| Promastax Temporal range:
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|---|---|
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| Promastax archaicus 1910 illustration | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Orthoptera |
| Suborder: | Caelifera |
| Family: | †Promastacidae |
| Genus: | †Promastax Handlirsch, 1910 |
| Species: | †P. archaicus
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| Binomial name | |
| †Promastax archaicus Handlirsch, 1910
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Promastax is a genus of "monkey grasshoppers" belonging to the extinct monotypic family Promastacidae and containing the single species Promastax archaicus. The species is dated to the Early Eocenes Ypresian stage and has only been found at the type locality in east central British Columbia.