CHIGGERS — FARRELL 



171 



Ventral setae: Form and arrangement similar to E. rubra 

 except for posteriors which have fewer, shorter, scalelike setules. 

 Total number fewer than in E. rubra. Data from 19 specimens : 

 Number of first sternals, 2 ; of second sternals, 2 ; of poststernals, 

 62 to 80. Length of first sternals, 39 to 60; of second sternals, 

 30 to 45 ; of setae from the middle of the first row of poststernals, 

 28 to 35 ; of posterior setae, 42 to 59. 



Material: Type, USNM 1993. Specimens from hosts: 



MicroUis ochrogaster okioneiisis 

 Ohio 



Scioto County: Mar. 10, 1949, 

 USNM-3, DU-5, CEF-1. 

 Clethriononiys g. gapperi 

 Pennsylvania 



Union County: May 15, 1949, 

 CEF-1; May 27, 1949, RML-2; 

 May 27-28, 1949, DU-1. 

 Neotoma magister 

 Pennsylvania 



Union County: May 16, 1949, 

 DU-2. 



Field mouse 

 Iowa 



Clarke County: Mar. 18, 1936, 

 USNM-6. 

 Microtus p. pennsylv aniens 

 Ohio 

 Clermont County: Mar. 15, 1948, 

 KU-1. 

 Synaptomys cooperi satxirahis 

 Ohio 



Clermont County: Mar. 15, 1948, 

 USNM-Type, DU-2, CEF-1. 

 Microtus ochrogaster 

 Ohio 



Clermont County: Jan. 3, 1949, 

 DU-3, Afr-1, Aus-1; Jan 4, 

 1949, Du-4, CEF-1, CM-2; 

 Jan. 16, 1949, DU-2. 



Seasonal distribution: E. diversa diversa has been collected 

 only during the winter and spring months, January, March, and 

 May. 



Geographic distribution: The known range of E. diversa 

 diversa, as it is here defined, extends in a band from Clarke 

 County, Iowa, in the v/est, through Clermont and Scioto Counties, 

 Ohio, to Union County, Pa., in the east (fig. 4,b) . 



Diagnosis: Euschdngastia diversa diversa can be distin- 

 guished from other members of the E. rubra group by the follow- 

 ing combination of characters: Nude lateral seta on palpal tibia, 

 reduced number of setules on the galeal seta, the form of the 

 palpal claw which branches in the proximal half with accessory 

 prongs interrupting the contour, and by its geographical range. 



Ecology: Mr. Woodrow Goodpaster supplied information con- 

 cerning the Ohio collections. 



The Synaptomys from which E. diversa diversa was collected 

 in Clermont County, Ohio, was trapped in a meadow of timothy, 

 bluegrass, blackberry, goldenrod, and sweet clover. Small elms 

 and locust were present in the meadow. The Mocrotus were taken 

 in the same locality or in rolling timothy-clover meadows. In 



