Calosoma (Chrysostigma) semilaeve LeConte, 1852
Calosoma semilaeve LeConte, 1878: 61 (described from San Diego, California; syntype in Museum of Comparative Zoology, Harvard University, Cambridge, Ma)
Calosoma semilaeve davidsoni Casey, 1914: 33 (described from Alameda, California; syntype in National Museum of Natural History, Washington)
Calosoma semilaeve adjutor Casey, 1920: 162 (described from Alameda, California; syntype in National Museum of Natural History, Washington)
Calosoma (Carabosoma) semilaeve Breuning, 1928: 111
Callitropa (Acamegonia) semilaevis Lapouge, 1931: 388
Chrysostigma semilaeve Jeannel, 1940: 168
Calosoma (Chrysostigma) semilaeve Gidaspow, 1959: 271
Callisthenes (Chrysostigma) semilaevis Erwin, 2007: 81
Length 20-27mm. C. semilaeve, as C. affine and C. simplex, has an elytral sculpture with flatten intervals and striae indicated by superficial punctures only. The color in the three species is dull black. C. semilaeve is easily distinguished by the strongly transverse pronotum and by the sculpture of elytra with clearly scaly intervals, especially at humeri.
It lives in the southwestern United States: California, Arizona, Idaho, Oregon, Utah; Breuning (1928a: 111) reports its presence in Guadalupe island, off the coast of Baja California (Mexico).
Following its importation as a potential agents of biological control in Hawaii, C. semilaeve have been also cited as part of the entomological fauna of the Islands (http://www2.bishopmuseum.org /HBS/checklist).
United States. California: Los Angeles (SB), La Puente (EM), Orange County (AVT, EM)
Notes:Winged. It is found from lowlands to midlands up to 1300m altitude, on open ground and tilled fields. It is diurnal as well nocturnal and feeds on caterpillars, cutworms (Elateridae larvae) and other ground-inhabiting larvae (Burgess & Collins 1917: 91). Specimens of C. semilaeve were imported from Ventura County, California, and liberated at Waikii,Hawaii in 1923 in order to control the infestations of Lepidoptera Noctuidae. The adults are active in April-May but they can be found up to December.
A brief description of larval stages can be found in Burgess & Collins (1917: 92).
United States: California, Orange co., Balsa Chico beach, V.1983, Taylor leg. (coll. Vigna Taglianti)
United States: California, Los Angeles, Santa Monica mountains, 16.IV.83 Baierl lgt.