Nothybus biguttatus Wulp, 1896

Zhou, Jiale, Marshall, Stephen A. & Yang, Ding, 2021, Synopsis of Nothybidae (Diptera: Brachycera) from China, with redescription of Nothybus absens Lonsdale & Marshall, Zootaxa 4926 (2), pp. 201-223 : 210

Nothybus biguttatus Wulp, 1896

( Figs 29–37 )

Nothybus biguttatus Wulp, 1896: 112 ; Aczél, 1955: 10; Frey, 1958: 38; Steyskal, 1977: 30; Galinskaya & Shatalkin, 2015: 583; Lonsdale & Marshall, 2016: 16 . Syntypes (³♀): Indonesia, Java, ZMAN (lost).

Diagnosis. Frons ( Figs 30–32 ) with two velvety black anterior patches. Mesonotum ( Fig. 33 ) with regularly 4 rows of acrostichal setulae in mid-longitudinal stripe. Wing ( Fig. 34 ) distal to level of dm-cu uniformly dark brown except for clear spots in cells r 2+3 and r 4+5 and a more diffuse patch in m 1; crossvein r-m surrounded by dark brown round spot; distal part of CuA 1 subtended by elongate-oval dark brown area extending to dm-cu. Fore basitarsomere ( Fig. 35 ) dark brown with wide middle portion white. Abdominal tergites almost entirely black ( Figs 36, 37 ).

Material examined. CHINA: 1♀, Tibet, Medog, Beibeng (N29.330938°, E95.339495°), 29 May. 2019, leg. Y. He & R . Shen ( CAU).

Distribution. CHINA (Tibet) [new record], INDONESIA (Java, Sumatra), NEPAL, VIETNAM.

Remarks. The specimen examined here is similar to the northern Vietnamese variation mentioned by Galinskaya & Shatalkin (2015) and Lonsdale & Marshall (2016), but the mid femur has a dark medial ring and the hind femur lacks a dark medial band. These specimens are also darker than those from Java and Sumatra but they are identical in other external features.

Figures

FIGURE 29. Nothybus biguttatus Wulp, 1896, habitus, female, lateral. Scale bar: 3.0 mm.

FIGURES 30–37. Nothybus biguttatus Wulp, 1896, female. 30 head, dorsal; 31 same, anterior; 32 same, lateral; 33 thorax, dorsal; 34 wing; 35 fore tarsi; 36 abdomen, dorsal; 37 same, lateral. Scale bars: 1.0 mm.