Calosoma (Camedula) marginale Casey, 1897

Calosoma lugubre LeConte, 1853: 400 (nec Motschoulsky, 1844) type material: not stated, description compatible with one specimen ♂ (from New Braunfels, Texas); lectotype ♂ in Museum of Comparative Zoology, Harvard University, Cambridge, MA ( (preoccupied by Calosoma lugubre Motschulsky, 1844 = Calosoma denticolle Gebler, 1833)
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 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 (Utah, 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, Sonora, Tamaulipas). Gidaspow reported a catch farther south, in the state of Morelos (1959: 255) and in Costa Rica (1963: 282) without further precision. Erwin (1991: 18), although not having seen specimens from Costa Rica, does not exclude the possibility that C. marginale can be found there, since it can adapt to the margins of cultivated lands that replace the forests cut away.
This species 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 Laredo: Gral Escobedo (; Nuevo Leon: Allende, Apodaca, Monterrey, Santiago (Gidaspow, 1959: 254), Compostela Juárez (; Sonora: Imuris (, Pitiquito, Hermosillo (; Tamaulipas: Nuevo Laredo (Bates, 1991: 224), Ciudad Mante (UASM), El Mante (Gidaspow, 1959: 254).
United States. Arizona: Tucson, Green Valley (; Arkansas: Washington County (SB), Arkansas County (Bousquet, 2012: 233); California (Erwin, 2007: 98); Colorado: (Gidaspow, 1959: 254), Trinidad (; Florida: Miami-Dade county (; Iowa (Bousquet, 2012: 233); Kansas: Sedgwick County (Breuning, 1928a: 99), Elkhart (, Morton County (, Riley County (Jeannel,1940: 96), Atkinson (SB), Kiowa (, Stafford County (; Kentucky: Muhlenberg county (; Missouri: Vernon county (; Nebraska: (SB), Lancaster County (, Ellis county (UASM); Nevada: Vernon county (UASM), Carson City (; New Mexico: Roswell, Cloudcroft, Albuquerque (Breuning, 1928a: 99), Portales, Otero County, Alamogordo (, Chaves Co (; Oklahoma: Ardmore (EM), Cithrie (Breuning, 1928a: 99), Fort Supply, Woodward County, Stillwater, Oklahoma County (, 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 (, Cottle County, Travis County, Denton County, Wise County, Williamson County (, Frio county, Dallas (UASM), Cameron County, Zapata, Kimble County (; Utah: Spanish Valley, San Juan County (

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

updated December 13 2022