Eiving — New North American Acarina. 77 



EXPLANATION OF ILLUSTRATIONS. 



PLATES VIII-XI. 



After drawings made by the author. 



Plate VIII. — 1, Cheyletns longipalpus, right palpus, X 340.— 2, Rhyn- 

 cholophus tridentifer, ventral view of right palpus, X 340. —3, Rhyncho- 

 lophus tridentifer, seta from body, X 340. —4, Rhyncholophus pollicaris, 

 last three segments of palpus, X 340. —5, Rhyncholophus parvisetosus, 

 right palpus from above, X60. — 6, Rhyncholophus longitarstis, tarsus and 

 tibia of leg I, X 60. —7, Rhyncholophus erythreus, last three segments of 

 anterior leg, X 60. —8, Rhyncholophus quadriocnlus, last three segments 

 of leg I, X60. — 9, Rhyncholophus quadriocnlus, last three segments of 

 left palpus, X 340. 



Plate IX, —10, Rhyncholophus brevitarsus, last three segments of leg I, 

 X60. — 11, Rhyncholophus brevitarsus, dorsal view of body, X 60. —12, 

 Rhyncholophus leprosus, tarsus and tibia of leg I, X60. — 13, Rhyncholo- 

 phus parvipollicus, last three segments of palpus, X 340. —14, Smaris 

 longilinealis, mouth parts protruded, X60.— 15, Trombidium subnigruw, 

 left eye-stalk with its two eyes, X 340. —16, Trombidiiim Tuissouriense, 

 seta from body, X 340. —17, Macrocheles clavisetosus, leg I, X 60. —18, 

 Macrocheles clavisetostts, palpi and mandibles, X 60. —19, Macrocheles 

 muscorum, left mandible, X 340. 



Plate X.— 20, Laelaps magnichela, chelae of the mandibles, X340. — 

 21, Laelaps mandibularis, leg I,X340. — 22, Laelaps flatnis, dorsal view 

 of the body and mouth parts, X 60.— 23, Hyletastes missouriensis, tarsus 

 and part of tibia of leg I, X 340. —24, Gamasus uncornutus, mandibles and 

 palpi, X 60. —25, Gamasus oblongus, right mandible,X340. — 26, Gamasus 

 unicornutus, anterior leg, X60. — 27, Hyletastes missouriensis, outline of 

 the body and peritreme, X 60.-28, Gamasus magnicomutus, right second 

 leg of the male, from above, X 60. —29, Uropoda cribraria, ventral sur- 

 face of female, X 60. 



Plate XL— 30, Uropoda folsomi, sternum of female showing epigynium 

 and coxae of legs, X60. — 31, Uropoda illinoiensis, tarsus and tibia of leg 

 I, X 60. —32, ?7?-o/?orfa /?<sea, left peritreme from above, X 340. —33, Uro- 

 poda fu sea, last three segments of leg I, X60. — 34, Uropoda pallida, 

 ventral view of the body of the male, X 60. —35, Uroseius badius, tarsus 

 and tibia of leg I, X 340. —36, Dinychus ovatus, peritreme from above, X 

 340.-37, Oribata oblonga, pseudostigmatic organ, X 340. —38, Tyrogly- 

 phus magniseotsus, tarsus of leg I, X 340. —39, Ridzoglyphus oblongus, 

 tarsus of leg 1, X 340. 



Issued August 16, lOO'J. 



