CHIGGERS — FARRELL 199 



Only one chigger was removed directly from a host. It was 

 found free on the fur near the anus of Pitymys. 



Remarks: The type specimen of E. carolinensis is an unen- 

 gorged, unattached specimen collected from soil (pi. 2). 



21. Euschongastia ohioensis, new species 



Figure 7,c 



Description : Size : Length, 240 to 675 ; width, 160 to 705. 



Shape: Oval to broad oval to almost square; specimens flat- 

 tened on sides sometimes wider than long. 



Color : Cream to opaque white. 



Gnathosoma: Generally similar to that of E. carolinensis. 

 Genual seta with fewer setules. Palpal claw usually slightly 

 curved; with five to seven prongs, three longer with the median 

 of these longest; form similar to that of E. setosa. Galeal seta 

 usually with two to five setules (table 15). 



Table 15. — Distribution of setules on the galeal setae of ten specimens of 

 Euschongastia ohioensis 



Number of setules Frequency Number of setules Frequency 



2 15 1 



3 7 ? 1 



4 10 



(Question mark indicates undetermined number of setules) 



Legs: Generally as in E. carolinensis. 



Scutum: Generally similar to that of E. carolinensis; larger. 

 Punctae usually visible. Anterolateral and anteromedian setae 

 similar to those of E. carolinensis; posterolateral setae with two 

 alternate rows of heavy setules spaced along lateral edges of the 

 side adjacent to body as the seta projects posteriorly; the por- 

 tions of the setae opposite to the body closely covered with small 

 setules. 



Standard data of the type specimen from Clermont County, 

 Ohio: 



AW PW AP SB ASB PSB AL AM PL S 

 66 97 22 35 25 7 54 32 65 35 x 11 



Summary of standard data of six specimens, including the type, 

 from over its range (AM's and S's from five specimens) : 



AW 66-78, mean 72.2; PW 90-113, mean 104.2; Ap 21-26, mean 

 22.8; SB 32-44, mean 37.2; ASB 25-31, mean 27.5; PSB 7-10, 

 mean 8.2; AL 44-58, mean 53; AM 32-32, mean 32; PL 60-66, 

 mean 63.2; S 35-36, mean 35.4. Width of head of sensilla in five 

 specimens, 11 to 13, mean 11.8. 



