Cicindelidia obsoleta

Distinguished from similar species by its large size (among the largest North American tiger beetles), robust build, and characteristic coloration patterns that vary geographically. The nominate western subspecies exhibits jet-black dorsal surfaces with metallic blue genae and violaceous tibiae, while the eastern disjunct population shows green to olive-green to bronzy dorsal coloration. The elytra typically display reduced or interrupted white maculations, ranging from nearly complete bands to small discal spots. Separated from the similar C. punctulata by larger body size, more robust pronotum, and differences in elytral microsculpture. Distinguished from C. nigrocoerulea by less rounded elytral sides and more opaque rather than shiny elytral surface.

Occupies open grassland habitats, particularly dry to xeric uplands with exposed soil or rock substrates. Found on sandy-loam 2-tracks through dry grassland, dolomite and limestone glades, sandstone escarpments, and prairie habitats. In Oklahoma, occurs in rocky grasslands and openings within juniper woodlands. The disjunct Missouri/Arkansas population is restricted to sandstone glades in the White River Hills region. Shows preference for areas with sparse vegetation and exposed ground for thermoregulation and prey capture.

Occurs across the south-central United States from Texas and Oklahoma northward through the Great Plains. The nominate subspecies C. o. obsoleta ranges from Texas and Oklahoma through Kansas and Nebraska. A disjunct population assigned to C. o. vulturina occurs in the White River Hills of southwestern Missouri and north-central Arkansas, separated from the main population by hundreds of kilometers. Records also exist from New Mexico (C. o. santaclarae). Distribution spans Mexico and the United States in North America.

Adults active during fall months (late August through October), with timing varying geographically. The main western population exhibits typical summer activity pattern, while the disjunct Missouri/Arkansas population shows a phenologic shift to fall emergence, mating, and oviposition—unlike true spring-fall species, adults are sexually mature upon emergence and do not overwinter. Activity triggered by late summer and early fall rainfall events that soften soil for burrow construction.

Predatory, feeding on small invertebrate prey captured on open ground. Specific prey items not documented in available sources.

Eggs laid in fall hatch during autumn; larvae require one to two additional seasons to reach third instar, then pupate during summer for fall emergence as adults. The disjunct population completes entire adult reproductive cycle during fall without winter diapause. Larvae construct burrows in soil for ambush predation and development. Third-instar larvae have been documented as hosts for the bee fly parasitoid Anthrax analis.

Diurnal predator active on open ground surfaces. Adults are fast-running and capable of short escape flights when disturbed. Exhibits thermoregulatory behaviors including sun-facing to maximize heat uptake in morning and shade-seeking during midday heat. When alarmed, adults flee to less exposed areas and rely on cryptic coloration to avoid detection. Mating occurs during fall in the disjunct population. Adults sometimes attracted to animal dung, where they may scavenge or hunt associated prey.

Apex invertebrate predator in open grassland and glade habitats. Larval burrows may influence soil structure and aeration. Serves as host for parasitoid bee flies (Anthrax analis).

Subject of interest for entomologists and naturalists due to large size, striking appearance, and geographic variation. Photographed extensively for scientific documentation and nature photography. Not considered economically significant.

• Cicindelidia punctulataSimilar size and habitat preferences, but C. punctulata is smaller with more parallel elytra, shinier surface, and different antennal setation (two setae on basal antennomere versus one in C. obsoleta).
• Cicindelidia nigrocoeruleaSimilar dark coloration and habitat, but C. nigrocoerulea has more rounded elytral sides, shinier elytral surface, and exhibits blue, green, or black coloration rather than brown.
• Cicindela formosaOverlaps in sand dune habitats; distinguished by different elytral maculation patterns and more robust build of C. obsoleta.

• tiger beetle
• Cicindelidae
• grassland
• prairie
• glade
• fall active
• geographic variation
• disjunct population
• predatory beetle
• thermoregulation
• cryptic coloration
• bee fly host

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
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