1 literature reference for Callidium varium Leconte, 1857:

Author: LECONTE John Lawrence
Year: 1857
Title: Report upon Insects Collected on the Survey. In Reports of Explorations and Surveys to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean
Source: Made under the Direction of the Secretary of War, in 1853-5, according to Acts of Congress of March 3, 1853, May 31, 1854 and August 5, 1854, 12 (2) 3 Zoological Report No. 1, Report upon the insects collected on the survey: 1-72, 2 pls.