀, Est. La Casona, Res. Biológica, Monteverde , 1520 m, x.1990, L_N_253250 449250, N. Obando ( INBIO) . San José. 1 ♀ *, Zurquí de Moravia , 1600 m, 21.x.2012, #105240, Bait trap with hu- man dung, ZADBI ( LACM) ; 1 ♀ ♦ ( TLW342 ) , same data except 24.ix.2012, #105110 ( LACM) ; 1 ♀ ♦ ( TLW341 ) , same data except 6–12.ix.2012, #105003, Malaise trap #1 ( LACM) ; 1 ♀ ♦ ( TLW340 ) , same data except 22.x– 1.xi.2012, #105314, Malaise trap #1 pan ( LACM) ; 1 ♀, 5400 ft., HWY 2, N of San Isidro , 6.vi.1988, [no collector] ( LACM) . Ecuador, Pastaza. 1 ♀, Napa Sarayacu , 29.x.2015, 1312 m, M. Domínguez ( FSCA) .

Distribution. Costa Rica, Ecuador. Marinho et al. (2017) also listed it from Colombia and Panama.

Remarks. Five specimens ( TLW 338, TLW 340–342 and TLW 370) were barcoded, and grouped together close to M. apollinaris ( Fig. 488).