The new species herein described are of interest, although we can only deal with females, as is so frequently the case with this genus. One species (I. kempi), allied to the North American I. angustus, comes from a hitherto unexplored region on the north-east frontier of India, having been collected by the Abor Expedition. Two species (I. daveyi and I. oldi) are from Africa, and offer a peculiarity of structure in that they possess anal grooves having the form of a horse-shoe, an appearance only hitherto observed in three other species of Ixodes, all of which are African. The fourth species (I. ricinoides) is from China, and is allied to our I. ricinus: