40 PROCEEDINGS ENTOMOLOGICAL SOCIETY. 



some seconds this time-rhythm of all the singers would be so 

 perfect that a single great trill was heard each time. Occasion- 

 ally some slower or faster trillers would break up this rhythm, 

 but in a few seconds it was again restored as usual. I have 

 noted this marked synchrony among the colonies of singers in 

 the tallest oaks. 



A count of the trills of a single singer at different times gave 

 the following results: 176, 2UO, 198, 204, 204, 204 trills per 

 minute. For the size of this cricket, its notes are loud and 

 penetrating, and can be heard a considerable distance. 



Until 1907 this species of arboreal cricket had never been 

 described. In September of that year a male and a female 

 only were taken in the vicinity of Washington, D. C., and 

 given the specific name Cvrtoxipha colinnbiana by Mr. A. N. 

 Caudell, of the U. S. National Museum. These type speci- 

 mens, together with other individuals recently taken by the 

 writer in north Georgia, are in the collections of the U. S. 

 National Museum. It is thus evident that this Cyrtoxipha, 

 like the other two of this genus, will be found to be a South- 

 ern species, and Georgia has one more known cricket to add 

 to her insect fauna. I also heard its trilling late in the even- 

 ing far up into South Carolina from the Southern train on a 

 trip early in August from Gainesville, Georgia, to Washing- 

 ton, D. C. 



A common cricket at Thompson's Mills is the Pennsylvania 

 field cricket, Grv/lus pennsylvanicus Burmeister (fig. 6). 

 This is possibly the most common field cricket in this region 

 -a true ground dweller hiding beneath clods of earth, 

 leaves, dead grass, etc. They are day and night singers, al- 

 though they appear most musical about sundown and at night. 

 So widely distributed are these crickets throughout the fields 

 that one never gets out of earshot of some singer. A study 

 of this interesting field cricket in different localities and regions 

 of its range has finally led me to recognize two very distinct 

 songs one a weak almost continuous trill, the other a brief, 

 shrill chirp, similar to that of (?r\'l!us abhrcricttiis. At 

 Thompson's Mills the trilling form is almost the only one 

 heard. Its notes are a rather weak, shrill trill, prolonged 

 about four or five seconds, with a momentary pause. This 

 pause is so brief and abrupt that the notes may almost be de- 

 scribed as a single, prolonged trill indefinitely continued. The 

 trills of this form remind one very much of the trilling of 

 fKcautlms. quadripunctatiis. In the Thompson's Mills region 

 these are the first cricket notes of the spring time and are 



