134 Bulletin Wisconsin Natural History Society. [Vol. 9, No. 3. 



It is chiefly because of the length of the female appendages 

 that*I regard this species as distinct. These are the longest of any 

 known species of Tetragoneuria, the nearest species, spinigera, 

 reaching 3.3 mm. The length of the appendage as a character 

 is all the more certain, as the other species of Tetragoneuria 

 show much smaller differences among themselves (see the table 

 at the beginning of this paper). This same feature is also a 

 proof that costalis is not an ally of cynosura, as a subspecies of 

 which it has been considered by Selys and Martin ; its nearer 

 relation to spinigera and probably spinosa (of which the female 

 is unknown to me) is clearly indicated. 



Milwaukee Public Museum, June 29, 1911. 



(To be continued.) 



