Distribution of Allonemobius socius in North America north of Mexico

Description:

Version of manually-generated dot map displayed above, showing U.S. and Canadian records, was harvested from SINA on Aug-05-2018.

Allonemobius socius and A. fasciatus have no identifying morphological features nor can males be distinguished by their calling songs. The two species were originally distinguished by allozyme assay (Howard 1983) and, in those areas where both species occur, allozyme assay remains the only way to tell them apart. However, studies in the eastern states have shown that A. socius and A. fasciatus are southern and northern species respectively, which overlap in their distributions narrowly in Illinois and New Jersey and broadly in West Virginia (Howard & Waring 1991).