The record of Panama appears to be a misidentification by Banks 1929 based on two females from Barro Colorado Island, and the actual valid species (predominantly from Southeastern Brazil) is likely not present in the Central American zone.
Note: The suggested location of this species Central America (Panama) could be due to a misidentification in Banks 1929. He reports two females from Barro Colorado, Panama, and further indicates differences between the two specimens (We can therefore infer perhaps two different species?). Following Brescovit & Simó, 2007, C. medius actually ranges across the "Atlantic Forest on the coast of Brazil, from Espírito Santo to Rio Grande do Sul", which would encompass the original specimens of Keyserling (1891) from "Rio Grande (Dr. v. Ihering) and Rio de Janeiro (Prof. Göldi) 1 female". However, it therefore seems unlikely to range into Panama.