Tactusa flexus Fibiger, new species

(Figs. 8, 18)

Type material. Holotype. Male, China, Yunnan prov., Jiangcheng, 15–17.ix.2008, leg. Han, H.L. & Liu, E., genit. prep. 6214 M. Fibiger, coll. NEFU.

Diagnosis. T. flexus is best placed in the T. artus Fibiger 2010 species-group, that comprises 10 species (Fibiger 2010). It differs from the other species in the artus species-group by the broad valva; ampulla inwardly and outwardly almost straight, with upturned tips; the dorsal tip with short, stout spines, directed outwards; coecum very short and broad, triangular; phallus strongly coiled, curved up and down; carina with bifurcately pointed apex. It differs from other Tactusa species by the almost equally broad, prominently dorsally upturned ampulla; the medially extremely constricted juxta-anellus plate; and at ductus ejaculatorius the very broad; and prominently curved phallus.

Description. Adult (Fig. 8). Wingspan: 11.5 mm, forewing narrow. Head, patagia, and base of costa black; ground colour of forewing light beige, with black costal-medial patch, and with black subterminal and terminal area, including fringe; cross-lines absent, except relatively broad white-beige subterminal line and a terminal line marked by black intervenal dots; reniform stigma almost invisible, beige, outlined by a few brown scales. Hindwing unicolourous grey, with discal spot; fringe grey. Ventral surface light brown.

Male genitalia (Fig. 18). Upper part of tegumen thread-like; vinculum and saccus of triple width; saccus short, V-shaped; valvae relatively wide, asymmetrical, right valva shorter; costa inwardly with short, triangular flap; ampulla broad and wide, ventral part largest, dorsal upper part slightly upturned, with a short row of small spinelike setae; digitus small, plate-like, heavily sclerotised; juxta very short, triangular, strongly constricted medially, with semi-circular opening dorsally for position of phallus; phallus tapered from ductus ejaculatorius, strongly curved; carina pointed; vesica unarmed.

Female unknown.

Bionomics. The biotope is a moist, mainly broad-leaf forest with shrubs and herbaceous plants, close to a river. All specimens were collected at light in mid September. The early stages are unknown.

Distribution. (Fig. 30) China (Yunnan prov.).