Calosoma (Camedula) marginale Casey, 1897

Calosoma lugubre LeConte, 1853: 400 (nec Motschoulsky, 1844) (type locality: Texas); holotype ♂ by monotypy in Museum of Comparative Zoology, Harvard University, Cambridge, MA (
Calosoma marginalis Casey, 1897: 340 (type locality: Arizona); holotype ♂ by monotypy in National Museum of Natural History, Washington (
Calosoma lecontei Csiki, 1927: 21 (unnecessary nomen novum pro lugubre LeConte)
Calosoma (Camegonia) lecontei Breuning, 1928: 97
Callitropa (Camegonia) lugubris Lapouge, 1932: 387
Camedula (Camegonia) lecontei Jeannel, 1940: 207
Calosoma (Camegonia) marginalis Gidaspow, 1959: 281
Calosoma (Carabosoma) marginale Erwin, 2007: 98

Length 26-32 mm. C. marginale, C. parvicolle and C. prominens were included toghether in the ancient Camegonia subgenus (sensu Jeannel, 1940) characterized by the lack of setae on the metatrochanters. All the species have an aspect glossy and a black colour, sometimes with very faint metallic reflections. C. marginale is easily distinguished because the the sides of the pronotum are, at most, very slightly angular; the elytra are with very faint striae and in their basal part we find sparse large punctures connected by deep creases. Gidaspov (1959: 254) has restored the original name of Casey, because she considered that there were no need to use the name lecontei introduced by Csiki in 1927.
C. marginale is found in the south-western United States, East of the Rocky Mountains (Colorado, Nebraska, Arkansas, New Mexico, Kansas, Oklahoma, Texas), and single specimens of it can occasionally reach Canada probably as stray (Lindroth, 1961: 49), Towards South C. marginale is also found in northern Mexico (Chihuahua, Nuevo Leon, Tamaulipas). Gidaspow reported a catch farther south, in the state of Morelos (1959: 255) and in Costa Rica (1963: 282) without further precision. Finally, according to Erwin, (2007: 98) the distribution area of C. marginale in the United States would be much larger, since it seems to be also present in almost all states neighbouring those already mentioned.
C. marginale has been also imported from the United States in Hawaii, as potential agent of biological control. The acclimatization seems having been successfull and C. marginale has been cited as part of the entomological fauna of the Islands.

Material examined:
Canada. Québec: Lake Duparquel (Lindroth, 1961: 49).
Mexico. Chihuahua: Samalayuca (Gidaspow, 1959: 254); Coahuila: Cuatro Cienegas National Reserve (UASM); Morelos: Cuernavaca (Gidaspow, 1959: 254); Nuevo Leon: Allende, Apodaca, Monterrey, Santiago (Gidaspow, 1959: 254); Sonora: Imuris (; Tamaulipas: Nuevo Laredo (Breuning, 1928a: 99), Ciudad Mante (UASM), El Mante (Gidaspow, 1959: 254).
United States. Arkansas: Washington County (SB), Arkansas County (Bousquet, 2012: 233); Colorado (Gidaspow, 1959: 254); Iowa (Bousquet, 2012: 233); Kansas: Sedgwick County (Breuning, 1928a: 99) Morton County (, Riley County (Jeannel,1940: 96), Atkinson (SB) Kiowa (; Missouri: Vernon county (; Nebraska (SB), Lancaster County (, Ellis county (UASM); Nevada: Vernon county (UASM); New Mexico: Roswell, Cloudcroft, Albuquerque (Breuning, 1928a: 99) Chaves Co (; Oklahoma: Ardmore (EM), Cithrie (Breuning, 1928a: 99), Texas County (, Seminole County (; Texas: Brazos County (SB), Brewster County (, Comal County (, Willacy County (EM, SB), Victoria County (EM), San Antonio (EM), Raymondville (EM), Comal County: New Braunfels (Breuning, 1928a: 99), Seymour (; Hidalgo County (; Frio county, Dallas (UASM).

Notes: Winged, attracted to light at night, sometime swarming in very large number. Lives in desert or semidesertic areas as well on pastures and tilled fields, from lowlands up to an altitude of 1800m. In daytime, the adults take refuge in more shady or humid areas, under bushes. According to ancient but extensive laboratory studies (Burgess & Collins, 1917: 79), adults and larvae can destroy large number of caterpillars and feed on and near the ground. Active individuals have been noted from May to November, and in some areas adults can be found overwintering in the soil. (Larochelle & Larivière, 2003: 178).

A very large number of Calosoma marginale attracted to
light at a petrol station, in Texas Seymour may 23 2001
“... there was a plague of black beetles through west Texas. Buildings, roads and lights were covered. Towns smelled of squashed beetle (a nasty sweet scent).”
Calosoma (Camedula) marginale
Casey, 1897
United States, Texas: Willacy county,
Lyford, 4.VIII.65, DG Ford
Calosoma (Camedula) marginale
Casey, 1897
United States, Texas: Willacy county,
Lyford, 4.VIII.65, DG Ford

last review April 22 2019