Calosoma (Callistenia) wilkesi LeConte, 1851
Calosoma wilkesi LeConte, 1851: 200 (type: Oregon & Washington; Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts, USA)
Calosoma (Callisthenes) wilkesi Breuning, 1928: 78
Callisthenes (Isostenia) wilkesi Lapouge, 1932: 380
Microcallisthenes (Callistenia) wilkesi Jeannel, 1940: 177
Callisthenes (Microcallisthenes) wilkesi Gidaspow, 1959: 306
Callisthenes (Callistenia) wilkesi Erwin, 2007: 83
Length 15-20 mm. Both, C. wilkesi and C. moniliatum can be easily sorted out by the shape of the elongated body. Both have a transverse pronotum slightly narrower at the base with well-conformed rear angles. In case of C. wilkesi the rear angles of pronotum are more rounded and less protruding from the baseline.
C. wilkesi is well characterized by the sculpture of the elytra: all the intervals are confused and between them only the primary ones can be recognized, because they are indicated by faintly marked foveae. In the type the primary intervals in themselves are not otherwise distinguishable but in other specimens they are slightly elevated in short chain-like segments. The color of the upper body is deep black. Gidaspow (1959: 306) also reports the existence of dark brown or rarely bronze beetles, with dark, coppery or golden, large, elytral foveae.
The type has been found in Oregon and Washington to which Burgess & Collins, (1917: 120) added Idaho and California, without indicating their sources. Gidaspow (1959) and Erwin (2007) later confirmed these data adding the adjoining British Columbia.
Examined specimens and literature’s data
Canada. British Columbia: British Columbia (MZLU), Oliver (UASM)
United States. Oregon or Washington (type, MCZ); Washington, Pullman (MNHN)
Notes: Brachypterous. It inhabits midlands between 700 to 900m altitude, on praries, meadows, radures in woodlands. It is preferably nocturnal, sometime taking refuge under fallen trees in daytime. Adult are active from April to September (Erwin, 2007: 83).
The name of the species honors Charles Wilkes (1798 – 1877) an American naval officer who led the United States Exploring Expedition, 1838-1842, an exploring and surveying expedition of the Pacific Ocean and surrounding lands. The expedition included some naturalists who collected interesting entomological material.
Oregon & Washington (Typus)
(coll. and photo: Museum of Comparative Zoology,
Harvard University, Cambridge, Massachusetts, USA)
Washington, Pullmann, June
(coll. Muséum National d'Histoire Naturelle, Paris)