Genus Chaetosa Coquillett, 1898

[Japanese name: Chibi-funbae-zoku]

Chaetosa Coquillett, 1898: 163 . Type-species: Cordylura punctipes Meigen, 1826: 239, by original designation.

Diagnosis. Frons anteriorly yellow and posteriorly black; face, parafacial, and gena yellow; postpedicel yellow with acute apical corner, about 2.5 times as long as wide; arista pubescent; vibrissal angle with 1 vibrissa and 1 subvibrissa; palpus yellow without strong subapical seta; 2 fr, 3 or, 1 oc, 1 poc, 1 vte, 1 vti; thorax black; scutum and prescutum grey microtrichose: thoracic pleura greyish dusted; 1-2 pprn, 2 npl, 1+2 ial, 2+3 dc, 1+2 sa, 2 pa; 1 bsc, 1 apsc, 1 prepst, 1 prepm, 3 anepst, 2 kepst; vein A 1 +CuA 2 extending to wing margin; legs yellow; male sternite V bilobate posteriorly; male surstyli long and slender; male cerci with distinct long setae.