2 5 2 



ORTHOPTERA 



In the genus Pyfgomantia (Fig. 142, P. singularis, female) 

 the male has the tegmina and wings of normal size, while in 

 the female they are rudimentary. 



The variety of shape and external appearance in this family 

 is very great ; de Saussure considers it to be a mimetic group. 

 In certain species some parts of the body more especially the 

 tegmina have very much the appearance of foliage, and usually 

 in such cases this appearance is confined to the female, the males 

 in this family having, as we have said, the organs of flight more 

 transparent and colourless ; in the former sex the alar organs, 



FIG. 142. Pyrgomantis singularis, 

 female. S. Africa. (After West- 

 wood. ) 



FIG. 143. Outline of Chaeradodis 

 cancellata ?, nymph. (After 

 Wood- Mason.) 



when present, are frequently but little adapted for flying. In 

 some species the prothorax is expanded at the sides (Fig. 135, 

 Deroplatys saraivaca ; and Fig. 143, Choeradodis cancellated), and 

 in such cases the outline of the natural thorax if we may use 

 such an expression may be detected occupying the middle of 

 the unusual expansion. The European Mantis rcligiosa varies 

 much in colour ; in some examples the tegmina are leaf-green, 

 while in others they are brown or gray. There is some evidence 

 extant making it probable that in some species the colour of an 

 individual changes at different times Colonel Bowker saying of 



