Teredorus stenofrons Hancock, 1906, Southern America, by original designation.

Size small or medium. Colour varying from ashy to brown and dark brown. body smooth, interspersed with granules.

Head a little or not elevated above the pronotal surface; vertex very strongly narrowed toward the front drawing the eyes together and in front forming a triangular shape, median carinula distinct and not advanced in front of the eyes; face slightly oblique; frontal costa bifurcate just behind lateral ocelli, elevated and compressed between antennae, sinuate in front, moderately sulcate. Antennae filiform, located below the eyes. Eyes more or less globose or pear-shaped, a little or not elevated above the pronotal surface, drawing antero-medially to each other; lateral ocelli situated below middle of eyes.

Pronotum anteriorly truncate, dorsum smoothly granulate, somewhat flattened, but subcylindrical, all the carinae low, median carina depressed or indistinct forward in front shoulders, posteriorly moderately distinct; prozonal carinae obsolete; humeral angles obtuse; pronotal process extend beyond apex of hind femora; lateral lobes of pronotum turned downwards, posterior angles rounded, posterior margin of each lateral lobe with two concavities. Elytra elongate, ovate with acuminate apex. Wings extended beyond the pronotal apex. Fore femora elongate, a little broadened, very finely serrated; middle femora elongate, broadened, bicarinate, margins finely serrated; hind femora elongate, a little crassate, margins finely serrated; first and third segment of hind tarsi equal in length, first pulvilli a little smaller than the second and third, second and third pulvilli equal in length.

The morphology of Teredorus is quite homogeneous, and this genus can be easily distinguished from other genera of the subfamily Tetriginae by vertex very strongly narrowed toward the front drawing the eyes together and in front forming a triangular shape.

Size small, slender. Length of body (from vertex to apex of hind process) 3.8 times as its width (between posterior angles of lateral lobes of pronotum), head distinctly exerted above upper level of pronotum (Fig. 1A). In dorsal view, vertex strongly contracted forward drawing the eyes very near together (Fig. 2A, D), not exserted before eyes, midkeel distinct, extended to occiput; vertex not visible before eyes in lateral view, frontal ridge straight before lateral ocellus, arc-protruding between antennae, longitudinal furrow narrower than width of 1st segment of antennae. Antenna filiform, 15-segmented, inserted between lower margin of eyes (Fig. 2B), mid segments 4-7 times as long as wide. Eyes elevated above the pronotum (Fig. 2B), globular in shape, lateral ocelli placed on slightly lower than middle of anterior margins of eyes (Fig. 2C).

Disc of pronotum smooth, with numerous small granules, mid keel of pronotum entire, upper margin of pronotum slightly undulating before shoulders and straight behind shoulders in profile (Fig. 1A). Anterior margin of pronotum straight, lateral keels of prozona short and parallel (Fig. 2D), humeral angle obtuse, without abbreviated carinae between shoulders. Posterior process of pronotum narrow, long cone-shaped, surpassing apex of hind femur and reaching apex of hind tibia (Fig. 1A, B). Lateral lobes of pronotum turned downwards, posterior angles rounded, posterior margin of each lateral lobe with two concavities. Visible part of tegmina ovate (Fig. 2E), apex narrowly rounded, with length 2.5 times its width. Hind wings developed, reaching and slightly surpassing apex of posterior process of pronotum (Fig. 1A). Upper and lower margins of fore femur and mid femur nearly straight (Fig. 2F, G), width of mid femur narrower than width of tegmina (1: 1.4) (Fig. 2E). Hind femur stubby (Fig. 2H), with length 3.3 times its width, mid keel of dorsal and ventral side of hindfemur dentate, antegenicular right angle and genicular denticles acute angle. Outer side of hind tibia with two to three spines, inner side without spine (Fig. 2I). Length of first segment of posterior tarsus longer than third, first pulvillus and third normal, equal in length, apex abtuse; second pulvillus degenerated and very small (Fig. 2J), apex acute. Ovipositor narrow and long, length of upper valvulae 4.2 times its width, upper and lower valvulae with slender saw-like teeth(Fig. 2K). Length of subgenital fig equal to width, middle of posterior margin of subgenital fig triangularly projecting (Fig. 2L).

Colouration. Disc of pronotum and head blackish-brown with numerous light marks (Fig. 1A, B). Antennae dark brown (Fig. 2A). Hind wings black. Tergites and sternites black. Outer side of hind femora dark, with white marks; inner side black. Hind tibiae black, with brown at base.

(Fig. 1C, D). Similar to female, but smaller and narrower. Subgenital fig short, cone-shaped (Fig. 2N).

Length of body ♂5.5–6.0 mm, ♀ 7.0–7.5 mm; length of pronotum ♂8.0–8.5 mm, ♀ 9.0–9.5 mm; length of hind femur ♂3.5–4.0 mm, ♀ 4.0–4.5 mm.

Holotype female and allotype male, China, Guangxi, Ningming, Aidian, 21°52'N, 107°03'E, 320m alt, 22 July. 2013, collected by Wei-An DENG, IZSNU. Paratypes: Same data, ten male; six females, collected by Wei-An DENG, IZSNU (3♂2♀), SCBHU (7♂4♀).

