5 0 
Bulletin Wisconsin Natural History Society [Vol. 13, No. 2 
of the ‘‘Studies”) T. semiaquea is given under “CC. Color of 
hind wings reaching nodus.” 
If this key were applied to the material on hand some of it 
would fall under T. semiaquea, while a portion would be referred 
to division “C” of the key which would bring the specimens under 
T. Simula ns. 
In another part of the “Studies” (p. 106) under T. cynosura 
it is stated, “Distribution and increase in color markings is from 
south to north — a striking phenomenon and the direct opposite 
of what we find in Epicordulia princeps.” Again, from page 118 
under T. semiaquea I quote the following: 
The identity of this species occasioned the most puzzling moments of 
the present study Leaving the semiaquea series — that is 
those specimens in which the color reaches the nodus — aside for the moment, 
it was immediately apparent that for the rest of the Tetragoneuriae the 
color development showed a progression from south to north 
Here, in the compass of a few miles, the same results were achieved which 
otherwise necessitated a broad geographical expanse of approximately a 
thousand miles. To coordinate this apparent fact with the real fact of 
color development from south to north seemed an impossibility. 
It will be recalled that it was pointed out that the solution of 
this apparent puzzle in distribution of species lay in the over- 
lapping of the distribution areas of two species, one of which was 
Atlantic, the other Transition to Carolinian. T. cynosura was 
stated to have its color development (on the wings) from south 
to north; that is, the southernmost specimens taken had very 
little or no color on the wing-bases, while the farther north the 
distribution progressed the farther out from the wing-base crept 
the color until it reached its climax in the form T. simulans. In 
this form in extreme specimens the color covered the wing-bases 
until the third and, in a few cases, fourth antccubitals. 
T. semiaquea was stated to have a limited range along the 
Atlantic coast, its apparent center of distribution being North 
Carolina, while a very few specimens had been taken farther 
north (from New Jersey, and one as far north as Massachusetts). 
Resuming the discussion of Dr. Calvert’s Georgia material, 
there is the following to be noted: 
1. The specimens all come from Thomasville, Georgia, near 
the Floridian boundary, and one of the southernmost localities 
from which T. semiaquea has been taken. 
