with the angle of light. when examined in sunlight all the dark portions of the plates possessed a marked irides- ence. At one angle the color of the plate was a beautiful blue; at another angle the color was light green. When examined out of the sun the color was a deep blue-black which however changed to a lighter shade when held at different angles. Along the inner basal edge, the majority of the plates have longitudinal bands of yellowish white, which shades into gray and finally runs imperceptibly into the blue black of the main plate. The width of the white & gray bands varies greatly; some plates had a white band 3 1/2 to 4 mil wide shading into a gray band of similar breadth. These were the most anterior ones of the row. Others had only a narrow edging of gray. My study of the taeen of No. 4 showed that these white basal stripes is widest at the anterior portion of the taeen row becoming less & less toward the back until it is lost entirely in the posterior 1/3 of the row. Three hundred & eleven plates were spread upon the slip to dry. Out of