NUMBER OF GENERATIONS ANNUALLY. 125 
other places. On October 12, 3 beetles were jarred from 60 trees in a 
sprayed orchard, and 1 beetle from 50 oak and hickory trees in 
adjoining woods. On October 14, 133 beetles were jarred from 104 
trees in a badly infested unsprayed orchard consisting of late varieties. 
The trees in this orchard had been bare of foliage for more than two 
weeks. On the same morning 144 beetles were jarred from 28 small 
oak trees in woods adjoining this orchard, showing a heavy migration 
to the woods. Thesame 104 peach trees were again jarred October 23. 
Only 30 beetles were taken, and only 7 beetles from 20 oak trees in the 
adjoining woods. On October 26 as many trees as possible were jarred 
in the woods adjacent to the regular jarred block of peach trees. 
Only 3 beetles were secured The last beetles of the season were 
jarred November 1, when 2 beetles were taken from the 104 trees in 
the unsprayed orchard previously mentioned. No beetles were 
secured in jarring 18 oak trees in the adjoining woods on the same date. 
This probably marks the complete entrance of the insect into hiber- 
nation. 
NUMBER OF GENERATIONS ANNUALLY. 
It has been accepted for years that there is but one generation of 
the curculio annually, though this was a much-disputed question 
among the earlier writers. Thus, the writer of an article in the 
National Gazette, which was reprinted in the American Farmer of 
November 15, 1830, states: ‘‘There are three generations of them 
during the five months of their existence above ground, and they 
are all very tenacious of life.’ Dr. Fitch ' believed the insect to be 
two-breoded each year, thesecond brood passing the winter in the larval 
condition under the bark of pear trees. He was led to this erroneous 
belief by the resemblance to the curculio crescent of a curved incision 
in the bark which he supposed was the egg puncture of the insect in 
question. The absence of fruit he thought necessitated this change 
in egg laying by this brood, and agreed with the earlier observations 
of Melsheimer that the curculio bred in the bark of peach trees. 
Dr. Trimble, as the result of observations, believed the curculio to be 
single-brooded, and this opinion was, in the main, accepted by subse- 
quent writers. Dr. Riley, however, in an anonymous communication 
under the signature of ‘‘V”’ in the Prairie Farmer for July, 1867, gave 
it as his conclusions that the insect was occasionally two-brooded. In 
his first Illinois report (1867), Walsh states his belief in the double- 
broodedness of the curculio, as follows: ‘‘I find there are two distinct 
broods of the plum curculio every year, the first of which comes out 
in the beetle state, in the latitude of Rock Island, IIl., from about 
July 19 to August 4, and the second from about August 23 to Septem- 
13d Rept. Ins. N. Y., p. 351, 
