''Calosoma macrum'' is a species of

ground beetle Ground beetles are a large, cosmopolitan distribution, cosmopolitan family (biology), family of beetles, the Carabidae, with more than 40,000 species worldwide, around 2,000 of which are found in North America and 2,700 in Europe. As of 2015, it i ...

in the subfamily Carabinae. It was described by

John Lawrence LeConte John Lawrence LeConte (May 13, 1825 – November 15, 1883) was an American entomologist of the 19th century, responsible for naming and describing approximately half of the insect taxa known in the United States during his lifetime,

in 1852. The species is long, black, and lives at an elevation of in Guerrero, Mexico. It flies in June and October.

References

protractum Beetles described in 1852 Endemic insects of Mexico Taxa named by John Lawrence LeConte {{Calosoma-stub