ANATOMY AND PHYSIOLOGY 105 
The tegmina are first spread a little; then, as they close gradu- 
ally, the scraper clicks across the teeth, making from twenty to 
thirty sharp “tic ’’-like sounds in rapid succession. This call 
guides the female to the male and when they are a few inches 
apart she makes now and then a short, soft chirp, to which he 
responds with a similar chirp, which is quite unlike the first 
Fie: 136, 
DH 
Stridulating organs of Microcentrum laurifolium. A, dorsal aspect of file (st) 
when the tegmina are closed; B, ventral aspect of left tegmen to show file; C, dorsal 
aspect of right tegmen to show scraper (s). 
call and, moreover, is made by the opening of the tegmina. 
These and other details of the courtship may readily be ob- 
served in twilight and even under artificial light, as the latter, 
if not too strong, does not disturb the pair. Something sim- 
ilar may be observed in the daytime in Orchelimum, Xiphidium 
and the tree crickets, Gicanthus. The stridulating areas are 
usually membranous and the rasping organs are modified veins. 
