ART. 8 CHIGGER MITES OF THE NEW WORLD EWING 15 



the middle prongs being the largest. Dorsal plate broader than long, 

 slightly incurved along anterior margin and produced backward 

 into an angle behind each pseudostigma and with a conspicuous V- 

 shaped signature present in posterior half. Setae along the anterior 

 margin of dorsal plate subequal and shorter than the postero-lateral 

 setae. Pseudostigmata situated less than their diameter from the 

 posterior margin of dorsal plate and about twice their diameter from 

 each other; pseudostigmatic organs capitate, pedicel being about as 

 long as diameter of head. Anterior and posterior corneas of eyes 

 subequal, contiguous. Dorsal abdominal setae about 60, and for the 

 most part arranged into five transverse rows. Legs moderate, last 

 pair longest; tarsus I with dorsal spine situated its length from the 

 base of the segment and with subapical seta moderate, somewhat 

 spinelike, and extending slightly beyond the base of the claws. 



Length of unengorged larva, 0.30 mm.; width, 0.19 mm. 



Type host. — A wood rat. 



Type locality. — Wilburton, Okla. 



Type s?^VZc.— U.S.N.M. No. 1023. 



Described from three specimens taken from type host, at type 

 locality, by G. W. Stiles, March 17, 1929 (Bishopp, No. 8268). 



NEOSCHONGASTIA SCELOPORI, new species 

 Plate 2, Figures 2, 3 



Palpi not angulate but rounded laterally, first and second setae 

 long, subplumose. Palpal thumb slightly swollen and extending to 

 middle of palpal claw ; the latter strongly curved and deeply trif ur- 

 cate distally, the middle prong being the longest and the other two 

 subequal. Chelicerae strongly curved, with the upper tooth very 

 small, sharp and procurved, and with the lower one larger, stout, 

 and directed backward. Dorsal plate but slightly broader than 

 long, both anterior and posterior margins being almost straight. 

 Median seta shorter than the antero-lateral ones and these slightly 

 shorter than the postero-lateral setae. Pseudostigmata situated 

 slightly behind middle of dorsal plate, and far laterally, near the 

 lateral margins of the same; in front of each is a diagonal straight 

 line. Pseudostigmatic organs with globose heads and pedicels equal 

 in length to the diameters of the heads. Posterior eyes smaller than 

 anterior but with corneas. Dorsal abdominal setae about 30. Legs 

 moderate; tarsus I peculiar in that subapical seta is situated on a 

 conspicuous tubercle, and part of the tarsus distal to it is attenu- 

 ated ; dorsal spine situated almost twice its length from base to the 

 segment. 



Length of partly engorged larva, 0.67 mm. ; width, 0.33 mm. 



Type host. — A lizard {Sceloporus spinosus). 



