Ewing — New North American Acarina. 717 
EXPLANATION OF ILLUSTRATIONS. 
PLATES VIII-XI. 
After drawings made by the author. 
Plate VIII.—1, Cheyletus longipalpus, right palpus, < 340.—2, Rhyn- 
cholophus tridentifer, ventral view of right palpus, x 340.—3, Rhyncho- 
lophus tridentifer, seta from body, < 340.—4, Rhyncholophus pollicaris, 
last three segments of palpus, X 340.—5, Rhyncholophus parvisetosus, 
right palpus from above, < 60.—6, Rhyncholophus longitarsus, tarsus and 
tibia of leg I, < 60. —7, Rhyncholophus erythreus, last three segments of 
anterior leg, x 60.—8, Rhyncholophus quadrioculus, last three segments 
of leg I, X 60.—9, Rhyncholophus quadrioculus, last three segments of 
left palpus, < 340. 
Plate IX.—10, Rhyncholophus brevitarsus, last tires segments of leg I, 
< 60.—11, Rhyncholophus brevitarsus, dorsal view of body, < 60.—12, 
Rhyncholophus leprosus, tarsus and tibia of leg I, X 60.—13, Rhyncholo- 
phus parvipollicus, last three segments of palpus, X 340.—14, Smaris 
longilinealis, mouth parts protruded, «60.—15, Trombidiwm subnigrum, 
left eye-stalk with its two eyes, x 340.—16, Trombidium missouriense, 
seta from body, x 340.—17, Macrocheles clavisetosus, leg I, x 60.—18, 
Macrocheles clavisetesus, palpi and mandibles, x 60.—19, Macrocheles 
muscorum, left mandible, < 340. 
Plate X.—20, Laelaps magnichela, chelae of the mandibles, «340. — 
21, Laelaps mandibularis, leg I, <x 340.—22, Laelaps flavus, dorsal view 
of the body and mouth parts, < 60.—23, Hyletastes missourtensis, tarsus 
and part of tibia of leg I, x 340.—24, Gamasus uncornutus, mandibles and 
palpi, < 60.—25, Gamasus oblongus, right mandible, x340.—26, Gamasus 
untcornutus, anterior leg, <60.—27, Hyletastes missouriensis, outline of 
the body and peritreme,  60.—28, Gamasus magnicornutus, right second 
leg of the male, from above,  60.—29, Uropeda cribraria, ventral sur- 
face of female, x 60. 
Plate XI.—30, Uropoda folsomi, sternum of female showing epigynium 
and coxae of legs, x 60.—31, Uropoda illinoiensis, tarsus and tibia of leg 
I, X 60. —32, Uropoda fusca, left peritreme from above, < 340.—33, Uro- 
poda fusca, last three segments of leg I, <60.—34, Uropoda pallida, 
ventral view of the body of the male, « 60.—35, Uroseius badius, tarsus 
and tibia of leg I, K 340.—36, Dinychus ovatus, peritreme from above, < 
340.—37, Oribata oblonga, pseudostigmatic organ, x 340.—88, Tyrogly- 
phus magniseotsus, tarsus of leg I, x 340.—39, Rhizoglyphus oe 
tarsus of leg 1, « 340. 
Issued August 16, 1909. 
