LIST OF ILLUSTRATIONS. 



4r2l 



Sarcoptesscabiei, male, under side 292 



— — female, ditto . . 292 



— — two of posterior legs 



of male . . 293 



— — two of posterior legs 



of female . . . 293 



— — burrow of . . 294 

 Sarcoptes dromedarii . . . 305 



— mutans, male . . . 305 



— — female . . . 305 



— — side view . . . 306 

 Psoroptes equi, mandibles . . 308 



— — anterior leg and sucker 308 



— — figui-e of . . . 309 



— — two of posterior legs 



of male . . 309 



— — two of posterior legs 



of female . . . 309 

 Symbiotes bovis . . -3^3 



— — anterior leg and sucker 313 

 Sarcopterus nidulans . . . 314 

 Myobia musculi, young . .316 



— — female . . . 316 



— — mouth and anterior 



legs more highly 

 magnified . .316 



— — posterior leg and tarsus 316 

 English bat, magnified hair of .318 

 Otonyssus sticholasius, magnified 



hair of . . . 318 



— — magnified bristle of . 319 



— — tarsus of, copied from 



Kolenati . . .319 



— — — copied from Mad- 



dox. . . 319 



— — palpus, copied from 



Kolenati . . . 320 



— — mouth of do. . .321 



— — — more magnified . 321 



— — copied from Kolenati 323 



— — — — Maddox . 323 

 Peplonyssus seminulum . . 324 



— pagurus .... 324 



Listrophorus Leuckarti, mouth of 325 



— — leg of 



— gibbus . . . . 



— Leuckarti 

 Myocoptes musculinus, male . . 



— — female 



— — seen in front . . 



— — mouth of , 

 Dermaleichus bifidus, male 



— — female . . . 



— chelopus, male 



— — female . . . 

 Demodex folliculorum 



— — in bulb and follicles 

 of human hair . . . 



Lime tree leaf with nail galls 

 Section of gall on do. 

 American vine leaf with trumpet 



gall formed by a Cecidomyia 335 

 Section of gall on do. , . 335 



Sallow leaves with galls produced 



by Phytoptus salicis . 

 Section of gall on do. . 

 Phytoptus salicis 



— tiUce . 



— ribis 



— pyri . 

 Gamasus, supposed by Scheuten 



to be perfect insect of ditto 

 Hypopus, supposed by Scheuten 



to be larva of ditto. . 

 Flexipalpus tilias . 

 Tetranychus tilire, supposed by 



Scheuten to be perfect Flexi 



palpus tilice 

 Phytoptus, after Low . 



— head of — . 



— leg of — 



— tail of — . 



— pyri, claw of 



— tiliae, claw of . 

 Currant buds attacked by Phy 



toptus ribis . . • • 35 S 



325 

 325 

 325 

 326 

 326 

 326 

 326 

 328 

 328 

 329 

 329 

 330 



330 

 332 

 332 



337 

 337 

 339 

 339 

 339 

 340 



340 



341 

 342 



342 

 346 

 346 

 347 

 348 

 348 

 348 



