Smithsonian Report, 1928. — Allard 



Plate 2 



1 Teeth of File Veins of Oblong-winged Katydid, Amblycorypha 



oblongifolia 



■Magnified about one hundred and eighty-five times. The teeth are very heavy and broad in 

 comparison with the teeth on a tree cricket's file vein. (Photograph by Ernst Artschwager) 



2. Teeth of File Vein of Tree Cricket, Oecanthus nigricornis 



Magnified about one luuKireil and eigl)ty-fi\e times. ( I'hotograpli by P'rnst Art-'-'chwager) 



3. Musical Organs of Larger Angular-winged Katydid, Microcentrum 

 rhombifolium, Male 



A, file vein, FV, on under surface of upper tegmen, showing teeth; B, scraper, a chitinous ridge at 

 S situated on the upper edge of the lower tegmen. Magnified about ten times. (From Scientific 



Monthly, July, iy28) 



