Key to New World Lyroda

1. Gaster red basally (Fig. 6); tergum I with only a pair of basomedian carinae; forewing membrane in many specimens with dark, subapical, transverse fascia (Fig. 6), inconspicuous in male. South America............................................................. 2

— Gaster all black; tergum I in vast majority of specimens with several smaller ridges in addition to pair of main basomedian carinae; forewing membrane without transverse fascia. North America and Caribbean islands................................................ 3

2. Propodeal dorsum with 10–15 longitudinal ridges in at least two thirds of its length (Fig. 2); mesopleural setae not concealing integument...................... concinna (F. Smith)

– Propodeal dorsum with well-defined median ridge and with smaller, irregular, variously shaped ridges on each side of it (Fig. 8), median carina and smaller ridges lacking in some specimens; mesopleural setae concealing sculpture, at least from certain angles and on selected parts of mesopleuron. [Female: scutellum in most specimens microsculptured (except basally) and with few sparse, minute punctures (Fig. 7), appearing unsculptured under lower magnifications, all punctate in some specimens, with all intermediates].......... fasciata (F. Smith)

3. Propodeal side at most with evanescent ridges, with at least short, rudimentary spiracular groove (Fig. 12). Female: clypeus with three well-defined teeth on each side of lobe (Fig. 10); wing membrane all or largely translucent, except darkened in Floridian populations; clypeal setae silvery; vestiture of clypeus and propodeum silvery; gastral terga I-III with silvery pubescence on apical depressions. Male: clypeal free margin with obtuse median projection (Fig. 11)..................................................................... subita Say

— Propodeal side with well-defined ridges, without spiracular groove (Fig. 19). Female: clypeus with three pairs of inconspicuous (almost invisible) teeth on each side of lobe (Fig. 17); wing membrane dark; clypeal setae dark; vestiture of propodeum and gastral terga black. Male: clypeal free margin rounded mesally (Fig. 18)............................ triloba Say