8 E. B. WiLIJAMSON 



Organization of Resui^ts 



This paper originated in my efforts to identify pr(jperly specimens in my 

 own collection and its purpose is to facilitate identifications by other stu- 

 dents. It makes no attempt to summarize completely the extensive litera- 

 ture on these species and it should therefore be regarded as supplemental 

 to the other literature. To make it as useful as possible for the purpose for 

 which it has been prepared dififerent parts of the paper are designed as a 

 check on other parts. For example, in the keys to species the least possible 

 use has been made of venational characters and of male appendages. The 

 tabulation of the venational characters and the figures of appendages there- 

 fore will serve as checks on determinations made by the key. In the text 

 under each species are given data on size, form and size of female appendages 

 where known, and in some cases additional data designed to facilitate identi- 

 fication of material, and notes on habits, colors in life, etc. As a check on 

 my own determinations I have listed all the material studied by myself, but 

 I have not summarized all the records gathered by others, since as stated 

 above this paper is merely supplemental to the other literature. 



The abbreviations used in designating various collections have been 

 mentioned above in the paragraph under acknowledgments ; E. B. W. refers 

 to my own collection. Dr. Walker's use of certain letters in designating 

 abdominal spots, as explained by him (see under his name in the biblio- 

 graphy) has been frequently used in this paper. All measurements are in 

 millimeters, and the length of the abdomen as given is in every case exclusive 

 of the appendages. Notes on colors of living specimens must not necessarily 

 be considered complete. For example, failure in any case to mention 

 pseudopupillae must not be taken as evidence that these are lacking. Field 

 notes are often made under unfavorable circumstances, and I have often 

 found myself regretting the lack of detail or lack of definiteness which the 

 notes sometimes show. In some cases I have slightly re-edited these notes 

 but in no case has anything been added to them. 



In the field only a small hand lens was available for examining material. 

 Later studies have been made with a Zeiss binocular, using the number 2 

 eyepiece and the F 55 and Ao objectives. 



Specimens in the de Selys CoeeEctiqn, Following Martin's Revision, 



UNDER THE Labels Triacanthagyna trieida and 



Gynacantha satyrus 



Several months after this paper had been completed and sent to Dr. 

 Ruthven for publication Mons. Severin kindly sent me for study the thirty- 

 two specimens in de Selys collection under the label T. trifida and the 

 six male types (not seven, as stated by Martin) of G. satyrus. Six species 

 are included in this lot of thirty-eight specimens. In order to avoid as much 

 as possible the rewriting of several parts of my manuscript, already long 

 since completed, these specimens are considered one by one in this section of 

 my paper, and only the changes rendered imperative in the text are made. 

 These changes have to do with Triacanthagyna (Gynacantha) satyrus Martin. 



