Calosoma (Ctenosta) bastardi Alluaud, 1925

Length 25-33 mm. This and grandidieri, the other endemic species of Madagascar, were put together by Breuning (1928) in the subgenus Eucalosoma. A peculiarity of their chaetotaxy (presence of one seta on the metatrochanter) distinguishes them from other species of Ctenosta.
bastardi, in turn, can be easily recognized because it has the metatrochanter with a rounded tip and the upper body has a bright blue color, sometimes greenish.
It is found in the south east of Madagascar.

Examined specimens and literature’s data:
Madagascar. pais Mahafaly (type MNHN, TL); Toliara prov: Androy reg (SB), Tsihombe, Beloha (Alluaud, 1925: 163), Toliara (www.inaturalist.org), Sakaraha (EM, SB); forêt d’Andranovory (RMCA), Berenty reserve (TL).

Notes: Winged. Active individuals were found during the hot rainig season, from December to February.
The species has been dedicated to Eugène Joseph Bastard (1865-1910), French naturalist and colonial administrator in Madagascar where he made important entomological collections.

Calosoma (Ctenosta) bastardi ♂ Alluaud, 1925 Madagascar, Pais Mahafaly (holotype) (coll. Muséum National d'Histoire Naturelle, Paris)

Calosoma (Ctenosta) bastardi ♂ Alluaud, 1925 Southern Madagascar, Sakaraha, XII.88

Calosoma (Ctenosta) bastardi ♀ Alluaud, 1925 Southern Madagascar, Sakaraha, XII.88