STUDIES IN TETRAG0NEUR1A ( ODONATA ). II 
By Richard A. Muttkowski 
The first, part of the “Studies” was completed in June 1911 
and published in November of the same year (this Bulletin, 
(2) 9, pp. 91-134). At the time the “Studies” were regarded 
as completed; but the receipt of certain materials from Dr. Cal- 
vert while the paper was in press caused the writer to withdraw 
the bibliography from the article and to note “To be continued” 
at the end of his article. Because of a number of reasons the 
present second part was not finished definitely until recently. 
Dr. Calvert’s material 1 was all the more important as it seemed 
in some respects to overthrow the conclusions offered in the part 
already in press, pertaining specially to T etragoneuria semiaquea. 
It was only after careful study that the writer felt assured and 
permitted part one to be published. 
Since that date (1911) I have had repeated occasion to examine 
additional material and to test the accuracy of my assumptions 
as to the specificity of the forms of T etragoneuria: I see no reason 
to change the stand formerly taken, except in the case of T. semi- 
aquea already mentioned. 
Tetragoneuria Stella Williamson. 
Dr. Calvert’s material contained twelve specimens, all collected 
at Thomasville, Ga., in March, 1904, as follows: 
March 16th, 1 c?; 17th, 4 <?; 24th, 2 d\ 2 $ ; 25th, 1 d\ 1 $ ; 28th, IV. 
Tetragoneuria semiaquea Bunneister. 
Because of the importance of this material it is discussed in 
more detail. In the key for the species of Tetragoneuria (p. 95 
1 Through one of the most unfortunate accidents Professor Calvert’s valuable material has 
been completely destroyed. Only a. single T. Stella escaped destruction. This accident occurred 
only recently, after the manuscript had been completed for some time. However, the loss of 
the material does not invalidate the records and general results. 
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