1910] Mvttkowxli. Notes on TricJwcnemis Aliena Scudder. 109 



From the table it appears, that aliena can be placed with nei- 

 ther Argia or Hesperagrion, although in its important features 

 it seems more nearly allied to the former. Yet the absence of 

 apical multiplication of cells in the fossil (by no means an unim- 

 portant feature), the relation of Cu to the subquadrangle, and 

 the quadrangle itself, would tend to show nearer kin to Hespera- 

 grion. Assuming that Scudder's figure is correct in these essen- 

 tials, the fossil occupies a position intermediate between Argia and 

 Hesperagrion, combining elements of both genera. 



If Scudder's Trichocnemis hypothesis is not allowed, aliena 

 stands without a genus name ; which, however, can be authorita- 

 tively given only after a careful study of the fossil, and not of the 

 figure alone. 



Public Museum, Milwaukee, Wis. 



June 13, 1910. 



