Calosoma (Chrysostigma) cancellatum Eschscholtz, 1833

Length 15-22 mm. C. cancellatum is easily recognizable among the other species of the subgenus Chrysostigma because of its sculpture of elytra of heterodynamic model in which the primary intervals are more raised and consist in series of aligned grains interrupted by foveae with a greenish bottom, the secondary and tertiary ones are confluent and dissolved in rough granules. The pronotum is transverse, not narrowed at the base, with relatively large rear lobes.
C. cancellatum lives in south western Canada and in western US States along the slopes of the Rocky Mountains, to the low and medium altitude lands along the Sierra Nevada in California. The species was described precisely from California where it is still quite common and recently it has be found also in the north of Baja California in Mexico.

Examined specimens and literature’s data
Canada. British Colombia : Vernon (Lindroth, 1961: 53), East Kootenay (www.inaturalist.org).
United States.. Arizona (Burgess & Collins, 1917: 111); California: Alameda County: Berkeley, Fremont 4m. (www.inaturalist.org); Butte County (sub praestans, Casey, 1920: 159); Humboldt county: Six Rivers National Forest (www.inaturalist.org); Los Angeles county: Montebello (www.inaturalist.org); Yolo County: Davis 4m. (MNHN; www.inaturalist.org), El Macero 4m. (www.inaturalist.org/); Orange County: Garden Grove (AMNH), Stanton (SB); Placer County: Tahoe city (www.inaturalist.org); Sacramento county: Cosumnes River Preserve (www.inaturalist.org/), Sacramento (sub aenescens LeConte, 1854: 16); San Bernardino County: Mojave River Fork RP 918m. (www.inaturalist.org); San Diego County: San Diego (sub esuriens and transversa, Casey, 1913: 64); San Francisco County: San Francisco (loc. typ., Eschscholtz, 1833: 23), Compton (Burgess & Collins, 1917: 112); Solano County (http://bugguide.net/); Sonoma County, Marin County, Riverside County (www.inaturalist.org); Ventura County: Moorpark 150m. (www.inaturalist.org); Idaho: Coeur d'Alene (La Rivers, 1946: 136), Nez Perce county (UASM), Camas County (https://bugguide.net/ 1529242), Latah County: Moscow 835 m. (www.inaturalist.org), Canyon County (Deer Flat National Wildlife Refuge) (www.inaturalist.org); Montana: Sanders County (https://bugguide.net); Nevada: Lander co., Mineral co., Washoe co. (La Rivers, 1946: 136); North Dakota: McHenry co. (Bousquet, 2012: 244); Oregon: Clemath County (AMNH), Benton County, Umatilla County (www.inaturalist.org); Utah: Brigham (La Rivers, 1946: 136); Washington: Fort Vancouver (syntype of aenescens, https://mczbase.mcz.harvard.edu/), Whitman county (UASM).
Mexico. Baja California: Laguna Hanson (www.inaturalist.org).

Notes: Winged but wings partially underdeveloped, possibly unable to fly (Lindroth, 1961: 52). Adults are diurnal, active in sunshine but larvae are nocturnal and conceal themselves in leaf litter under plants during the day. It can be found in lowlands and midlands up to 900/1000m altitude, and lives on open ground, frequently on cultivated fields. Adults and larvae lives near the ground and are predators of lepidpterous caterpillars, but the adults also eat other insects as elaterids, flies and orthopterans. According to the data collected, the adults have been observed mostly in Spring (March-May) and in June-July but they remain active up to September.
The description of the larva in all stages and of the pupa has been given by Burgess & Collins (1917: 112).

Calosoma (Chrysostigma) cancellatum Eschscholtz, 1833 ♂ United States: Oregon, Clemath County, Bonanza, 16.V.1962 J D Vertrees (coll. American Museum of Natural History, New York)

Calosoma (Chrysostigma) cancellatum Eschscholtz, 1833 ♀ United States: California, Stanton. VI, 20, 1927