INSECTS 



tone becomes also less sharp and piercing. The song 

 may be written tzeet-tzeet-tzeet-tzeet-tzek-tzek-tzek-tzuk-tzuk, 

 though the high key and shrill tones of the notes must be 



Fig. 23. The larger angular-winged katydid, Microcentrum rhombijolium 

 Upper figure, a male; lower, a female 



imagined. Riley describes the song as a series of raspings 

 "as of a stiff quill drawn across a coarse file," and Allard 



[42] 



