L.  Cheng and Mathis, W. N., ?Marine insects of Guam: Heteroptera and Diptera?, Micronesica, vol. 35-36, pp. 514-522, 2003.

G. A.  Foster and Mathis, W. N., ?A revision of the genera Pelomyia Williston and Masoniella Vockeroth (Diptera: Tethinidae)?, Smithsonian Contributions to Zoology, vol. 619, p. 63 pp, 2003.

W. N.  Mathis and Trautwein, M., ?A revision and phylogenetic study of Lipochaeta Coquillett (Diptera: Ephydridae)?, Proceedings of the Entomological Society of Washington, vol. 105, pp. 30-49, 2003.

W. N.  Mathis and Winkler, I. S., ?A review of the Neotropical species of Brachydeutera Loew (Diptera: Ephydridae)?, Proceedings of the Entomological Society of Washington, vol. 105, pp. 407-424, 2003.

W. N.  Mathis and Zatwarnicki, T., ?Shore flies of the Republic of Seychelles (Diptera: Ephydridae)?, Annales zoologici. Warszawa, vol. 53, pp. 585-650, 2003.