Ctenostoma agnatum is a species of tiger beetle. This species is found in Ecuador, Peru and western Brazil.Catalogue of Life: Ctenostoma agnatum Its habitat consists of primary forests.
Adults are medium-sized (10.5–11 mm). They are ant-like, with a shiny dark brown to black head and pronotum. The elytra are black with yellow patches and bands.
Adults are brachypterous.A Treatise on the Western Hemisphere Caraboidea (Coleoptera) When in danger, adults roll themselves up and let themselves fall to the ground, where they lie still.The Tiger Beetles of Ecuador: Their Identification, Distribution And Natural History (Coleoptera: Cicindelidae)
Subspecies Ctenostoma agnatum agnatum (Ecuador, Peru, Brazil) - small-jawed comb-mouthed beetle Ctenostoma agnatum fuscum Naviaux, 1998 (Peru) - somber comb-mouthed beetle
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