Gauromydas mystaceus (Wiedemann)

(Figs 1 D, 4D–F)

Mydas mystaceus Wiedemann, 1830: 626 . Type-locality: “ Surinam. Wiedemann, 1831: 36, 40, pl. 52, figs 3a, 3b; Westwood, 1841: 51 ( Midas); Walker, 1854: 365; Gerstaecker, 1868: 94; Hunter, 1901: 154 (cat.); Aldrich, 1905: 152 (cat.); Kertész, 1909: 39 (cat.). Holotype ♂, ZMHB.

Gauromydas mystaceus: Wilcox et al., 1989: 106 (n. comb.); Papavero & Artigas, 1990: 122 (cat.); Papavero, 2009: 11, pl. I, figs 3, 3a, 3b (cat.).

Diagnosis. Antenna nearly two times longer than head width; postpedicel orange, proximal portion almost two times longer than distal portion; distal portion of postpedicel 5.8 times longer than wide. Scutum velvety-black with a distinct lateral white pruinose spot around transverse suture. Male hind femur 2 times wider than hind tibia. Hind tibia with well-developed ventral keel, apical spur very well-developed and curved on male, much shorter on female. Hind tarsomere 1 2.7 times longer than wide, and 2.2 times longer than tarsomere 5. Wing membrane mostly dark brown with violate reflection, posterior margin hyaline; alula higher than wide. Tergites and sternites black, sometimes with bluish metallic reflection. T2 golden setulose, remaining tergites dark brown to black setulose. Male epandrial lamellae trapezoidal; phallus with bifid dorsal crest, lateral projections absent. Female S10 widely membranous medially; sclerite at base of spermathecal ducts wider than cercus.

Distribution (Fig. 6, Table 1). Brazil (Pará), French Guiana (Guyane), Guyana (Upper Demerara-Berbice), Surinam.

Non-type material examined. BRAZIL. Pará: Óbidos, ix.1959 (1 ♀, CEIOC); Óbidos, ix.1962, J. Brazilino col. (1 ♂, CEIOC); same data, ix.1972 (1 ♂, CEIOC); same data, viii.1955, Dirings col., AAM-001536 (1 ♂, MZUSP); rede de neblina [mist net] AAM-001575 (1 ♀, MPEG).