Based on Barraclough's 1992 Dexiini revision, this doesn't conform with the longipes species-group (of which S. tessellatum is a member) because of the darkened cross-veins mid-wing (called 'r-m' in the paper). However, there's not enough visible for me to ID it past genus.
I really think we need to step back the species-level ID's for a few genera, this one included. There's a mind-bogling amount of undescribed species in this genus from the ACT, and the characters you need to separate them are never visible in field photos. Even falling back to the species-groups from Barraclough's 1992 revision might not be conservative enough because you usually can't see the face and pleura well-enough. I'd recommend collapsing all Senostoma and especially Prosena (a taxonomic nightmare of a genus) species entries back to just genus.
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