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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 106 



Scioto County, Ohio, the hosts were trapped in timothy meadows 

 invaded by dewberry, blackberry, greenbriar, sumack, and locust. 

 In all situations the soil was clay-loam and the ground was wet 

 with winter rains. Hosts were trapped in runways on the surface. 



The Scioto County collections were made from two specimens 

 of Microtus which had been kept frozen very hard by the collector 

 for five and seven days before the chiggers were removed. The 

 chiggers were alive when removed. 



Collectors recorded that E. diversa diversa infested the ears of 

 the hosts. 



12b. Euschongastia diversa acut<i, new subspecies 



Figures 4,&, Q,a,h; Plates 4, 1, 14 



Description : Size : Length, 270 to 675 ; width, 170 to 430. 



Shape : Ovoid to oval. 



Color : As in E. rubra. 



Gnathosoma: Tendency to fewer setules on palpal setae than 

 in E. rubra, but not so much reduced as in E. diversa diversa. 

 Seta on palpal genu with 8 to 20 or more setules in two or three 



Table 10. — Distribution of setules on lateral seta of the palpal tibia by the 

 pair of setae per specimen for 31 specimens of E. diversa acuta 



rows on the outer curvature. Lateral seta on palpal tibia usually 

 nude (table 10 ; fig. 6,b), but not to the degi-ee found in E. diversa 

 diversa; setules frequently tiny. Palpal claw longer and smoother 

 than in both E. rubra and E. diversa diversa; the two accessory 



Table 11. — Distribution of setules on the galeal setae by the pair of setae per 

 specimen for 31 specimens of E. diversa acuta 



(Each figure is the number of setules on one seta of the pair; x indicates a missing Beta) 



prongs arise on distal half and usually lie close, interrupting the 

 taper very little. Galeal seta with fewer setules (table 11; fig. 

 6,a) than in E. t^bra but more than in E. diversa diversa; ten- 

 dency to four or five setules. 



