222 NATHAN BANKS. 



thorax : body with a few scattered bristles more iiumerons at tip, wliere they 

 form a cluster each side; legs with a few bristles, the first pair the longest, 

 slightly longer than the body ; femur i as long as femur, patella and tibia ii ; 

 leg iv as long as body, the femur very greatly thickened. Palpi short; first 

 joint minute; second three times as long as broad, curved, with a hair on outer- 

 side; third joint about same length, with two bristles near tip; fourth about 

 one-half as long as third and much narrower, with about five stiff bristles at and 

 near tip. 



Sea Cliff, N. Y. This is found in the same places as L'mopodes, 

 and can run with remarkable swiftness. 



Rliagidia. psillida nov. sp. — Length .7 mm. Pale hyaline or whitish. 

 Body oblong, distinctly divided into cephalothorax and abdomen; the cephalo- 

 thorax a little longer than broad, broadest behind, truncate in front, with an eye 

 near each posterior angle; abdomen broadest at base, then becoming much nar- 

 rower with concave sides, the apex broadly rounded. Legs stout, but joints not 

 thickened, hind legs longest, a little longer than body, first jiair about the length 

 of body. Body and legs with scattered bristles; mandibles very large, chelate, 

 nearly as long as the cephalothorax, bent downwards, a fine hair above just 

 before tip, the branches of mandibles without teeth, strongly curved. Palpi a 

 little longer than mandibles; joint short; second three times as long as broad; 

 third about one and one-half times as long as broad, with two bristles; fourth a 

 little longer than third and pointed, with about six stiff bristles at tip and two 

 near the base. 



This is a most reinarkable mite, its great resemblance to a Sol- 

 pugid suggested to Thorell the generic name, Rhagldia diminutive 

 for Rhax, a genus of Solpugidie. In fact, 1 consider this mite as the 

 key to the systematic [)osition of the Acarina. 1 cannot help believ- 

 ing that the mites came from a form closely resembling the modern 

 Solpugids. It lives on the ground under dam[) boards or stones. 



Sea Cliff, N. Y. ; Washington, D. C. ; Franconia, N. H. (Slosson). 



