List, of Illustrations. 



PAGE 



FIG 31.- Dermoglyphus elongatus. (a) Male ; (b) Female . . 49 



,, 32. Epidermoptes bilobatus, 9 . From below ... 50 



33. J ... 51 



,, 34. Listrophorid mite, showing distribution of tracheal tubes 52 



,, 35. Ohirodiscoides caviae. Ventral view of male . . . 52 



,, 36. Hypopial or travelling nymphs of Tyroglyphidae . . 53 

 ,, 37. Tyroglyphus longior, var. castellanii, c5 . Dorsal and 



ventral aspects . . . . . .' . 53 



,, 38. Glycyphagus domesticus . . . . . . 54 



?) 39. Cheyletid mites, (a) Psorergates musculi. Dorsal view 



of male, (b) Myobia sp. Dorsal view of male . . 55 



,, 40. Cheyletiella parasitivorax. Dorsal view of female . . 56 

 ,, 41. (a) Syringophilus bipectinatus. (b) S. columbae. Dorsal 



aspect of females . . . . ' . . . 57 



,, 42. (a) Tarsus of leg of Syringophilus bipectinatus . . 58 



(b) ,, ,, columbae . , - 58 

 ., 43. Tydeus molestus, 9 . From below, (a) Leg. (b) Palp, 



much enlarged . ... . . . . .58 



,, 44. Leptus (Trombicula ?) similis ...... 59 



,, 45. Schongastia americana ....... 60 



,, 46. Capitulum of Demodex folliculorum . . . .61 



,, 47. Dorsal spinule on capitulum (palp) of Demodex spp. . 61 

 , 48. Demodex canis, 9 . Ventral v.iew ; and capitulum from 



above . . ... . . . . .62 



., 49 Demodex equi. Male and female. Also capitulum from 



above 62 



,, 50. (a) Demodex canis, var. ovis. 9. From below . . 63 

 (b) Capitulum of same, from above, (c and d) Demodex 



phylloides, 9 . Dorsal and ventral aspects (e) D. cati, 



<5 , from above . . . . . . .63 



51. Demodex bovis. Ventral view of female, and dorsal and 



lateral views of male ... . . 64 



,, 52. Stages in life cycle of Demodex 65 



53. (a) Penis of Demodex cati. (b) Early larva of D. bovis. 



(c, d, and e) Penis of D. bovis 66 



.. 54. Anterior end of Dermanyssus, showing chelicerae in situ . 66 

 ,, 55. Dermanyssus gallinae, 9. Dorsal view . . . .67 



56. ,, ,,9. Ventral view ... 68 



57 - > 6 . . . 69 



58. ,, ,, Second nymph. Ventral view . 70 



,, 59. ,, ,, First nymph. Dorsal view . . 71 



60. Ventral view . . 72 



61. ,, ,, Larva. Dorsal view ... 73 



,, 62. Dermanyssus muris, 9 . Dorsal and ventral aspects . 74 



63. ,, sanguineus, 9 . Dorsal and ventral aspects 75 



" 64. ,, aegyptius, 9 ,, ,, ,, 76 



,, 65. Liponyssus bacoti, 9 . ,, ,, ,, 77 

 66. ,, bursa, 9 . Dorsal aspect . . . .78 



,. 67. (a) Sternal plate of Liponyssus bursa, 9 ... 79 



(b) ,, ,, ,, sylviarum, 9 . 79 



,, 68. (a) Posterior end of dorsal shield of Liponyssus bursa, 9 . 80 



(k) sylviarum, 9 80 



