1909.] PUBLIC DOCUMENT — No. 31. 207 



though close watch was kept. From this it wonhl seem that the 

 brood had died out in Massachusetts, but careful watch should 

 be kept at the next occurrence, in 1920. 



1851. (Riley, XXII.) Brood X. 

 Bristol. 1919. 



Occurrence. 

 Rutland, Vt., 1851, 1868; Bristol County, Mass., 1834. 



This is the largest brood of the seventeen-year broods, and 

 equals, if not exceeds, in extent the largest thirteen-year brood, 

 — brood IX. Its representation in Massachusetts, however, is, 

 if authentic and still active, — which is very doubtful, — small 

 and of no importance. The brood has been well recorded in the 

 east from 1715 to 1902, the date of its last appearance. It 

 occurs from Alabama and Wisconsin to jMassachusetts, in greater 

 or less numbers, and in 1851 and 1868 aj^peared at Rutland, 

 Vt. According to Dr. Fitch, " What appears to be a detached 

 branch of this brood occurs in the southeastern part of Massa- 

 chusetts." It is probable, however, that there was some mistake 

 about this occurrence. 



1843. (Riley, XII.) Brood II. 

 New York and Connecticut near Massachusetts State Line. 1911. 



Occurrence. 



New York: Copake, 1877; Hillsdale (millions), 1894. 

 Connecticut: New Haven, 1724, 1894; Southington, 1894; New 

 Britain, 1894; Farmington, 1894; Winsted, 1894. 



This is one of the best-recorded broods, being distributed 

 from New York and Connecticut to North Carolina, with iso- 

 lated swarms in Indiana and Michigan. While no colony of 

 this brood has been reported in Massachusetts, they come so 

 close to the State line on the southwest that stragglers, at least, 

 must have crossed into Massachusetts. At Copake, and espe- 

 cially at Hillsdale, N. Y,, in 1894, there were vigorous colonies 

 within 11/4 miles of onr State line, while in Connecticut, at 

 Winsted, they came within 7 miles. Careful inquiry from the 



