Generally orange-yellow in coloration; antenna distinctly longer than body; prescutum orange-yellow with three light brown stripes, sometimes not clear; wings pale brown with a dark brown stigma; abdomen orange with segments six and seven black; hypopygium orange, tergite nine divided by a V-shaped notch, produced into a pair of ear-like processes, sometimes terminated into spinous point, ventral-lateral portions of tergite nine projected into two lobes, densely covered with black setae.

Male. Length: Body: 14.0–18.0 mm (not including antenna, n = 5); Wing: 18.0–20.0 mm (n = 5); Antenna: 18.0–20.0 mm (n = 5).

Head orange. Rostrum orange with distinct orange nasus. Marking of vertex absent (Fig. 1). Eyes black (Fig. 1). Antenna: 12-segmented, distinctly longer than body; scape orange, expanded apically; pedicel orange, short; flagellomeres dark brown, each flagellomere cylindrical and subequal in length, with abundant black verticils, longest one longer than one third of flagellomeres length. Palpi light brown.

Figures 1–11. 

T. (S.) parvauricula1 head, dorsal view 2 thorax, dorsal view 3 thorax, right lateral view 4 wing 5 hypopygium, right lateral view 6 perspective hypopygium, left lateral view 7 ninth tergite, dorsal view 8 inner gonostylus, left lateral view 9 and 10 semen pump, left lateral view 11 compressor apodeme, dorsal view.

Thorax with pronotum entirely orange-yellow (Figs 2–3). Prescutum with three light brown stripes, sometimes not clear (Fig. 2). Scutum orange-yellow with two light brown stripes (Fig. 2). Scutellum and postnotum orange-yellow (Fig. 2). Pleura entirely bright yellow (Fig. 3). Legs slender, coxae, trochanters and femora orange-yellow, tibiae orange-yellow at basal half, changing to brown at apical half, tarsi brownish black. Halteres with stem yellow, knob darker. Wings pale brown, cell sc darker than ground color, stigma dark brown (Fig. 4). Sc relatively short, subequal to R₃ in length, petiole of cell m1 as long as or slightly longer than m-m, approximately one-half length of discal cell (Fig. 4).

Abdomen orange with segments six and seven black. Hypopygium orange, broad, compressed (Figs 5–6). Tergite nine separated by a V-shaped notch in ventral view; gradually narrowed to apex, produced into a pair of ear-like processes, sometimes terminated into spinous point in lateral view; ventral-lateral portions of tergite nine projected into two lobes, densely covered with blackened setae (Figs 5–7). Sternite nine broader than tergite nine, median region of sternite nine protruded to a membranous extension (Fig. 6). Outer gonostylus flattened, widened medially, with a slender rod on ventral-lateral margin, directed dorsally (Fig. 6). Inner gonostylus broad basally, gradually narrowed to apex, rounded with a process truncated apically, ventral margin with a horn-shaped projection, dorsal margin with a finger-like process, basal region of inner gonostylus with a pyramidal process (Fig. 8).

Semen pump with compressor apodeme V-shaped, the arms expanded at apex (Fig. 11). Posterior immovable apodeme with only one arm, distinctly longer than compressor apodeme, gradually narrowed to apex and curved cephalad in lateral view (Fig. 9), sometimes abruptly bent to ventral margin (Fig. 10), the arm deeply grooved in dorsal view. Anterior immovable apodeme flattened, shorter than compressor apodeme, gradually narrowed to apex in lateral view (Figs 9–10). Aedeagus elongated, tubular, at least ten times longer than semen pump (Fig. 6).

CHINA: Guangxi Zhuang Autonomous Region: 2 males, Dalongping, Cenwanglaoshan Mountain, 24°31'N, 106°17'E, 1300 m, 11 May 2015, Guo-Xi Xue leg.; Guizhou Province: 3 males, Leigongshan Mountain, 26°21'N, 108°13'E, 4 Jun. 2015, Guo-Xi Xue leg.

China (Fujian, NW. Guangxi, SE. Guizhou).

In the original description of T. (S.) parvauricula (Alexander 1941), the prescutum is unmarked and the tergite nine is terminated into a pair of spinous points in lateral view. After observing five specimens, we noticed that the prescutum generally has three light brown stripes and the spinous point on tergite nine is not always present.

Three types of semen pumps were defined by Frommer (1963) based on morphological studies of the reproductive system of North American crane flies. Type III is the most common type characterized by the strongly bowed intromittent organ and by posterior immovable apodeme generally with two arms (Frommer 1963). According to the overall morphology, the semen pump of T. (S.) parvauricula should belong to Type III. However, its posterior immovable apodeme has only one arm, which differs from the results in previous works in Chinese species (Ctenophora fumosa Men, 2014 in Men and Huang 2014; Tipula (Vestiplex) coxitalis Alexander, 1935, Tipula (Pterelachisus) biaciculifera Alexander, 1937and Tipula (Emodotipula) yaoluopingensis Men, 2015 in Men 2015; Tipula (Yamatotipula) nova Walker, 1848 in Men et al. 2015a; Nephrotoma liankangensis Men, Xue & Yang and N. pseudoliankangensis Men, Xue & Yang in Men et al. 2015b). This may represent a special form of type III.

