244 J. L. HANCOCK. 



PLATE VIII. 



Markings on the disc of pronotum of Tetiix showing evolution of the pijjnieuted 

 areas. From specimens iu the author's collection. 



Fig. 14. Unmarked, or primitive type. 

 " 15. Early type of pigmentation. 

 " 16, 17. 18, 19. Advancing stages of pigmentation. 

 '■ 17. In this type simultaneous pigment marking in front with the sjiots 



further hack. 

 " 20. Harris' type " Tftrix bilineatn." a variable form of marking of Tettix 



ormitiis. 

 " 21. Young of Tettix, a few days old. showing marking at a. 

 Figures drawn to uniform scale. 14-19 inclusive, from specimens of Tettix 



(jihlmsKs. Enlarged, original from nature. 



PLATE IX. 



Figs. 2.3-31(;. Cophalo-dorsal outline of diflerent forms of Tettix for comparison. 

 The figures are self-explanatory, original, from nature, enlarged. 



