1926 ] Sequential Distribution of Formica exsectoides Ford 133 
Actual survey showed that the many mounds were dis- 
tributed differently from the mounds of 1905. The following 
table shows the changes in distribution: 
North Middle South 
Active Deserted Active Deserted Active Deserted 
1905 40 24 55 38 22 5 
1920 33 9 65 1 84 1 
Thus the deserted mounds of the north section had largely 
disappeared, and so had those of the middle region and of the 
southern region; however, the census of deserted mounds was 
not as accurate in 1920 as in 1905. 
The increase in active mounds was most pronounced in the 
southern settlement or village where the number jumped up 
from 22 to 84, nearly a 400% increase. 
There was also an increase from 55 to 65 in the middle region 
and a diminution in the north from 40 to 33. The increase was 
greatest in the south, great in the middle, and negative in the 
north. 
The shift of population from the north and the occupation 
of new mounds in the middle and south is shown at a glance in 
the first diagram, which shows by dots the mounds that were 
active in 1905 and by x marks the mounds deserted in 1905, and 
by triangles the active mounds of 1920 and by squares the in- 
active mounds of 1920. 
Many of the active and very many of the deserted mounds 
of 1905 were not extant at all in 1920. We see here that the more 
easterly mounds of the community had been abandoned, all the 
mounds of 1920 being to the west or to the south, -with few ex- 
ceptions. None of the deserted mounds became reinhabited as 
far as ascertained. After 15 years but two of the deserted mounds 
were still discernible as traces as indicated by a square enclosing 
an x. In 1920 three of the active mounds of 1905 had been de- 
serted as indicated by squares enclosing dots. After 15 years, 
some 25 mounds still remained active as indicated by triangles 
around dots. But very many of the active mounds, shown by 
the plain triangles, were new developments not directly con- 
nected with the mounds of 1905. 
The nearly pure constellations of these new mounds are, 
