Mayagueza lopesi sp. nov.

(Fig.1: a–b; Fig. 2: a–e; Fig. 3: a–d)

Material Examined. Holotype: ♂ labeled as follows: BRAZIL, GO, Silvânia/ Floresta Nacional de Silvânia / Malaise— Mata de Galeria 1/ 16°37’48.7”S 48° 39’57.7”W / 30.viii.2019 – 27.ix.2019 /Cols. Oliveira, R.S & Lopes, W. R. Specimen in good condition, with terminalia cleared and stored in a microvial pinned below the specimen. Deposited in MZUSP. Paratype: 1 ♀ labeled as follows: BRAZIL, GO, Silvânia/ Floresta Nacional de Silvânia / Malaise— Mata de Galeria 2/ 16°37’47.1”S 48°39’48.3”W / 26.vii.2019 – 30.viii.2019 /Cols. Oliveira, R. S. & Lopes, W. R. Specimen in good condition, with terminalia cleared and stored in a microvial pinned below the specimen. Deposited in MZUSP.

Diagnosis. Surstylus almost fused with epandrium, with ca. 9 peg-prensinsetae; distiphallus narrow, with upward projection; hypandrium Y-shaped, pregonites with 3 setae and ejaculatory apodeme racquet-like.

Male description. Head (see female fig. 2 a–b): slightly wider than the thorax. Eyes large, bare and dark red. Antenna:scape light brown; pedicel light brown with one small seta and several setulae covering its entire surface; first flagellomere light yellow, wider and slightly larger than pedicel; arista micropubescent. Frons brown, slightly darker medially and lighter very close the fronto-orbital bristle; ocellar area black; ocellar triangle brown, with two short, dark brown, cruciate ocellar setae, two postocellar cruciate, slightly shorter than outer vertical bristle, light yellow postocular setae, and ca. 25 minute interfrontal setulae. Three subequal fronto-orbital bristles, with one anterior and one posterior orbital bristles reclinate, and one proclinate orbital bristle at level of middle of frons, slightly shorter than the two reclinate bristles. Facial carina very narrow, confined to the dorsal portion of face; parafacial light brown, slender than gena; gena whitish; vibrissa dark brown, with a row ca. six subvibrissal setae. Proboscis: light yellow; palpus light yellow, with various setulae; labrum light. Thorax (see female figs 1b; 2a): mesonotum entirely brown-yellow. Anterior dorsocentral seta very small, ca. three times shorter than posterior dorsocentral seta. Acrostichal setulae more unevenly arranged; two prescutellar acrostichal setae of equal length; scutellum light yellow; apical scutellar seta cruciate and two times smaller than basal scutellar seta; basal scutellar setae parallel; one postpronotal seta and five postpronotal setulae; two notopleural setae of equal length; postalar setae present and intra-alae setae three times longer than notopleural setae; two katepisternal setae of unequal length present. Legs: all pale yellow; all coxae short, smaller than outers structures of the leg. Foreleg: femur slightly longer than tibia, lateral surface with 6 upright setae. Mid leg: femur and tibia approximately equal in length, with preapical and apical bristles present on midtibia; midfemur with lateral row of ca. seven setae; preapical. Hind leg: femur and tibia approximately equal in length and lateral surface with 7 upright setae. Wing (see female fig. 2e): membrane dark patterned on crossveins dm–m, r–m, and on distal half of cells m 1 and r 2+3; Sc faint, incomplete; CI (ending in M1), with a row of stout black setae; CII (between apices R 1 and R 2+3) and CIII (between apices R 2+3 and R 4+5) with a row of equidistant setulae; R 2+3 and R 4+5 divergent; R 4+5 ending at wing tip. Halter: light yellow. Abdomen (see female fig. 2 c–d): tergites I and II completely yellow; tergite III mostly black, with extreme posterior, anterior, and lateral margins yellow, tergite IV with three black spots (one at center and two laterally) and VI entirely black. Male terminalia (Fig. 3 a–d): epandrium complex with inverted U-shaped, wider than high, almost entirely covered with microtrichia; surstylus almost fused with epandrium, with ca. 9 peg-prensinsetae; cercus with setae in lobes (Fig. 3a). Phallus complex (Fig. 3c): phallus membranous; distiphallus narrow with upward projection, postgonites tips from very close to slightly touching at apex; phallapodeme longer than wide, not fused to the hypandrium; Hypandrium Y-shaped, pregonites with three setae at apex (Fig. 3b); ejaculatory apodeme racquet-like (Fig. 3c).

Female. External morphology similar to male, except as follows: female terminalia (Fig. 3–d)—epiproct and hypoproct with few setae, cercus unequal in width, with microtrichia.

Etymology. The specific name honors Dr. Welinton Ribamar Lopes, a Brazilian entomologist who collected both specimens of the species studied in this article during his exceptional field work collecting Diptera in the Floresta Nacional de Silvânia (state of Goiás).

Distribution. Neotropical: Brazil (Goiás).