1915] Muttkowski: Studies in Tetragoneuria (Odonata) 
51 
2. A majority of the specimens belong to the color-type iS 
referred to on page 118 of the “Studies”— that is, “Color to 
nodus, then in a nearly straight oblique line past the triangle 
to the anal margin, usually leaving the lower end of the anal 
triangle free.” Such is the case in most of the Thomasville 
specimens. 
3. At least five specimens from Thomasville belonged to a group 
where the color did not reach the nodus. 
For convenience of study the specimens were grouped arbi- 
trarily as follows: 
Color-type A . Color reaching nodus, or less, but always reaching beyond 
the fourth antecubital. 
Material: March 18th, 1 d ; 21st, 1 d ; 25th, 5 d, 8 9 ; 28th, 1 $ ; 31st, 
1 d, 1 $• Total 18 specimens. 
Color-type B-A. 
Material: March 25th, 1 d • 
Color-type B. Color reaching beyond triangle to fourth antecubital. 
Material: March 16th, 1 $ ; 18th, 1 d ; 21st, 1 d, 25th, 1 d- 
Color-type C. Reaching third antecubital and tip of triangle. 
Material: March 28th, 1 9. 
In group A the color is often thinned out to such an extent 
that the markings represented a series of spots grouped around 
the antecubitals and various cross-veins at the bases of the wings. 
This, however, is due to juvenility, it appears to me, and not to 
any variability of the forms. Practically all of the specimens 
were young when caught; few had aged to any extent. 
The chief point of interest, however, is the disagreement of 
group B and C of the Georgia material with the 1911 key and 
description of T. semiaquea. On the other hand, they seem effec- 
tively to overthrow the specific relationship as restated in this 
paper for T. semiaquea and T. cynosura. 
While the first is very true, the relationship of T. semiaquea 
and T. cynosura is the same as before. On the contrary, this 
material instead of negating my assumption corroborates my 
previous findings: Distribution and color development is from 
south to north; that is, the farther north, the more color on the 
wings of a given species of Tetragoneuria. 
I wish to point out once more that the Thomasville specimens 
were taken at a point much farther south than most previously 
