Timandra quadrata, Cui, Le, Xue, Dayong & Jiang, Nan, 2019

Cui, Le, Xue, Dayong & Jiang, Nan, 2019, A review of Timandra Duponchel, 1829 from China, with description of seven new species (Lepidoptera, Geometridae), ZooKeys 829, pp. 43-74 : 43

Timandra quadrata sp. n. Figs 10, 28, 51

Description.

Head. Antennae bipectinate in basal four-fifths in male, dorsal surface of shaft with reddish-brown scales, pectination yellowish-brown to blackish-brown. Frons dark yellowish-brown with ventral side yellowish-white and slightly protruding. Labial palpi yellowish-brown, not extending beyond frons. Vertex yellowish-white. Thorax. Patagia brown. Tegulae and thorax greyish-brown. Hind tibia with two pairs of spurs in male. Forewing length: male 14 mm. Apex of forewing pointed; outer margin weakly protruding; apex of hindwing rounded; outer margin forming a small protrusion on vein M3. Wing colour yellowish-brown. Forewing with costa covered with brown spots especially on basal half; antemedial line reddish-brown, very narrow and nearly straight; discal spot greyish-black and small, short bar-like; medial line reddish-brown; postmedial line greyish-brown, separated from medial line on vein M1, slightly protruding between M2 and CuA1; two blackish-brown spots present on veins R4 and R5 outside postmedial line; terminal line and fringes reddish-brown. Hindwing with medial line reddish-brown and straight; postmedial line grey, slightly protruding between M3 and CuA1; fringes similar to those of forewing. Underside densely covered with brown speckles; stripes deep brown; discal spot and postmedial line more distinct than those on upperside.

Male genitalia. Uncus short, finger-like. Socii digitiform, short and broad, slightly beyond uncus. Costa broad at basal half, forming a right angle at terminal half, acute at apex; apex of valvula quadrate; a long, slightly curved digitiform arm stretching from cleft between valvula and sacculus; sacculus short, approximately half as long as valvula, narrow at apical one-third, rounded and setose at apex. Juxta long and narrow, tapered in terminal half. Saccus rounded at apex. Aedeagus slightly curved; vesica without cornutus.

Female genitalia. Unknown.

Diagnosis.

T. quadrata is very closely related with T. convectaria , the medial line of the forewing is weakly curved, while it is absolutely straight in T. convectaria ; a sharp protrusion is absent in T. quadrata , while it is present in T. convectaria ; the postmedial line of the hindwing is less protruded in T. quadrata than in T. convectaria . The male genitalia of T. quadrata are also similar to those of T. convectaria , but the socii are slightly stouter than those of T. convectaria ; the costa of the valvula is strongly angled centrally in T. quadrata , but straight in T. convectaria ; the sacculus is much shorter in T. quadrata than in T. convectaria ; the cornutus is absent in T. quadrata , but is present as a long stripe in T. convectaria . For more comparisions, see T. convectaria above.

Type material.

Holotype, ♂, CHINA: Hubei (IZCAS): 1♂, Shennongjia, Honghua, 860 m, 17.VIII.1981, coll. Han Yinheng. Paratype: Henan (IZCAS): 1♂, Baiyun Shan conservation area, 1550 m, 13-15.VIII.2008, coll. Xue Dayong.

Distribution.

China (Henan, Hubei).

Etymology.

The species is named based on the Latin mancus, which refers to the absence of the socii in the male genitalia.