This species can be easily distinguished from other species of the genus by inner side of hind tibia without spine; second pulvillus of posterior tarsus degenerated, distinctly smaller than first and third. It is only similar to Teredorus ebenotus Zheng & Li, 2001, from which it differs in: antenna inserted between lower margin of eyes; upper margin of pronotum slightly undulating before shoulders and straight behind shoulders in profile; posterior process of pronotum reaching apex of hind tibia; width of mid femur distinctly narrower than tegmina. Teredorus ebenotus Zheng & Li, 2001 exhibits antenna inserted below lower margin of eyes; upper margin of pronotum straight in profile; posterior process of pronotum reaching middle of hind tibia; width of mid femur equal to tegmina.

The new species' name is derived from Latin parv and pulvillus, meaning second pulvillus of posterior tarsus degenerated and very small.

The new species lives in moist stony on the border of streams in tropical rainforests.

China (Guangxi).

Size small, slender. Length of body (from vertex to apex of hind process) 3.2 times as its width (between posterior angles of lateral lobes of pronotum), head not exerted above upper level of pronotum (Fig. 4B). In dorsal view, vertex strongly contracted forward drawing the eyes very near together(Fig. 4D), not exserted before eyes, midkeel distinct, extended to occiput; vertex visible before eyes in lateral view, vertex and frontal ridge forming rounded, frontal ridge slight concave between lateral ocelli, arc-protruding between antennae, longitudinal furrow narrower than width of 1st segment of antennae. Antenna filiform, 15-segmented, inserted below lower margin of eyes (Fig. 4B, C), mid segments 5-6 times as long as wide. Eyes globose, lateral ocelli placed on slightly lower than middle of anterior margins of eyes(Fig. 4C).

Disc of pronotum smooth, with numerous small granules, mid keel of pronotum entire (Fig. 3B), upper margin of pronotum slightly undulating before shoulders and straight behind shoulders in profile (Fig. 3A). Anterior margin of pronotum straight, lateral keels of prozona unconspicuous, parallel (Fig. 4D), humeral angle obtuse, without abbreviated carinae between shoulders. Posterior process of pronotum narrow, long cone-shaped, surpassing apex of hind femur and reaching one third of hind tibia (Fig. 3A). Lateral lobes of pronotum turned downwards, posterior angles rounded, posterior margin of each lateral lobe with two concavities. Visible part of tegmina ovate (Fig. 4E), apex narrowly rounded, with length 2.8 times its width. Hind wings developed, reaching and slightly surpassing apex of posterior process of pronotum (Fig. 4A). Upper and lower margins of fore femur and mid femur straight (Fig. 4F, G), width of mid femur equal to tegmina. Hind femur stubby (Fig. 4H), with length 2.8 times its width, mid keel of dorsal and ventral side of hindfemur dentate, antegenicular right angle and genicular denticles acute angle. Outer side of hind tibia with five to six spines, inner side with four to six spines (Fig. 4I). First segment of posterior tarsus equal to third in length, three pulvilli equal in length, apices of all pulvilli abtuse (Fig. 4J). Ovipositor narrow and long, length of upper valvulae 3 times its width, upper and lower valvulae with slender saw-like teeth (Fig. 4K). Length of subgenital fig equal to width, middle of posterior margin of subgenital fig triangularly projecting (Fig. 4L).

Colouration. Body dark brown. Hind wings black. Fore and mid femora brown, with two black rings in the middle, first segment of tarsi black, apex of second segment black. Hind femora dark brown or brown, inner side black. Hind tibiae black, with two yellowish brown rings in the middle (Fig. 3A).

Male (Fig. 3C, D). Similar to female, but smaller and narrower. Subgenital fig short, cone-shaped (Fig. 4N).

Length of body ♂7.5–8.0 mm, ♀ 9.5–10.0 mm; length of pronotum ♂9.5–10.0 mm, ♀ 11.5–12.0 mm; length of hind femur ♂5.0–5.5 mm, ♀ 6.5–7.0 mm.

Holotype female and allotype male, China, Hunan, Yuanling, Jiemuxi National Nature Reserve, 28°45'N, 110°26'E, 650m alt, 06 Aug. 2013, collected by Yu-Hua DONG, IZSNU. Paratypes: Same data, seven male; eight females, collected by Yu-Hua DONG and Yan-Lan Feng, IZSNU (3♂2♀), SCBHU (4♂6♀).

This species is similar to Teredorus flavistrial Zheng, 2006, from which it differs in: frontal ridge slight concave between lateral ocelli in profile; posterior process of pronotum reaching one third of hind tibia; width of mid femur equal to tegmina; first segment of posterior tarsus equal to third in length, three pulvilli of first segment of posterior tarsus equal in length. Teredorus flavistrial Zheng, 2006, exhibits frontal ridge straight before lateral ocellus in profile; posterior process of pronotum reaching apex of hind tibia; width of mid femur narrower than width of tegmina; length of first segment of posterior tarsus longer than third segment, third pulvillus of first segment of hind tarsi longer than the first and second pulvilli.

The new species was named after the type locality, Hunan, China.

The new species lives in moist stony on the border of streams in rainforests.

China (Hunan).