^lUd3S 



ILLUSTRATIONS. 



TEXT FIGURES. 



Page. 



1. Dorsal view of a mite 8 



2. Ventral view of a mite 8 



3. Palpi of various form^ 9 



4. Legs of various mites 10 



5. Anatomy of Paras i^us 11 



6. 'Emhiy oi Parasitus 12 



7. A mite, Trombidium: Egg, larva, 



adult 13 



8. Venter of an eupodid 20 



9. A mite, AUchus roseus 20 



10. Cephalothorax of Bimichaelia 21 



11. Dorsal view of the mite Notophal- 



lus 21 



12. Linopodes antennaepes 22 



13. Rhagidia pallida 22 



14. Tydtus: Beak and leg I, from below. 22 



15. Eupodes: Legs I and IV 22 



16. Erynetes concolor: Tarsus and pal- 



pus --- 22 



17. Teneriffia: Palpus 23 



18. Cryptognathus lagenu 23 



19. Venter of a 5(fe?Za 24 



20. Y.gg oiBdella 24 



21. Bdclla peregrina 25 



22. Bdclla tenella 25 



23. Mandibles and palpus of Cunaxa. . . 25 



24. Cheyletussp - 26 



25. Cheyletus pyriformis: Beak and pal- 



pus, tip of leg I, and claws of leg II. 26 



26. Cheyletus audax, from below 27 



27. Chcylcticlla canadensis 28 



28. Chcletopsis norneri 28 



29. Harpyrynchuslongipilus: Female.. 29 



30. Harpyrynchuslongipilus: Larva... 29 



31. Psorergates simplex 29 



32. Myohia canadensis 29 



33. Picobiahelleri 30 



34. Picobiahelleri: Tarsus and head 30 



35. Venter of Anystis 30 



36. Tarsotomus spinatus 31 



37. Pterygosoma texana: Adult and de- 



tails 31 



38. Tetranychus bimaculatus 32 



39. Details of Tetranychus 32 



40. Details of Tetranychus 33 



41. Leg of Tetranychus 33 



42. Genital organs of Tetranychus 34 



43. Claws of Tetranychus 34 



44. Tetranychus gloveri: Palpus and 



mandibular plate 34 



45. Bryobia pratensis: Female and de- 



tails 35 



46. Bryobia pratensis: Larva 36 



Page. 

 Fig. 47. Stigmaeus floridanus: Adult and de- 

 tails 36 



48. Acheles 37 



49. Tetranychoides californica and pal- 



pus 37 



50. Raphignathus brevis 37 



51. Tetranychopsis spinosa 37 



52. Tenuipalpus californicus 3S 



53. NeophylJobius americanus and claw. 38 



54. Details of Erythraeus 39 



55. Atomus maculatus 39 



56. Leptusof -Eryrtraewsonaplantlouse 39 



57. Erythraeus simplex and palpus 40 



58. Venter of Smaris 41 



59. Caeculisoma: Tarsus 1 41 



60. Egg of Trombidium 41 



61. Eye of Trombidium 41 



62. Claws of Trombidium 41 



63. Leg I of Trombidium 42 



64. Mandible and details of Trombid- 



ium 42 



65. Larva (leptus) of a Trombidium 42 



66. 'Laxva oi Allothrombium and mouth 



parts 43 



67. Larva of Trombidium from cricket. . 44 



68. Trombidium locustarum 44 



69. Palpus of Trombidium giganteum . 44 



70. Palpus of Trombidium magnificum. 44 



71. Caeculus americanus 45 



72. Limnochares: Venter 46 



73. Limnochares: Eyes and dorsal plate 46 



74. Eylais sp 46 



75. Eylais: Eye plate 46 



76. Genital suckers of hydrachnids 47 



77. Arrenurus sp: Male 47 



78. Arrenurus sp: Palpus 50 



79. .4 rrmttru* sp: Female from below. 50 



80. Larva of a hydrachnid 50 



81. Carva of Hydrachna attached to leg 



of an insect; nymph inside 51 



82. Limnesia sp.: Palpus and co.xal 



plates 51 



83. Tyrrellia circularis 51 



84. Thyas sp 51 



85. Mandible of Thyas sp 51 



86. Palpus of Thyas sp 51 



87. Coxal plates of Hygrobates 52 



88. Palpus of Hygrobates 52 



89. Palpus oiAtractides 52 



90. Coxal plates of Sperchon 52 



91. Palpus of Sperchon 52 



92. Venter of Lebertia 52 



93. Piona sp., and palpus above 53 



3 



