EXPLANATION OF PLATES. 



Figures 1-104 (Plates I. and II.) are from Cicada tibicen; Figures 105-244 (Plates 

 III.-V.) from Caluptenus femur ■ruhrum. All figures were drawn by means of an 

 Abbe' camera lucida. The tube was drawn, giving a length of 199 mm. Zeiss 

 lenses were used in all cases. Figures 14 and 108 were magnified 90 diameters ; 

 Figures 7, 8, 12, 13, and 19-22, 870 diameters ; Figures 227-229, 231, and 242, 1,080 

 diameters; Figures 62-77, 1,400 diameters; all other Figures, 680 diameters. 



