Chrysotus plumarista Runyon & Capellari, sp. nov.

(Fig. 1)

Description. Male. Body length, 1.6–1.7 mm. Wing length, 1.4 mm, width, 0.5 mm. Head. Frons dark brown to black, with violet reflections; antenna mostly brown, arista-like stylus (Fig. 1, inset) with distal fifth very slightly broadened, feathered and white at apex; face yellow, essentially obliterated by eyes near middle; proboscis yellowbrown with pale setae; palpus (Fig. 1) white, shiny, bare except small medioapical seta, roundish with inner and apical edge nearly straight, apical edge minutely fringed (ratio tibia I: palpus, 23:12) (MSSC). Thorax. Mesonotum and scutellum metallic green with violet reflections; mesopleuron brown with some bluish reflections and some pruinosity. Wing. Halter yellow, calypter brownish. Legs. I: 22, 23, 12, 5, 4, 2, 2. II: 25, 28, 14, 6, 4, 3, 2. III: 29, 32, 8, 8, 5, 3, 2. Legs yellow except all coxae and base of femur I brown; apical tarsomeres only very slightly darkened. Setae on coxae I, II, and III brown. Hypopygium brown, not dissected; cercus yellow, short, with some brown hairs. Female. Unknown.

Etymology. Name derived from the Latin pluma (feathery) + arista, in reference to the slightly broadened and feathered apex of the arista in males (Fig. 1).

Type material. HOLOTYPE ♂, “ALABAMA: Baldwin Co. | Byrnes (Byrnes Lake) | 30°79’N 87°91’W | 18 July 2000 | J.W. McCreadie”, “HOLOTYPE | ♂ Chrysotus | plumarista | Runyon & Capellari 2018 [red label]” (USNM, type number USNMENT01447155). Paratype: Alabama: Mobile Co., Chunchula, malaise, 30.90°N, 88.20°W (site 20), 19 April 2004, E. Benton (1 ♂, USNM).

Distribution. USA: Alabama, Mobile-Tensaw River Delta.

Remarks. This is the only known species in the C. longipalpus group with a modified arista (Fig. 1, inset). The antennae are missing in the paratype.