Leucophenga jacobsoni Duda, 1926

Leucophenga jacobsoni Duda, 1926 View in CoL

( Figs. 2A View FIGURE 2 , 5A–C View FIGURE 5 , 9A View FIGURE 9 , 13A, 13B View FIGURE 13 , 17 View FIGURE 17 )

Leucophenga jacobsoni Duda, 1926: 50 View in CoL ; Okada, 1976: 2; 1987: 93.

Diagnosis. This species differs from the other species of the genus Leucophenga in having the surstylus caudally curved and narrow ( Fig. 17A View FIGURE 17 ); aedeagus apically acute, laterally with two long, acute processes, each bearing a sensillum at tip ( Fig. 17D View FIGURE 17 ).

Description. Body small. Ocellar triangle dark brown, lacking seta above ocellar setae. Postocellar setae minute ( Fig. 5A View FIGURE 5 ). Frons yellow ( Fig. 5A View FIGURE 5 ). Orb 3 and Orb 2 parallel ( Fig. 5A View FIGURE 5 ). Pedicel yellow ( Fig. 5A View FIGURE 5 ); first flagellomere yellowish ( Fig. 5A View FIGURE 5 ). Clypeus entirely yellow. Palpus yellow ( Fig. 5A View FIGURE 5 ). Mesonotum mostly dark yellow ( Fig. 5B View FIGURE 5 ). Postpronotal lobe yellow ( Fig. 5C View FIGURE 5 ). Acrostichal setulae in ca. 10–12 irregular rows ( Fig. 5B View FIGURE 5 ). Scutellum dark yellow, brownish laterally, yellow at tip ( Fig. 5B View FIGURE 5 ). Pleura, katepisternum, and mesopleuron mostly yellow ( Fig. 5C View FIGURE 5 ). Wing ( Fig. 2A View FIGURE 2 ): entirely hyaline; costal vein between R 2+3 and R 4+5 distally with ca. 7 peg-like spinules on ventral surface; R 4+5 and M 1 nearly parallel distally; halter entirely yellowish ( Fig. 5B View FIGURE 5 ). Abdominal tergites brown, 2nd tergite with yellow patches medially, laterally and posteriorly, 3rd tergite entirely yellowish, setigerous only on posterior margin, 4th tergite yellow anteriorly in males ( Fig. 9A View FIGURE 9 ). Male terminalia: Epandrium pubescent, with ca. 4 setae near posterior margin per side ( Fig. 17A View FIGURE 17 ). Cercus lacking pubescence ( Fig. 17A View FIGURE 17 ). Surstylus pubescent, with only a few setae along distal margin ( Fig. 17A View FIGURE 17 ). Paramere small, rounded basally and apically, lacking sensillum ( Fig. 17C View FIGURE 17 ).

Measurements and indices. BL = 2.40 mm, ThL = 1.17 mm, WL = 2.18 mm, WW = 1.00 mm, arb = 7/4, avd = 0.90, adf = 2.21, flw = 1.71, FW/HW = 0.32, ch/o = 0.02, prorb = 0.067, rcorb = 0.74, vb = 0.44, dcl = 0.50, presctl = 0.55, sctl = 1.20, sterno = 0.64, orbito = 1.64, dcp = 0.20, sctlp = 1.00, C = 2.14, 4c = 1.24, 4v = 1.90, 5x = 1.36, ac = 2.25, M = 0.66, C3F = 0.75.

Specimen examined. CHINA: 1♂ ( SCAU, No. 128504), Jianfengling, Ledong , Hainan, 18˚41'N, 108˚52'E, alt. 220m, 1.xii.2004, ex tussock, HW Chen .

Distribution. China ( Hainan), Thailand (Khao Yai), Malaysia (Malaya), Singapore, Indonesia ( Sumatra, Java).