Phasia bifurca Sun

Sun, Xuekui & Marshall, Stephen A., 2003, Systematics of Phasia Latreille (Diptera: Tachinidae), Zootaxa 276 (1), pp. 1-320: 50-51

publication ID 10.11646/zootaxa.276.1.1

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Phasia bifurca Sun

sp. nov.

3.3.2 Phasia bifurca Sun   , sp. nov.

(Figures I­11, II­6.3)


Holotype ♂, CHINA, Yunnan, Zhongdian, Daixueshan, Yakou, 4,000m, 15.viii.1981, X. Zhang (IZAS); allotype ♀, CHINA, Sichuan, Wolong, 2,200m, 7.ix.1986, Y. Wang (IZAS); paratypes, 3♂, same as allotype (IZAS); 1♀, same as holotype (IZAS).


Body length: 5­7 mm.

MALE: HEAD. Head compressed anteriorly. Eyes separated by a distance larger than or as wide as ocellar triangle. Fronto­orbital plate swollen, black, shining, or grey pruinose (thinly), several rows of hairs laterally (densely, reaching to eyes). Frontal vitta parallel, narrow, black. Frontal vitta at base of antennae 0.25­0.3 times as wide as fronto­orbital plate anteriorly. Ocellar setae present but fine; outer vertical setae present; inner vertical setae present. Face brown to black with grey pruinosity. Parafacial brown to black, without distinct pruinosity; haired; 1.9­2.1 times as wide as first flagellomere. Lower margin of face projecting, visible in profile; orange yellow; shining, without pruinose. Vibrissa not differentiated; intervibrissal distance 1­1.1 times distance between vibrissa and eye on same side; facial ridge with bristles on lower 2/5. Gena black with grey pruinosity; hairs black; height 0.18­0.2 times eye height. Lunule normal; sublunular bulla indistinct. Antenna black, reaching to over half facial height; first flagellomere 1.5­1.6 times as long as pedicel; arista thickened on basal 0.4. Length of oral opening 1.5­1.7 times its width. Occiput flattened, without distinctly pruinose; hairs black. Palpus black.

THORAX. Mesoscutum shining, without pruinosity, with fine black hairs. 0+1 acrostichal seta; 0+1(2) dorsocentral setae; 1­3 postpronotal setae; presutural supra­alar seta present, but fine; 1 postsutural intra­alar seta; 2 notopleural setae; 1 supra­alar seta; 2 postalar setae. Pleuron thinly grey pruinose; hairs black; scale­like hair absent. Anepimeral setae medium size; black; 1 katepisternal seta; 4­8 meral setae. Scutellum black, shining, without pruinosity, with two pairs of marginal setae; apical setae present and distinct; discal setae randomly arranged, not in rows. Subscutellum not very prominent. WING. Lower calypter white with light brown infuscation. Wing base without scale­like setae. Tegula black. Basicosta black. Wing pictured; white with light brown infuscation, narrow; petiole of apical cell 0.15­0.18 times as long as preceding section of R 4+5; M meeting R 4+5 at acute angle. Halter yellow, or brown. LEGS. Fore femur black; hairs black. Fore tibia black, with 1 ad and 2 p, apically with 1 ad, 1 a, 1 v, 1 pv, 1 p, 0­1 pd and 1 d. Fore tarus black. Fore claws black; 0.9­1 times as long as fifth tarsomere. Pulvilli black. Mid femur black; hairs black. Mid tibia black, with 1 ad, 1 v and 2 p, apically with 1 ad, 1 v, 1 pv, 1 p, 1 pd and 1 d. Hind femur black; hairs black; scale­like setae absent. Hind tibia black, with 4­6 ad and 4 pd.

ABDOMEN. Abdominal tergites black; pruinosity present, but thin (shining); longitudinal vitta distinctly present (grey). Relative length of abdominal tergites I+II:III:IV: V = 1.1:1:1:1; relative width I+II:III:IV: V = 0.4:1:1:0.6. Hair spots indistinct. TERMINALIA. Syncercus long, deeply V­notched posteriorly. Surstylus spoon­like, slightly longer than cercus. Ejaculatory apodeme small, knob­like. Hypandrium strong, with two strong thorns ventrally; longer than phallus and phallapodeme. Pregonite reduced, apex with sparse hairs. Postgonite well developed, bent ventrally. Phallus short, with fine hairs dorsally. Ventrolateral process short, well sclerotized; dorsolateral process membranous, but slightly arched.

FEMALE. Wing hyaline. Eyes separated by a distance as wide as ocellar triangle; not touching. Anterior spine­like setae of hind tibia absent. Sternite VII (sheath) longer than sternite VI; tapered; pointed; bent, apex directed dorsally; sternite VII with linear wrinkles ventrally. Ovipositor bent upward.




Latin " bifurca   " refers to the cerci, which are separated by a deep V­notch posteriorly.


Royal British Columbia Museum - Herbarium