Key to Ufo species

1 Frons smooth, shiny; height of eye 1.1 longer than length of malar space (Fig. 30)............................... abei

- Frons alutaceous; height of eye 1.5–2.0´longer than length of malar space (Figs 1, 5, 18)............................ 2

2. Notauli complete, median mesoscutal line present in a form of short triangle posteriorly (Figs 12); 2nd metasomal tergite strongly incised posterodorsally (Figs 16)....................................................... cerroneuroteri

- Notauli incomplete, extending most to half length of mesoscutum, median mesoscutal line absent (Figs 26, 44); 2nd metasomal tergite straight, not incised posterodorsally (Figs 29, 47)...................................................... 3

3. Lower face with dense white setae; height of eye 1.8–2.0´longer than length of malar space (Fig. 18); F1 of female antenna 2.0´longer than pedicel (Fig. 22)................................................................. nipponicus

- Lower face with only scattered setae; height of eye 1.6´longer than length of malar space (Fig. 40); F1 of female antenna 1.4´longer than pedicel (Fig. 42)..................................................................... koreanus