Nothybus acrobates Frey, 1958

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 : 207

Nothybus acrobates Frey, 1958

( Figs 20–28 )

Nothybus acrobates Frey, 1958: 38 ; Steyskal, 1977: 30; Lonsdale & Marshall, 2016: 14 . Holotype (♀): Laos, ‘Muong Om’, UZMH.

Diagnosis. Frons ( Figs 21–23 ) with two velvety black anterior patches. Ocellar tubercle blackish. Frons with narrow brownish stripe extending from ocellar tubercle to anterior third. Mesonotum ( Fig. 24 ) with regularly 4 rows of acrostichal setulae in mid-longitudinal stripe. Wing ( Fig. 25 ) uniformly dark brown from level of dm-cu to distal margin, except for clear spots in cells r 2+3 and r 4+5 and a diffuse patch in m 1; crossveins r-m and dm-cu surrounded by brown stripe; distal portion of veins R 2+3, R 4+5 and M 1, surrounded with large brown spots; distal part of CuA 1 subtended by elongate-oval dark brown area extending to dm-cu. Fore basitarsomere ( Fig. 26 ) dark brown base and apex and median two thirds white.Abdominal tergites mostly dark yellow with dark brown markings on posteromedial and lateral margins ( Figs 27–28 ).

Material examined. CHINA: 1♀, Yunnan, Lushui, Pianma (N24.124037°, E120.675028°), 25 Jul. 2012 – 10 Aug. 2012, leg. J. Wang ( CAU) .

Distribution. CHINA (Yunnan) [new record], LAOS, MYANMAR.

Remarks. This species is still known only from females and the material studied herein, differs from the redescription of Lonsdale & Marshall (2016) in the following characters: (i) head with narrow brownish stripe from ocellar tubercle to anterior third of frons; (ii) anepisternum dark brown with whitish dorsal stripe; (iii) katepisternum dark brown with whitish yellow spot at posterodorsal margin; (iv) mid coxa with anterior half dark brown and posterior half yellow; (v) hind coxa partially brown and yellow; (vi) mid and hind femora with diffuse brownish distomedial rings ( Fig. 20 ); (vii) abdominal tergite 5 with broad dark brown area laterally, fusing to the posterome- dial brown spot; (viii) tergite 6 brownish yellow with narrow lateral area dark brown. Lonsdale & Marshall (2016) did not mention the color of palpus, however we note that it is dark brown, unlike other species in the genus except N. biguttatus Wulp, 1896 .

Figures

FIGURE 20. Nothybus acrobates Frey, 1958, habitus, female, lateral. Scale bar: 3.0 mm.

FIGURES 21–28. Nothybus acrobates Frey, 1958, female: 21 head, dorsal; 22 same, anterior; 23 same, lateral; 24 thorax, dorsal; 25 wing; 26 fore tarsi; 27 abdomen, dorsal; 28 same, lateral. Scale bars: 1.0 mm.