The mild, snowless winter weather of late December 1982 and early January 1983 made it easy to obtain litter and soil samples for extraction of overwintering ground beetles. Collections of this nature are desirable in order to positively confirm the hibernating status of Michigan carabid beetles. As an added benefit, the collections also produced several specimens of rare species which had not been previously collected by other methods (blacklighting and hand collecting) in the same areas during the spring and summer of 1982.
Dunn, Gary A.
"Collections of Hibernating Ground Beetles (Coleoptera: Carabidae),"
The Great Lakes Entomologist: Vol. 16
, Article 6.
Available at: http://scholar.valpo.edu/tgle/vol16/iss1/6