SUMMARY.1. A list is given of the mites most commonly found in houses. The most important of these is Glycyphagus domesticus, the furniture mite, and this has been mainly studied during this investigation.2. An account is given of the occurrence of G. domesticus in houses and the conditions under which it is found.3. The life history is described. It is characterised by the occurrence of the hypopus, a cyst‐like stage which is found only amongst the Tyroglyphidae.5. Humidity and temperature have a marked effect on the life of the mite. Tables are given showing the effect of (a) humidity on the adult, (b) humidity and temperature on the hypopus and egg.6. Some experiments on the effect of carbon tetrachloride and methyl salicylate on the hypopus are recorded.
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