Four undescribed mites from rats are dealt with in the present note, one being a new species of Laelaps (Haemolaelaps), which has a wide distribution, occurring in Ceylon, India, Africa and South America; the three others are larval forms of TROMBIDIIDAE, and they are the first parasites of this kind to be collected in India; my best thanks are due to Dr. Nelson Annandale and Mr. F. H. Gravely for their kindness in sending me these interesting Acari. I must also thank Mr. Engel Terzi for his carefully prepared drawings of these species.