192 S. H. SCUDDER ON FOSSIL INSECTS FROM ILLINOIS. 



each wing at its widest point, probably the same as that between the margins of the wings 

 at rest at their widest point, is .85 in.; the distance between the origin of the principal 

 branch of the v. scapularis of the upper wing and that of its second branch is .53 in. ; the 

 greatest width of the space between the v. scapularis and its principal branch in the upper 

 wing is .11 in.; and the distance between the v. scapularis and the margin at this same 

 point is .09 in. The figure answers better than description. 



In this specimen the right upper wing overlaps the left upper wing, and the insect is 

 seen from above. 



Explanation of Plate VI. 



Fig. 1. — The right upper wing of Hemeristia occidentalis restored, magnified H diameters. 

 Fig. 2. — Restoration of Miamia Bronsoni, magnified 2 diameters. 



The dotted lines in these two figures show the conjectural parts. 

 Fig. 3. — The four wings of Hemeristia occidentalis as seen in the fossil, magnified lh diameters. 

 Fig. 4. — The veins of the wings only of Miamia Bronsoni, as they appear in the fossil, magnified 2 diameters. 



Published December, 18G6. 



