Thressa beckeri (de Meijere, 1913)

Liu, Xiao-Yan, Yang, Ding & Nartshuk, Emilia P., 2011, Species of the genus Thressa Walker, 1860 from China (Diptera, Chloropidae), ZooKeys 129, pp. 29-48 : 41

Thressa beckeri (de Meijere, 1913)

Hemisphaerisoma politum Becker, 1911: 47. Type locality: Taiwan (Syntypes deposited in Hungarian Natural History Museum, Budapest)

Chalcidomyia beckeri de Meijere, 1913: 292.

Thressa beckeri (de Meijere): Sabrosky 1977: 319; Spencer 1986: 609; Nartshuk 1993: 117.

Diagnosis.

Postpedicel narrow and elongate, 3 times longer than wide.Legs yellow, but entire femora yellow in male; black centrally in female. Wing hyaline with a brown spot near wing apex. Abdomen entirely dark, bluish black.

Distribution.

China: Taiwan; Indonesia; Philippines; Australia.

Remarks.

Becker (1911) firstly described Hemisphaerisoma politum from Taiwan and gave the figure of the head. De Meijere (1913) transferred it to Chalcidomyia , and gave the new name, Chalcidomyia beckeri ( Chalcidomyia politum preoccupied by Chalcidomyia polita de Meijere (1910)). Thressa beckeri (de Meijere) was treated as synonymy with Thressa punctifera (de Meijere) from Java by Duda (1934), but Sabrosky (1977) accepted them as two distinct species.