Angarotipula biprocessa, Liu, Qifei & Yang, Ding, 2010

Liu, Qifei & Yang, Ding, 2010, Two new species of the genus Angarotipula Savchenko, with a key to world species (Diptera, Tipulidae), Zootaxa 2653, pp. 60-68 : 63-67

Angarotipula biprocessa sp. nov.

( Figs. 4–6 , 15–18 )

Diagnosis. Antennal flagellum strongly nodulose ( Fig. 5 ), black except first flagellomere yellow. Wing yellowish, with costal portion yellow. Tergites of abdomen yellow with a continuous narrow black median stripe; sternites medially with an extremely narrow black stripe. Lobe of gonostylus narrow, and distinctly narrowed at midlength; clasper of gonostylus ventrally smooth, without spine-like process.

Description. Male. Body length 10.5 mm, wing 12.5 mm.

Head ( Fig. 5 ). Rostrum brownish yellow, ventral half brown. Nasus distinct, brownish yellow. Vertex grayish yellow, medially with a black stripe, either side above antenna with a blackish spot; occiput brownish yellow with central portion dark brown; orbits pale yellow. Hairs on head brown. Antenna 3.4 mm long; scape ochreous brown; pedicel obscure yellow; first flagellomere pale obscure yellow, long and cylindrical, a little shorter than scape; second flagellomere black, both sides inconspicuously brownish yellow; other flagellomeres black; flagellomeres 2–10 short, with basal enlargement strongly produced beneath, terminal flagellomere slender. Proboscis dark reddish brown; palpus reddish brown except last segment (excluding basal portion) yellowish brown.

Thorax. General brown with grayish yellow pruinescence. Pronotum yellowish brown, but brown medially; mesonotal prescutum blackish brown with four poorly differentiated brown stripes, medially with a capillary brownish yellow vitta; scutum blackish brown with lateral posterior portion yellow; scutellum dark yellowish brown; mediotergite yellow, medially broadly light reddish brown. Anepisternum and katepisternum blackish, variegated with yellow; anepimeron and katepimeron black; laterotergite yellow; meron black. Coxae light reddish brown; trochanters obscure yellow; femora obscure yellow with tips blackish; tibiae obscure yellow with tips blackish; tarsi blackish brown. Hairs on coxae and trochanters yellow, while those on other segments of legs brown. Wing ( Fig. 6 ) yellowish with cell c dark yellow and cell sc yellow. Stigma light brownish. Rs long, a little longer than R3. Cell m1 twice as long as its petiolate. Cu posteriorly margined with yellow. Veins yellow. Halter with stem yellowish brown, knob brownish.

Abdomen. Ground color yellow. Tergites 1–8 yellow with a relatively narrow black central stripe. Venter yellow medially with an extremely narrow black stripe.

Hypopygium ( Fig. 15 ). Tergite 9 ( Fig. 16 ) with posterior margin bearing a shallow U-shaped median incision and a short obtuse lateral process, posterolateral margin bearing a small spine-like process and a small obtuse process. Lobe of gonostylus ( Fig. 17 ) narrow, but distinctly narrowed at midlength, rounded apically, but on posterior margin before apex with a triangular lobe. Clasper of gonostylus ( Fig. 18 ) elongate, narrowing towards truncated tip, laterally with a black flange at midlength, ventrally smooth without spinelike process; hairs very short.

Female. Unkwown.

Type material. Holotype male, Guizhou: Suiyang, Kuankuoshui Central station (N 28°14΄, E 107°11΄, 1400 m), 2010. VI. 2, Dan Zhou.

Distribution. China (Guizhou).

Remarks. This new species is similar to A. xuthoptera ( Alexander, 1966) , but it can be separated from the latter by cell sc yellow, vein R not blackened, tergite 9 laterally with a obtuse process and a spine-like process, and lobe of gonostylus narrow, but distinctly narrowed at midlength. In A. xuthoptera , vein R is blackened and thickened at the arculus; the posterior border of tergite 9 has no other processes except black spine-like process; the lobe of gonostylus is unusually broad ( Alexander 1966).

Etymology. Name of the new species refers to the black obtuse processes on the posterior border of tergite 9.

Figures

FIGURES 4 – 6. Angarotipula biprocessa sp. nov. 4. Habitus of male, lateral view; 5. head; 6. wing.

FIGURES 15 – 18. Angarotipula biprocessa sp. nov. Male. 15. Hypopygium, lateral view; 16. ninth tergite, dorsal view; 17. lobe of gonostylus, lateral view; 18. clasper of gonostylus, lateral view. Scale bar of 15 – 16 = 0.38 mm, 17 – 18 = 0.2 mm.