An excellent piece of work, which includes an account of the plague fleas.

8. Jordan and Rothschild (1906), A Revision of the Sarcopsyllidæ. Thompson Yates and Johnston Laboratories Reports, Vol. VII., p. 15. Plates. Bibliography.

The best modern account of the chigoes.

9. Baker (1904), A revision of American Siphonaptera or Fleas together with a complete list and bibliography of the group. Proc. U.S. National Museum, Vol. XXVII., p. 365. Plates. Bibliography of special papers only.

The earlier references, beginning 1699, mostly from Taschenberg.

10. Baker (1905), The Classification of the American Siphonaptera. Proc. U.S. National Museum, Vol. XXIX., p. 121.

Gives an index of hosts and their fleas. Additional bibliography.

11. Rothschild (1898), Contributions to the knowledge of the Siphonaptera. Novitates Zoologicæ, Vol. 5, p. 533; (1900) Further Contributions, etc., Vol. 7, p. 539; (1903) Vol. 10, p. 317; (1904) Vol. 11, p. 602; (1905) Vol. 12, pp. 153 and 479; (1907) Vol. 14, p. 329; (1909), Vol. 16, pp. 53, 57, 61, and 332; (1906) Notes on Bat-fleas, Vol. 13, p. 186.

These papers contain, for the most part, descriptions of new species in the writer’s collection. Many fine plates illustrating morphology and structure of the external skeleton.

B. The following references are to papers on the systematic position of the Siphonaptera and their relationship to other insects.