1911] MuttkowsJci, Studies in Tetragoneuria. 99 



last six segments lost, female teneral and distorted, apices of left 

 wings gone. 



5^,3? and four wings of a $ , all collected by Mrs. Charles C. 

 Deam and in my collection : 4. $ West Palm Beach, Fla., Feb. 22 and 

 Feb. 24, 1904 ; one $ , Eockledge, Fla., March 2, 1904 ; 3 $ , Lantana, 

 Fla.. Feb. 23, 1904. 



Holotype $ , West Palm Beach, Fla., Feb. 22. 1904 ; allotype $ , 

 Lantana, Fla.. Feb. 23, 1904, Mrs. Charles C. Deam, collection E. B. 

 Williamson. 



This species is named for Stella Mullin Deam, who has col- 

 lected much botanical and zoological material in Florida. The 

 botanical material has been collected for her husband, Charles C. 

 Deam. I am indebted to her for the specimens of this new species 

 as well as for many other dragon flies from Florida. 



When I received these specimens in 1904 I thought they rep- 

 resented an undescribed species. One of each sex was examined 

 by Dr. Calvert and it was through him that I received for study 

 the specimens belonging to the Pennsylvania State Museum. 

 Later specimens were' sent to Dr. Ris for comparison with 

 material in the de Selys collection. After this examination by Dr. 

 Ris some new questions as to identity came up and specimens 

 were sent a second time to him. As a result of this double exami- 

 nation and study by Dr. Ris he sent me several closely written 

 pages of notes, representing a great deal of work and time on his 

 part. It is through his care and interest that I am now able, 

 seven years after first studying the material, to describe this 

 species as new. 



Dr. Ris's notes on Tetragoneuria have been turned over to 

 Mr. Muttkowski for a proposed revision of the genus. It is 

 interesting to note that Dr. Ris found stella in the de Selys col- 

 lection under the label cynosura. One of these specimens is from 

 Louisiana (Morrison), the other from Georgia (Morrison). In 

 Dr. Ris's opinion stella is quite distinct from all the cynosura 

 group by the form of the abdomen (narrow, not spindle shaped), 

 by the color of the abdomen, and by the superior abdominal 

 appendages of the male, which are longer and have a second 

 distal dilatation. — B. B. Williamson. 



I have the types before me and have compared them with 

 other material on hand. Mr. Wiliamson's species is well repre- 

 sented in the lots before me by the following specimens : 



