92 



Rowland M. Shelley 



Fig. 32. Comparison of the distributions of T. spinicaudus (vertical shad- 

 ing) and the eastern population of T. posticus (horizontal shading). 



ILLINOIS: Expected throughout most of the state except for the 

 northern and eastern peripheries adjoining Wisconsin and Indiana. 

 Cook, Greene, Jackson, Johnson, Monroe, Pope, and Union counties 

 (EIU, FMNH, INHS, NMNH, UMO). The northern- and easternmost 

 record is the neotype. 



IOWA: Expected in the southeastern 1/3 of the state. Storey Co., 

 Ames, 1 spmn., 1949, collector unknown (NMNH). Henry Co., Mt. 

 Pleasant, 2 spmns., date and collector unknown (NMNH). 



