Key to Neotropical species of Limnellia Malloch

1. Thorax and abdomen generally shiny black, head yellow or black; wing conspicuously brachypterous (Figs 7, 8, 28, 36). Ocelli and ocellar setae lacking................................................................................ 2

- Generally dark brown to cinereous species; wing normally developed, maculate; ocelli and ocellar setae evident.......... 3

2. Head shiny black; head and thorax with minute setae; tarsi entirely light brown.............. L. vounitis Costa, et al. n.sp.

- Head shiny yellow; setae of head and thorax long, conspicuous; tarsi light brown with apical 2 tarsomeres dark....................................................................................... L. flavifrontis Costa, et al. n.sp.

3. Face entirely grayish; tarsi light yellow, contrasting with black tibiae.............................. L. huachuca Mathis

- Face grayish to brownish, thin gray stripe along oral and lateral margins including antennal fovea, central area brown; tarsi usually dark brown, concolorous with tibiae................................................... L. itatiaia Mathis