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ANNUAL, REPORT SMITHSONIAN INSTITUTION, 1923 



or even on the porch and the screen doors. They usually make 

 their presence known by their soft but high-pitched notes resembling 

 tzeet uttered in short series, the first notes repeated rapidly, the 

 others successively more slowly as the tone becomes also less sharp 

 and piercing. This is the song of the larger species and may be 



Fig. 9. 



-The larger angular-winged katydid, Microcentrum rJiombifolium (one-fourth 

 larger than natural size). Upper, a male; lower, a female 



written tzeet-tzeet-tzeet-tzeet-tzek-tzek-tzek-tzuk-tzuk, though the 

 high key and shrill tones of the notes must be imagined. Riley de- 

 scribes the song as a series of raspings " as of a stiff quill drawn 

 across a coarse file," and Allard says the notes " are sharp, snapping 

 crepitations and sound like the slow snapping of the teeth of a 

 stiff comb as some object is slowly drawn across it." He represents 



