Tiger Beetles of United States

Among Africa's most specialized tiger beetles, *Cicindela* (Austrocicindela) haunts the bark and wood of forest trees rather than open ground — a rare arboreal lifestyle in the family. Nocturnal hunters, their larvae develop in burrows within bark. This small subgenus of four species represents a striking ecological departure from typical cicindelid habits.

Key references:
1. Wiesner, J. (2020) — checklist 2. Linnaeus, C. (1758) — original (type genus of family) 3. Pearson, D.L. et al. (2015) — Field Guide USA & Canada

*Cicindelidia* Rivalier, 1954 is a metallic, nocturnal tiger beetle genus of roughly 60 species ranging from the United States and Mexico south through Central America. These small to medium beetles (8–18 mm) favour open wet habitats including riparian clay banks and sandy-clay substrates. Greatest diversity occurs in Mexico.

Key references:
1. Wiesner, J. (2020) — checklist 2. Rivalier, E. (1954) — original genus description 3. Pearson, D.L. et al. (2015) — Field Guide USA & Canada — primary modern treatment

Among the tiger beetles of North America, *Ellipsoptera* stands apart as a specialist of bare sandy shores — riverbanks, lakeshores, and coastal margins where few competitors venture. The roughly 14 species of this Nearctic genus are largely nocturnal hunters, their metallic bodies flashing under moonlight across open, wet substrates. Larvae excavate vertical burrows in fine sand, ambushing prey from the tunnel entrance in the manner characteristic of the family. *Ellipsoptera* ranges across the United States and southern Canada, with outlying occurrences reaching Mexico.

Key references:
1. Wiesner, J. (2020) — checklist authority 2. Dokhtouroff, V.S. (1882) — original genus description 3. Pearson, D.L., Knisley, C.B., Duran, D.P. & Kazilek, C.J. (2015) — Field Guide USA & Canada — current treatment

*Habroscelimorpha* Dokhtouroff, 1883 is a genus of roughly twenty tiger beetle species tied to coastal and saline habitats, where intertidal and supratidal sands serve as both foraging ground and larval nursery. These medium-to-large beetles (12–17 mm) wear a pale metallic livery patterned with contrasting spots — cryptic camouflage against sun-bleached shoreline. Enormously protuberant eyes give them exceptional visual acuity suited to the open, structurally sparse tidal zone. Unusually among tiger beetles, adults are nocturnal hunters, prowling wet sand margins after dark.

Key references:
1. Wiesner, J. (2020) — checklist authority 2. Dokhtouroff, V.S. (1883) — original genus description 3. Pearson, D.L., Knisley, C.B., Duran, D.P. & Kazilek, C.J. (2015) — Field Guide USA & Canada

*Omus* is a small genus of five robust, flightless tiger beetles prowling the forests and open grounds of the Pacific Northwest. Unlike most of their dazzling relatives, these beetles are matte black and strictly nocturnal, hunting by night across compacted soils, sand, and gravel. Their fused elytra make flight impossible, yet *Omus* remains among the most distinctive predators in North American Cicindelidae. Larvae develop in vertical burrows excavated into the soil.

Key references:
1. Wiesner, J. (2020) — checklist authority 2. Pearson, D.L., Knisley, C.B., Duran, D.P. & Kazilek, C.J. (2015) — Field Guide USA & Canada, 2nd ed. 3. Pearson, D.L. & Vogler, A.P. (2001) — Manticorini phylogenetic context