Mesembrinella bequaerti Séguy, 1925

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 : 73-74

Mesembrinella bequaerti Séguy, 1925

Mesembrinella bequaerti Séguy, 1925: 195 . Holotype female (MNHN), not examined. Type locality: Peru

Huascaromusca bequaerti: Hall (1948: 86 , as synonym of Huascaromusca xanthorrhina ); Peris & Mariluis (1984: 254); Kosmann et al. (2013: 77); Wolff et al. (2017: 253) ; Marinho et al. (2017: tab. 1).

Mesembrinella bequaerti: Cerretti et al. (2017 : tab. 2).

Diagnosis. Postpronotal lobe 2x 2; subcostal sclerite bare; outer posthumeral seta absent; wing hyaline; femora brown to black; scutellum lacking discal setae; T1+2 orange; femora all brown or black.

Redescription. [Based on information in Séguy (1925), Guimar„es (1977) and Bonatto (2001); Guimar„es (1977) and Bonatto (2001) examined the holotype female from MNHN.] Head with frontal vitta reddish-brown, darker above; fronto-orbital dark with pale tomentum; parafacial yellow-orange with silvery tomentum; gena yellow; palpus typical; occiput black, covered with yellow-orange tomentum; antenna yellow, arista darkened in distal half. Thorax with dorsum and pleura shiny black with black and yellow setae; mesonotum with four conspicuous pale tomentose stripes; ppn yellow-orange; chaetotaxy: ac 0:1 [Guimar„es (1977) recorded ac 2:1, whereas Bonatto (2001) recorded ac 0:1; we believe 0:1 is most likely the correct formula], dc 2:3, ia 0, ph 0, ppn 2x 2, kat 1:1, scutellum with no sa, pb or disc setae; wing hyaline with faint infuscation along costal border beyond vein R 1; fore leg reddish-brown, mid and hind legs dark brown; all coxae yellow. Abdomen with anterior half of T1+2 yellowish; remainder of T1+2 and T3–5 shiny black; T1+2–3 with lateral marginal setae; T4–T5 with rows of marginal setae; disc of T5 with horizontal row of stout setae.

Material examined. None (no specimens could be obtained for examination).

Distribution. Peru.

Remarks. This species was not found in collections, even though numerous specimens of this family were examined from Peru. Séguy’s description of this species was brief, with little detail. He states (roughly translated from French): “Related to M. decrepita , like decrepita it has a single presutural seta [it is unclear which seta he is talking about], with discal setae on tergite VI [likely what we now call T5]. Stem vein bare; body blue with slight reddish tint on anterior portion of pleura; wings clear, slightly infuscate along costa; legs entirely black. Length 9.5 mm. Peru ”. No specimens were barcoded.