During the spring and summer of 1958, wild rodents were trapped in the vicinity of Sullivan, Illinois, as part of a leptospirosis survey under the direction of Drs. Deam H. Ferris and Lyle E. Hanson of the University of Illinois College of Veterinary Medicine and Dr. Rexford D. Lord, Jr. of the Illinois State Natural History Survey. When the rodents were brought to Urbana for examination, an opportunity to examine them for coccidia was afforded us. The present paper describes five species of coccidia including three new species found in 16 deermice (9 Peromyscus maniculatus and 7 P. leucopus).