Generally straw-yellow; prescutum straw-yellow with three light brown stripes; wings pale brown with a dark brown stigma; abdomen bright yellow on basal three segments, gradually changed to light brown on apical ones, segments six and seven suffused with black; hypopygium straw-yellow, tergite nine rounded at posterior margin and equipped with two finger-like processes, ventral-lateral portions of tergite nine projected into two lobes, densely covered with black setae.

Male. Length: Body: 14.0–15.0 mm (not including antenna, n = 2); Wing: 19.0–20.0 mm (n = 2); Antenna: 18.0–19.0 mm (n = 2).

Head straw-yellow (Figs 12–13). Rostrum light brown with a light brown nasus. Vertex without marking (Fig. 12). Eyes black (Fig. 12). Antenna: 12-segmented, distinctly longer than body; scape light yellow, expanded apically; pedicel light yellow, short; flagellomeres light brown, each flagellomere cylindrical, subequal in length, with abundant black verticils. Palpi light brown.

Figures 12–23. 

T. (S.) biprocessa sp. n. 12 head, dorsal view 13 thorax, right lateral view 14 thorax, dorsal view 15 wing 16 hypopygium, right lateral view 17 hypopygium, left lateral view 18 ninth tergite, dorsal view 19 inner gonostylus and outer gonostylus, left view 20 inner gonostylus and outer gonostylus, right view 21 inner gonostylus and outer gonostylus, dorsal view 22 semen pump, dorsal view 23 semen pump, right lateral view.

Thorax with pronotum entirely orange-yellow (Figs 13–14). Prescutum straw-yellow with three light brown stripes (Fig. 14). Scutum orange-yellow with two light brown stripes (Fig. 14). Scutellum and postnotum orange-yellow (Fig. 14). Pleura entirely bright yellow (Fig. 13). Legs slender, coxae and trochanters straw-yellow, femora straw-yellow with light brown tip, tibiae and tarsi light brown. Halteres with stem yellow, knob darker. Wings pale brown, cell sc darker than ground color, stigma dark brown (Fig. 15). Sc relatively short, subequal to R₃ in length, petiole of cell m1 slightly longer than m-m, approximately one-half length of discal cell (Fig. 15).

Abdomen bright yellow on basal three segments, gradually changed to light brown on apical ones, segments six and seven suffused with black (Fig. 16). Hypopygium straw-yellow (Fig. 16). Hypopygium broad, compressed (Figs 16–17). Tergite nine rounded at posterior margin with two finger-like processes, lateral sides of tergite nine with numerous long hairy setae, longest one longer than finger-like process (Fig. 18). Sternite nine broader than tergite nine, median region of sternite nine protruded to a membranous extension (Fig. 17). Outer gonostylus narrow, flattened, apical two-fifths curved caudad (Figs 19–21). Inner gonostylus flattened, narrowed medially, a slender lobe generated from the median region of inner gonostylus (Figs 19–21).

Semen pump with compressor apodeme V-shaped, the arms expanded at apex, distinctly broader than that of T. (S.) parvauricula (Fig. 22). Posterior immovable apodeme with one arm, distinctly longer than compressor apodeme, gradually narrowed to apex and curved cephalad in lateral view, the arm deeply grooved in dorsal view, basal region distinctly wider than that of T. (S.) parvauricula (Figs 22–23). Anterior immovable apodeme flattened, gradually narrowed to apex in lateral view (Fig. 22). Aedeagus elongated, tubular, at least ten times longer than semen pump.

Holotype male. CHINA: Guangxi Zhuang Autonomous Region, Dalongping, Cenwanglaoshan Mountain, 24°31'N, 106°17'E, 1300 m, 7 May 2015, Guo-Xi Xue leg. Paratype. 1 male, same data as holotype.

We compared the new species with all known species based on published descriptions and illustrations, and found that it is mostly similar to T. (S.) parvauricula by the color of body, the structures of antenna and hypopygium. It can be easily distinguished from the latter by the shape of tergite nine which is rounded at posterior margin with two distinct finger-like processes. The latter species has its tergite nine separated by a V-shaped notch with two short truncated processes and produced into a pair of ear-like processed ventrally. There is also a noticeable difference in the shape of the outer gonostylus which is simple and narrowed in the new species, but flattened and widened medially with a slender rod on ventral-lateral margin in that of T. (S.) parvauricula. Distinct interspecific difference is also found in the shape of inner gonostylus as Figures 8, 19 and 20.

The specific epithet is a noun derived from the Latin ‘processa’ with Latin prefix ‘bi’, referring to the presence of two finger-shaped processes at posterior margin of tergite nine.

China (NW. Guangxi).