Distribution of Eutarsopolipus (Acari: Podapolipidae) and Crotalomorpha Camini (Acari: Crotalomorphidae), Ectoparasites of Stenolophus (Coleoptera: Carabidae) in Michigan, U.S.A.

Three acarine parasites of Stenolophus spp are described from Michigan. Eutarsopolipus elzingai Husband (Acari: Podapolipidae), previously known from eastern Kansas, Eutarsopolipus brevichelus Husband and Husband, with one Michigan record, and Crotalomorpha camini Lindquist and Krantz (Acari: Crotalomorphidae), previously known from Kansas, Nebraska, Arkansas and Oklahoma, are widely distributed in Michigan as subelytral parasites of Stenolophus comma (Fabricius) (Coleoptera: Carabidae) and Stenolophus lecontei (Chaudoir), the seed corn beetle. Eutarsopolipus elzingai and E. brevichelus may occur occasionally on the same host beetle. ____________________ Mites in the family Podapolipidae (Acari: Tarsonemoidea) are parasites of insects, particularly Coleoptera. The family Podapolipidae was described by Ewing (1924). Previous records of the genus Eutarsopolipus in Michigan, all from carabid beetles, are: myzus group: E. regenfussi Husband and Swihart, from a single Chlaenius pennsylvanicus (Say)(Carabidae) collected in Cheboygan Co. and E. davidsoni Husband collected from Chlaenius sericeus (Forster) (Carabidae) in Barry, Cheboygan, Ingham, Luce and Macomb Counties; acanthomus group: E. porteri Husband from a single Harpalus herbivagus Say (Carabidae) collected in Kalamazoo Co.; pterostichi group: E. fischeri Husband from a single Harpalus pensylvanicus (DeGeer) collected in Ingham Co.; biunguis group: Eutarsopolipus brevichelus Husband and Husband collected from a single Stenolophus lecontei (Chaudoir) (Carabidae). Groups of Eutarsopolipus were proposed by Regenfuss (1968) and modified by Husband and Macfarlane (1999). Mites in the family Crotalomorphidae are parasites of stenolophine beetles (Carabidae). The family Crotalomorphidae was described by Lindquist and Krantz (2002). There are no previous records of Crotalomorphidae in Michigan. The purpose of this paper is to present and discuss distribution in Michigan of the three subelytral acarine parasites of Stenolophus comma (Fabricius) and S. lecontei: Eutarsopolopus elzingai Husband, E. brevichelus, and Crotalomorpha camini Lindquist and Krantz, and to provide figures to distinguish the three species. METHODS AND MATERIALS More than 500 pinned Michigan Stenolophus beetles were borrowed from the A. J. Cook Arthropod Research Collection of Michigan State University and the University of Michigan Museum of Zoology Entomology Collection. Stenolophus comma and S. lecontei from Michigan were examined for subelytral parasitic mites. Beetles were placed in hot water for about 1/2 h in order to lift elytra without damaging pinned specimens. Mites were visually removed or washed 1Biology Department, Adrian College, Adrian, MI 49221, U.S.A. , E-mail: husbandadrian@aol.com. 2346 Jamacha #61, El Cajon, CA 92019, U.S.A. , E-mail: davidhsbnd@aol.com. 1 Husband and Husband: Distribution of Eutarsopolipus (Acari: Podapolipidae) and Published by ValpoScholar, 2004 2004 THE GREAT LAKES ENTOMOLOGIST 11 from the beetles with 70% ethanol, mounted in Hoyer’s mounting medium, placed on a heating tray and later ringed with Glyptal insulating paint. Mites were examined with the aid of a Zeiss (Jena, Germany) phase contrast microscope with an ocular micrometer. The terminology for mite structures used here follows Lindquist (1986).