Xos. 622-623] SHORTER ARTICLES AND DISCUSSION 551 



produced were on one occasion counted, 26-14-20-20-17; usually on a 



before ceasing a few seconds. The song is rapidf the sounds being 

 emitted on warm evenings about 3 to the second. 



When stridulation has become fairly established in a colony 

 of these locusts, for the evening, it is likely to be continuous, for 

 if some singers cease their notes briefly, others take it up. 

 Relm and Ilebard. in the publication mentioned above, have also 

 noted this behavior and say: 



the constantly rising and falling song, but at no very great distance the 

 song is inaudible. 



In the colony observed by the writer at Vinson Station, Va., 

 three individuals which were somewhat isolated from the rest 

 maintained a perfect rhythmic synchronism for many minutes 

 at a time, including in this period many hundreds of consecutive 

 notes. Now and then all three would be stridulating at the 

 same time, then only two would produce their notes, yet the same 

 perfect rhythmic synchronism was always evident. Sometimes 

 all but one would cease to stridulate, then one or both of the 

 others would again take up the rhythm with a precision that was 

 marvelous. It did not matter how often one or another indi- 

 vidual joined the chorus following a pause, the notes were always 

 perfectly synchronous from the start and the rhythmic synchro- 

 nism was maintained. 



A representation of this perfect synchronism which was evi- 

 dent as the different "singers" took up the rhythm from time to 

 time may be shown graphically with dashes as follows : 



On several different nights I observed the same marvelous 

 rhythmic synchronism in this particular group of individuals. 

 Although other groups were "singing" elsewhere, it appeared 

 tigoniicte : A Synopsis of the Species of tbe Genus Neoconoceplialus found 

 in North America, North of Mexico," in Trans. Ent. Soc, 40, Jan. 6, 

 1915, pp. 365^13. 



