While the sources of these collections vary in
latitude from that of the Poconos of Pennsylvania
to that of northern New Brunswick, there appears
to be very little change in clutch size in this range
of latitude. Thus the mean clutch size of 16 nests
of the black-throated green in the Poconos is 4.06,
while for the combined collections from Nova
Scotia and New Brunswick (12 nests) the mean
clutch is 4.17. The nests of the other species are
from a narrow range of latitude and would not be
expected to vary. Thus it was felt permissible to
combine the data from different latitudes.