Arthur L. E. Barron 



a. Nymph, ventral surface ( x i6) 



W. T. Tarns H'- T. Tarns 



b. Engorged adult from head of a willow-warbler, ( x 5-1), ventral surface and 



dorsal surface 



PlaU XXXII 



THE SHEEP TICK, Ixodes ricinus 



