Cicindela purpurea cimarrona

Distinguished from co-occurring green claybank tiger beetles (C. denverensis, C. limbalis, C. splendida, C. decemnotata) by its faint purple tinge and distinct metallic purple border around the elytral margin. Black morph individuals are separable from similar black species such as C. nebraskana and C. longilabris by their distinctly hairy frons. The reduced elytral markings—specifically the short oblique middle line and white rear tip—contrast with the more extensive markings of related species. The parallel-sided body shape and green marginal highlights on head and pronotum help distinguish it from C. formosa where ranges overlap.

Adults measure 12–16 millimeters in body length. Coloration is highly variable and may appear matte green, metallic green, bluish, black, or bronze-purple with green highlights. The elytra bear reduced ivory markings consisting of a short, oblique middle line resembling a tilde symbol and a white spot at the posterior tip. Some individuals may show an additional spot near the elytral edge between these two markings. The body is relatively compact with long, slender legs adapted for rapid running. The frons is distinctly hairy, a feature useful for distinguishing black morph individuals from similar black tiger beetle species.

Occupies degraded prairie habitats with sparse grass cover and abundant bare patches of clay or sandy-clay soil. Found in grassland habitats throughout the central Great Plains and Rocky Mountains, including sandy roadside embankments, eroded road cuts, and open slopes. Not strictly limited to clay substrates; has been observed in fine sand-silt mixtures. Requires open ground for thermoregulation, hunting, and larval burrow construction.

Documented from Canada and the United States in North America. Occurs in the central Great Plains and Rocky Mountain regions, with records from Nebraska, Colorado, Wyoming, and adjacent areas. The subspecific name indicates association with the Cimarron River region. Intergrades with C. p. hatchi occur in far eastern Plumas County, California, near the Nevada border.

Adults active primarily in April, May, and September. As an early-emerging spring-fall species, it is among the first tiger beetles to appear in spring and among the last to disappear in fall. Emergence timing varies with winter severity; mild winters may prompt earlier spring activity. Adults present in fall are sexually immature and enter burrows for winter dormancy before re-emerging.

Adults are active predators of small invertebrates including ants and other insects. Prey is detected visually, pursued by rapid running with intermittent stopping to re-focus, then captured and dismembered with enlarged mandibles. Larvae are ambush predators that seize passing invertebrates from the entrance of their vertical burrows.

Spring-fall life history: adults emerge in fall as sexually immature individuals, overwinter in burrows, and re-emerge in spring to mate and oviposit. Eggs are laid in spring rather than fall, as larvae hatching in autumn would face insufficient prey availability to survive winter. Some individuals may delay emergence until the following spring rather than emerging in fall. Larvae construct vertical burrows in soil, living as ambush predators with heads flush at the tunnel entrance. Summer is spent as larvae and pupae in soil tunnels.

Adults are fast runners that frequently pause during pursuit of prey to re-focus their vision, as their running speed temporarily exceeds their visual processing capacity. When disturbed, adults fly short distances, land, and resume running. They may seek shade under low vegetation during high temperatures and use long legs to elevate bodies above hot substrate surfaces. Males use toothed mandibles to grip matching notches on female pronota during mating, preventing interspecific mating. Black morph individuals are more frequent at northern latitudes and higher elevations, where they may constitute 20–40% of populations in some areas.

Functions as a generalist predator in grassland ecosystems, contributing to regulation of small invertebrate populations. Larval burrows may influence soil structure and aeration in sandy-clay habitats. Serves as prey for larger invertebrates and vertebrates. The spring-fall phenology allows temporal partitioning of resources with summer-active tiger beetle species in shared habitats.

Subject of interest for amateur and professional entomologists, particularly tiger beetle specialists. Photographed for natural history documentation; black morph individuals are especially sought after by photographers. Not considered a pest species. Populations may be vulnerable to habitat loss from agricultural conversion and development of prairie habitats. The species' presence indicates intact or minimally degraded grassland ecosystems.

• Cicindela denverensisAlso green and clay-associated, but lacks the faint purple tinge and metallic purple elytral border; has more extensive elytral markings
• Cicindela limbalisCommon claybank tiger beetle with similar habitat preferences but distinguishable by more complete elytral maculation pattern
• Cicindela splendidaSplendid tiger beetle with more brilliant metallic coloration and different marking pattern
• Cicindela nebraskanaBlack prairie long-lipped tiger beetle that may be confused with black morph C. purpurea; distinguished by less hairy frons and different body proportions
• Cicindela longilabrisBoreal long-lipped tiger beetle occurring at higher elevations; black morph C. purpurea distinguished by hairy frons

Despite the common name 'Purple Tiger Beetle,' individuals frequently appear green, blue, black, or bronze rather than purple. The species is sometimes assumed to be strictly clay-associated, but it occupies a broader range of open habitats including sandy substrates. The spring-fall life history is occasionally misinterpreted as indicating two generations per year, when in fact it represents a single generation with adult dormancy.

• tiger beetle
• grassland
• spring-fall species
• color polymorphism
• prairie
• Great Plains

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Bug Eric: Springtime Tiger Beetles
• Monroe Canyon epilogue – Audubon’s tiger beetle | Beetles In The Bush
• Bug Eric: Cow Path Tiger Beetle
• Monroe Canyon – A Tiger Beetle “Hot Spot” | Beetles In The Bush
• Sweet Sixteen! | Beetles In The Bush