NUMBER OF GENERATIONS ANNUALLY. 27 
proportions, some of the latter showing by their immature colors 
that they had but just passed the pupal stage. 
Hatching is not fully in progress in the Northeast before the 25th 
of June, only an occasional individual having passed the first molt 
before the 10th of July. In the hght of the information that has 
been gained by these observations, the occurrence of a second brood 
of young in northeastern Ohio is doubtful. 
The late Dr. J. A. Lintner, in his studies of the outbreak of this 
insect in New York State in 1882 and 1883, seems to have relied 
much on the published habits of the species farther west—as, indeed, 
the writer has himself done until recently—and made no exact 
studies of the species at that time; and in his annual report, where 
the outbreak is discussed, no absolute proof of the existence of a sec- 
ond brood in New York is presented. The occurrence of a second 
brood of young in northern Illinois, as indicated by Doctor Fitch, 
has always been considered as settled, and in a more northern lati- 
tude than northern Ohio, so that there must be some other influences 
besides latitude to account for the phenomenon. That the species 
has occupied this territory for many years is indicated by the obser- 
vations of Mr. E. P. Van Duzee, of Buffalo, N. Y., who wrote that 
the insect was as abundant twenty-three years ago as at the present 
time, so that whatever effect on the,insect the recent occupation of 
the country might have had, that effect has passed away and a con- 
dition of what we might call equilibrium now exists here. 
On July 7, 1889, in the extreme northern part of Indiana, the 
writer found an abundance of young which had not yet molted for 
the first time. Dr. A. S. Packard records adults as pairing at Salem, 
Mass., June 17, 1871, as quoted by Doctor Lintner, while the latter 
gentleman” records the young as occurring in Lawrence County, 
N. Y., about June 5, 1883. 
Hardly have the latest hatched young of the first brood developed 
to the adult before the young of the second brood begin to appear. 
In southern Ohio this is about the first week in August. Generally 
these young do little injury, because the wheat has long since been 
harvested and the corn is usually too far advanced and tough to 
offer a desirable source of food supply, except in cases where fields 
have been planted very late, and here the writer has known them to 
work considerable injury, especially in seasons of severe drought that 
prevented the rapid growth of the plants. Fall attacks on wheat are 
rare, and the injury is never of a serious nature, as it is usually the 
case that by the time the young wheat is large enough to invite attack 
the chinch bugs are searching for winter quarters. 
«Second Report State Entomologist of New York, pp. 148-164, 1885. 
b Loe. cit., pp. 158, 159, 164. 
