Exorista rustica vs. tubulosa

I always find this species-pair really difficult to split – even when you flip out the male genitalia. The cerci are actually quite distinctive but without good photos you can try to convince yourself that a rustica (the common one) is a tubulosa (the uncommon one). The key is that tubulosa should be really very parallel-sided while rustica is rounded and then the tip is quite pronounced.