Genus Heteromeringia Czerny

Heteromeringia Czerny, 1903: 72 . Type species, Heteroneura nigrimana Loew, 1864, fixed by monotypy.

Diagnosis. Pedicel with obtuse outer triangular projection and no inner projection; arista minutely pubescent to shortly plumose; prsc absent; lsc one or two; crossvein bm-cu complete, M1 ratio 4.0–8.5, ultimate section of CuA1 slightly shorter than penultimate section; tibiae without pd; surstylus narrow, usually with several spinules on inner tip; cerci separated or united; basiphallus at least partially coiled; hypophallus and paraphallus varying considerably in shape or undeveloped. Males of the nitida -group of Lonsdale and Marshall (2007a) usually have a small, white or yellowish disc on the anepisternum before the posteroventral mesopleural suture (present in the Oriental H. abatanensis sp. nov., H. didyma Sasakawa, 1966, H. helicina Sasakawa, 1966, H. melaena Sasakawa, 1966, H. nitobei Sasakawa, 1966, H. paraphalloides sp. nov., H. pectinata sp. nov. (female too), and H. steyskali Sasakawa, 1966, but absent in H. melanoprotoma sp. nov. .

Remarks. This genus is widely distributed in tropical and warm-temperate areas of the world, with 16 species hitherto known from the Oriental region (Czerny 1926; Frey 1928, 1960; Sasakawa 1966, 1993). A key to the Oriental and Pacific species of this genus was given by Sasakawa (1966).