Ommatius trifidus Vieira, Bravo & Rafael, 2010

Lima, Sheila, Vieira, Rodrigo, Camargo, Alexssandro & Chagas, Cínthia, 2017, Ommatius: synonyms, new record, redescription of Ommatius erythropus and description of the female of Ommatius trifidus (Diptera: Asilidae: Ommatiinae), Zoologia (e 20784) 34, pp. 1-11 : 8-9

Ommatius trifidus Vieira, Bravo & Rafael, 2010

Figs 31–35

Ommatius trifidus Vieira, Bravo & Rafael, 2010: 47 .

Description. Female. Head. Antenna black, scape and pedicel with black setae; palpus black, yellow setose; proboscis black, yellow setose ventrally, labial setae yellow; occiput black, yellow tomentose with whitish setae; 8 black postocular macrosetae.

Thorax. Antepronotum and postpronotum black with white setae; mesonotum black dorsally, brown and yellow tomentose; posthumeral spot, lateroscutal stripes and pleuron silver and yellow tomentose; scutellum yellow tomentose. Chaetotaxy: 2 notopleural macrosetae; 1 supraalar macroseta; 1 postalar macroseta; anatergal setae absent; 4 dorsocentral macrosetae; 2 black marginal scutellar macrosetae; discal scutellar setae yellow; katatergal macrosetae yellow; posterior meron + metanepisternum with row of yellow macrosetae and tuft of small yellow setae on posterior margin, silver tomentose.

Wing. Hyaline; black veins; without costal dilatation; crossvein r-m after middle of cell d; R4+5 bifurcation at level of apex of cell d; microtrichia on posterior wing margin arranged in single row; halter light brown.

Legs ( Fig. 32). Fore and mid femora dark brown dorsally and orange-yellow ventrally, hind femora dark brown, orange-yellow basally; tibia yellow; tarsomeres dark brown. Chaetotaxy: fore femur yellow setose; mid femur yellow setose, with 4 black setae posterodorsally; right hind femur with setae as follows: 6 black setae posteroventrally, 2 black setae posterodorsally; fore tibia largely yellow setose, with 1 long black posteroventral seta; mid tibia with long black and yellow setae; hind tibia with 6 long black setae dorsally.

Abdomen. Black, yellow setulose, white tomentose, posterior margin of tergites light brown; tergites I–II with yellow, lateral, marginal macrosetae; black sternites.

Terminalia. Apical margin of sternite VIII slightly produced ( Fig. 34); tergite IX + X short dorsally ( Fig. 33); apical margin of cercus subtruncate ( Fig. 33); basal half of spermathecae narrower than apical half with ripples at lateral margins ( Fig. 35).

Type examined. Holotype male, Brazil, Pará: Bujaru [01°30’54”S 48°02’41”W], 12.v.1978 / BRASIL, Pará,I.S.Gorayeb [Collector]/ Holótipo Ommatius trifidus Vieira, Bravo and Rafael (MPEG) .

Paratypes: Brasil, Pará: Belém ( MPEG-CAMPUS) [1°27’03”S 48°26’44”W], 1 male, 21.vi.1993 , L. Costa [Collector] ( MPEG); Tucuruí, Rio Tocantins, Marg. [em] Direita Canoal [4°00’48.6”S 49°45’37.8”W], 26–28.iii.1984 /Armadilha Suspensa/ Brasil, Pará, T. Pimentel 1 male ( MPEG); Bôa [Boa], Vista, mu.[nicípio] Castanhal [1°17’53.7”S 47°55’00.5”W], 3.iii.1964 / BRASIL, PA[rá], W. França Col. 1 male ( MZSP); [Rodovia] Belém-Brasília, Km 90 [16°11’22.9”S 49°02’08.3”W], F.S. Antonio, 30.vii.1972 / BRASIL, PA[rá], M. Helana Col. 1 male ( MZSP); Bahia: Seabra [12°25’07”S 41°46’13”W], 11–13.i.2008 . Leg Alvim, E. / Armadilha Luminosa /MZUEFS# 38363 1 male ( MZUEFS); Barreiras , APA Rio de Janeiro [11°53’23.9”S 45°35’46.7”W], 05.iv.2008 , Bravo, F., Menezes, E., Alvim, E., Silva- Neto, A. [Collectors]/MZUEFS #39217 1 male ( MZUEFS) .

Additional material examined. Brazil, Maranhão: Caxias [04°51’32”S 43°21’22”W] (Fazenda Frexeira), 4 females ; Caxias (Res.[erva] Ecol.[ógica] Inhamum) [04°53’30”S 43°24’53”W], (1 female) .

Geographical records. Brazil: Pará, Maranhão (new record) and Bahia.

Remarks. The spermathecae of O. trifidus Vieira, Bravo and Rafael is very similar to O. normus Curran. However , in O. trifidus the basal half of the spermathecae is narrower than the apical half with ripples at the lateral margins, while in O. normus the apical 1/3 of the spermathecae is wider than the basal 2/3, with the two areas separated by a strong constriction ( Scarbrough 2008).