Callisthenes (Chrysostigma) semilaevis (LeConte 1852)
Locality: Native, New World. Mexico- BJ (Guadalupe Island); USA- AZ, CA, ID, OR, UT
Common Name: Semi-smooth Beautiful Black Searcher
Synonyms: Calosoma semilaeve LeConte, 1852; Calosoma semilaeve davidsoni Casey, 1914; Calosoma semilaeve adjutor Casey, 1920
Macrohabitat: Lowlands to midlands, 4-1242 meters altitude. Microhabitat: Cultivated fields (e.g. sugar beet, clover), road sides, ground under low shrubs, and among pea-vines. Markedly favored by human activities. Dispersal abilities: Macropterous, probably capable of flight. Adults and larvae are occasional climbers. Seasonal occurrence: Adults have been found in April- August; copulating pairs in April; gravid females in May- June. Behavior: Diurnal and nocturnal. Adults found overwintering in cavities in the ground (7.5-10 cm deep). Adults are predaceous on caterpillars (e.g. Peridroma saucia Hubner and Malacosoma incurvum Hy Edwards), tenebrionids, elaterids, and carabids. Adults are most active in April- May. (Erwin, 2001; Burgess & Collins, 1917; Larochelle & Lariviere, 2003; Data from NMNH collection).