Redescriptions of North American Smithuridae. J.W. Folsom pages 461-512

Observations on Hexamita mamotae, n.sp., a Protozoan Flagellate from the Woodchuck (Marmota monax Linn,). H.B. Crouch pages 513-518

An Entomotograph, an Instrument for Recording the Appendicular of Locomotor Activity of Insects. J. Franklin Yeager and Ralph B. Swain pages 519-526

Trypansoma iowensis n.sp. and Babesia citelii n.sp. from Citellus tridecemlineatus, and Trypansoma hixsoni n.sp. from Citellus franklini. Elery R. Becker and Robert L. Roudabush pages 527-532

The Development of Trypanosoma iowensis in the Blood of the Striped Ground Squirrel, Cittellus tridecemlineatus. Robert L. Roudabush and Elery R. Becker pages 533-536

Three New Trichomonads from Birds. Bernard V. Travis and F. N. Hamerstrom Jr. pages 537-543