Mayer. — Color and Color- Patterns, 



PLATE I. 



Abbreviations. 



B. Back surface covered with wings. 0. Orifice for admission of light. 

 F. Front surface covered witli wings. S. vSpectroscope. 



Arrow indicates directions of rays of liglit. 



Fig. 1. Perspective view of spectroscopic apparatus used in determining the 



composition of the colors of Lepidoptera. 

 Fig. 2. Horizontal section of same. See p. 175. 

 Fig. 3. Pendulum used in determination of the frictional resistance between 



the air and the wings of Lepidoptera. See p. 193. 

 Figs. 4, 5. Diagrams to illustrate Keeler's method of projection, as applied to 



Lepidoptera. See p. 207. 



