Phylloclusia bivittata, Sasakawa, Mitsuhiro, 2011

Sasakawa, Mitsuhiro, 2011, Oriental species of clusiid flies (Diptera: Clusiidae: Clusiinae), Zootaxa 3038, pp. 1-28 : 3-4

Phylloclusia bivittata sp. nov.

( Figs 1–3 )

Type material. Holotype male ( BPBM 17240), Laos, Vientiane Prov., Ban Van Eue, 15. V. 1967, native collector. Paratypes: 63, same locality as holotype, 15 & 29. IV. and 15. V. 1966, 30. VIII. and 30. IX. 1967, native collector, light trap; 3, Vietnam, 6 km S of Dalat, 1400–1500 m, 9. VI.–7. VII. 1961, N. R. Spencer; Ƥ, same locality as holotype, 30. IX. 1965, native collector, Ƥ, S. China, Fukien, Shaowu, Taohulau, 1000 m, 18-20 VIII 1945, T. C. Maa.

Diagnosis. This species has two brown stripes on the yellow mesoscutum, a laterally protrudent surstylus, and a long, membranous distiphallus.

Description. MALE. Head yellow; frons shiny, faintly brown-tinged on dorsal half; ocellar triangle black; face with carina pale brown or black at middle (colored part 1/3–1/2 as long as whole length of carina). Antenna yellow to brownish yellow; first flagellomere brown on dorsal 1/3–1/4, with whitish pile; second and third flagellomeres blackish brown; arista brownish yellow; palpus yellow. Thorax brownish yellow; mesoscutum matte, with two brown stripes just laterad of dc-lines throughout entire length of scutum, these distinctly broadened before transverse suture (about 1/2 as wide as distance between dc- and sa-lines, about twice as wide as postsutural stripe), sometimes connecting with each other along anterior margin of scutum or narrowly interrupted on transverse suture, posteriorly extending to lateral margins of scutellum and ending before bases of asc; lsc situated on edge of yellow area of scutellum; postpronotal lobe and pleura yellow; anatergite entirely and mediotergite centrally brown. Wing hyaline, with pale brown marking on apical 1/3–1/4 of R2+3, this marking extending anteriorly to costa, but not reaching to R4+5; calypter pale gray, with margin and fringe brown; halter yellow. Legs yellow; fore tarsus brown. Abdomen shining; T1–3 brownish yellow to pale brown, more or less darkened centrally as fasciae; T4–6 and S8 black; epandrium, surstylus, cercus, and sternites yellowish brown, but epandrium blackened dorsomesally. Bristles brownish yellow.

Frons as wide as eye, diverging ventrally; frontalia bare; parafrontalia not projecting above eye margin in profile, dorsal parafacialia narrowly projecting beyond that; first and second or subequal in length, third or longer than upper two; oh minute, in row; oc slightly shorter than first or; poc as long as oc; facial carina distinctly swollen below antennal bases; gena narrow, 1/10 as high as eye; pm five. Antennae separated at bases by distance equal to diameter of scape; arista arising just behind dorsal tip of first flagellomere, densely pubescent. Palpus broad, almost as wide as base of first flagellomere, setulose ventrally.

Mesoscutum with two postsutural dc, anterior dc about 1/2 as long as posterior dc and situated behind level of sa-base; six rows of acr; prsc subequal to anterior dc in length and situated before level of posterior dc; scutellum with lsc 2/3 as long as asc. Wing 3.4–4.7 (4.0) mm long; three costal sections in proportion of 80–85: 15: 9–10, rm almost at basal 1/3 of cell dm, M1 ratio 1.8–2.2, ultimate section of CuA1 about 1/3 as long as penultimate section. Mid tibia with one long and one or two short spurs.

S8 slightly longer than epandrium. Genitalia: epandrium ( Figs 1, 2 ) with surstylus roundly protruding anterolaterally, slightly projecting ventrally, and sparsely setulose; cercus longer than 1/2 of epandrial height, with long posterior setae; hypandrium ( Fig. 3 ) 440 µm long; phallapodeme 530 µm long; basiphallus short; mesophallus tubular at base but divided into two narrow sclerites distally; distiphallus 590 µm long; paraphallus pointed at base. Body length 3.6–5.0 (4.6) mm.

FEMALE. Similar to male, but brown stripes on mesoscutum never interrupted on transverse suture, notopleuron pale brown, anepisternum brown on anterodorsal 1/3, mediotergite entirely blackish brown except for central pale line, apical marking of R2+3 larger, extending between costa and M1, abdomen brownish black, only T3 brown but anterolaterally yellow (1/3 as long as whole tergal length), T6 with yellowish brown posterior margin, T7 brownish black on basal half but distally yellowish brown; prsc behind level of posterior dc; wing length 4.0 mm; body length 4.9 mm.

Distribution. Laos, Vietnam, S. China.

Remarks. This new species differs clearly from Phylloclusia sternopleuralis sp. nov. and P. hendeli in the coloration of the thorax and shape of the surstylus as stated in the key to the species. It is similar to the Japanese Phylloclusia quadrivittata Sueyoshi, 2006 , which also has a laterally protrudent surstylus, but is easily distinguished by its bivittate mesoscutum, dark abdominal tergites, long mesophallus, and simple paraphallus (see Sueyoshi 2006: fig. 27D–F).

Etymology. The specific name refers to the two brown stripes on the mesoscutum.

Figures

FIGURES 1 – 5. Male genitalia of Phylloclusia bivittata sp. nov. (1 – 3, paratype) and P. sternopleuralis sp. nov. (4, 5, paratype). 1, 2, 4, 5, epandrium (E), surstylus (S), cercus (C), and proctiger (P), lateral view (1,4) and anterior view (2,5); 3, 4, hypandrium (H), phallapodeme (PA), and phallus, lateral view (parts of phallus: BP, basiphallus; DP, distiphallus; EA, ejaculatory apodeme; EP, epiphallus; MP, mesophallus; PP, paraphallus). Scale = 0.1 mm.