Open Access

Two fossil tiger beetle species (Coleoptera, Carabidae, Cicindelinae) are described from Eocene Baltic amber using light microscopic and X-ray microscopic techniques. Both species are considered representatives of the subtribe Iresina Rivalier, 1971 due to the shared combination of character states: glabrous head, six labral and four suborbital setae, and glabrous pronotum. Palaeopronyssiformia groehni Wiesner, Will, and Schmidt, new genus, new species, is characterized by a glabrous and furrowed head with six labral setae, large eyes, presence of two supraorbital setae on each side, mandibles with two teeth of the incisor region, and a glabrous and furrowed pronotum. Palaeoiresina cassolai Wiesner, Will, and Schmidt, new genus, new species, is characterized by a unicolored, undentated labrum, mandibles with two teeth of the incisor region, glabrous head with six labral setae, two clypeal setae, two supraorbital setae on each side, and a glabrous pronotum, mesepisternum, mesepimeron, and metepisternum. The species described here represent the only known tiger beetle fossils preserved in Baltic amber.

A key is provided for the twelve taxonomic groups within the genus Therates Latreille (Coleoptera: Cicindelidae). The chennelli group is reviewed here and a key to the 53 species known for this group is provided. Each species is illustrated, and a detailed description of its morphology and distributional records are provided. Therates khaoyaii, Th. pearsoni, Th. safraneki, Th. schuelei and Th. sigridgeissleri are described as new to science. Therates differens Sawada and Wiesner, 1999 is placed into synonymy under Th. concinnus Gestro, 1888. Therates tonkinensis kubani Wiesner, 1988 is placed into synonymy under Th. tonkinensis Horn, 1902 and Th. belokobylskiyi Matalin and Wiesner, 2006 is placed into synonymy under Th. haucki Moravec and Wiesner, 2001. Lectotypes are designated for Th. waagenorum Horn, 1900, Th. clavicornis Horn, 1902, Th. tonkinensis Horn, 1902 and Th. annandalei Horn, 1908. Therates baolocensis Wiesner, 1996 is elevated to species rank.

Prothyma (Genoprothyma) thandamoeae Wiesner, Phyu and Hori, new species, Prothyma (Genoprothyma) sotai Wiesner, Phyu and Hori, new species, and Prothyma (Genoprothyma) asamii Wiesner, Phyu and Hori, new species (Coleoptera: Cicindelidae) are described from Myanmar. A key to all members of the genus known to occur in Myanmar is given.

Thopeutica (Thopeutica) petertaylori Medina, Cabras and Wiesner (Coleoptera: Cicindelidae), new species, is described from the Cagan river, New Bataan, Mindanao. It is characterized by the metallic ground colour of the elytra, prominent middle tooth in the labrum, and bottle-shaped aedeagus with apical hook.

Calochroa horii Wiesner and Phyu, new species, and Calochroa fumikoae Wiesner and Phyu, new species (Coleoptera: Cicindelidae) are described from Myanmar. A key to all members of the genus known to occur in Myanmar is provided.