New species of plume moths of the genus Agdistis Hübner, 1825 (Lepidoptera: Pterophoridae: Agdistinae) from southern Africa. 6 Author Kovtunovich, Vasily N. Author Ustjuzhanin, Petr Ya. text African Invertebrates 2015 2015-06-30 56 1 137 137 http://www.bioone.org/doi/10.5733/afin.056.0110 journal article 10.5733/afin.056.0110 2305-2562 7661770 Agdistis vansoni sp. n. Figs 3, 4 Etymology:The species is named after Georg (Yuri) Stephanovich van Son (1898–1967), a famous South African lepidopterologist who collected numerous Pterophoridae . Diagnosis: The new species resembles A. krooni in having a similar shape of the valvae and sternite VIII, but differs significantly from that and all other known species in a beak-shaped uncus and in the shape of the costal projections of the valvae. Description: Male . External characteristics ( Fig. 3 ): Wingspan 21–27 mm ( 22 in holotype ). Forewing ashy grey. Two black spots in distal part of forewing parallel to outer margin; another black spot closer to forewing base and posteriad of costal margin. Hindwing uniformly grey. Figs 3, 4. Agdistis vansoni sp. n. , holotype: (3) adult; (4) male genitalia, BMNH 22728. Male genitalia ( Fig. 4 ): Valvae asymmetrical with angular projections along costal margin. Left valva slightly narrowed distally and acute apically. Costal projection on left valva ends with strong brush-like plate with serrate outer margin. Right valva slightly narrowed distally and forms small incisions on cucullar side. Costal projection on right valva has strong serrated plate on upper edge, projection’s tip markedly narrowed. Uncus beak-shaped, strongly developed and bifurcated. Sternite VIII with oval-shaped incision. Lobes of stenite VIII rather long, noticeably narrowed distally.Aedeagus slightly longer than costal projection on right valva, apically slightly bent and tapering. Female . Unknown. Holotype : ♂ SOUTH AFRICA : Northern Cape : 40 km SW of Springbok, Namaqua National Park , 30°01'S 17°25'E , 200 m , 6.x.2009 , Kovtunovich & Ustjuzhanin ( BMNH , gen. pr. 22728). Paratype : SOUTH AFRICA : Northern Cape : 1♂ 40 km SW of Springbok, Namaqua National Park , History Prison , 29°53'S 17°39'E , 13.i.2008 , Kovtunovich & Ustjuzhanin ( CUK , gen. pr. 195) . Western Cape : 1♂ Vredendal, 23–30.vii.1927 , G. van Son ( TMSA , gen. pr. 15263) . Figs 5, 6. Agdistis buffelsi sp. n. , holotype: (5) adult; (6) male genitalia, BMNH 22732. Distribution: South Africa ( Northern Cape , Western Cape ). Remarks: Flight period in January, July and October.