CONTENTS. Xlll 



PAGE 



CHAPTER VI. 



DEVELOPMENT AND IMMATURE STAGES. 



General . . . . . 126 



Ovum . ... 129 



Embryology 



Larva 



Nymph . 



Hypopial nymph . 



Development of reproductive organs . .174 



The ecdyses ...... 180 



PART II. 



SYSTEMATIC. 



Descriptions of Genera and Species. 



Preliminary observations ..... 185 



Tyroglyphidae, definition and division into sub-families . 190 



Lentungulinse ...... 191 



Genus Lentungula ..... 192 



Lentungula algirorans ... . 196 



Histiostomidse .... . 200 



Genus Histiostoma . . . 200 



Histiostoma rostro-serratum .... 208 



spiniferum ... . 215 



,, pulchrum . . . . .217 



pyriforme ... . 221 



Tyroglyphinse, division into genera . . . 224 



Genus Glycyphagus . . . 226 



Glycyphagus domesticus ..... 238 



., spinipes ..... 245 



plumiger ..... 250 



Canestrinii . ... 255 



palmifer . . .. . .260 



platygaster . . . 265 



dispar ... . 271 



Cratneri . . . . .275 



sciurinus , 283 



