Calosoma (Chrysostigma) simplex LeConte, 1878

Calosoma simplex LeConte, 1851: 199 (described from California; holotype in Museum of Comparative Zoology, Harvard University, Cambridge, Ma)
Calosoma (Carabosoma) simplex Breuning, 1928: 113
Callitropa (Acamegonia) semilaevis simplex Lapouge, 1931: 389
Chrysostigma simplex Jeannel, 1940: 169
Calosoma (Chrysostigma) simplex Gidaspow, 1959: 271
Callisthenes (Chrysostigma) simplex Erwin, 2007: 81

Length 20-22 mm. C. simplex and C. affine, have the pronotum, narrower behind and the sculpture of elytra is almost smooth, the striae being indicated by superficial punctures only. C. simplex is distinguished by the less transverse pronotum, by its diminutive size, and by the absence of visible foveae on the primary intervals.
simplexis distinguished by its diminutive size, and by the pronotum less transverse, narrow posteriorly. The sculpture of the elytra is only indicated by very weakly dotted striae.
Breuning (1928a: 113) and Gidaspow (1959: 271) quote only captures of C. simplex in various localities of California. Burgess and Collins (1917: 93) also cite it from Arizona, Colorado, Texas, and from Mexico, to which Erwin (2007: 81) adds New Mexico but Bousquet (2012: 243) believes all these quotes incorrect.
On the other hand, C. simplex, imported from the United States in Hawaii, as possible help in controlling the infestations of Lepidoptera Noctuidae, has been consequently cited as part of the entomological fauna of the Islands ( /HBS/checklist).

Examined specimens:
United States. California: Fresno County (SB), Los Angeles (AMNH)

Notes: Winged. It is found from lowlands to uplands up to 2100m altitude. Adults have been found in April-May, August and October-November (Erwin, 2007:81).

Calosoma (Chrysostigma) simplex ♀ LeConte, 1878
United States: California, Huron (Fresno County),
May, 7, 07; from R. Hopping collection