Key to Neotropical species of Cirrula

1. Dorsocentral setae 6 (2+4); cruciate interfrontal setae 2 pairs; arista short, subequal to combined length of antennal segments 1–3; prescutellar setae 1 pair; forebasitarsus of male with ventral tuft of long hairs near apex............ 24. C. hians (Say)

- Dorsocentral setae 5 (1+4); cruciate interfrontal setae 1 pair; arista long, much longer than combined length of antennal segments 1–3; lacking prescutellar setae; hindtarsomeres of male bearing tufts of long hairs........ 23. C. austrina (Coquillett)