Zoology of Colorado - Cockerell, Theodore D. A. (Theodore Dru Alison), 1866 -1948 (University of Colorado, 1927)

Zoology : a systematic account of the general structure, habits, instincts, and uses of the principal families of the animal kingdom - Carpenter, William Benjamin, 1813 -1885 (Wm. S. Orr, 1848)

Die Zweiflügler des Kaiserlichen Museums zu Wien - Brauer, Friedrich, 1832 -1904 (K.K. Hof-und Staatsdruckerei, 1883)