with its congeners from April to September, by the sides of 

 streams and springs, running upon the surface of the water. 



Velia liivulorum and V. currens have been described by 

 Fabricius and other authors as distinct species ; but from the 

 remarks of my friends and my own observations, 1 am inchned 

 to beheve that the latter is only the pupa of the former. The 

 fact might easily be proved, by those residing m a convenient 

 situation confining a quantity of V. currens in a frame covered 

 with coarse gauze, and floating them where they have been 

 found. I suggest this plan, hoping that some assiduous ento- 

 mologist may be induced to follow it up, and decide this doubt- 

 ful and interesting question. 



The insect in the plate represented flying is the male, that 

 at rest the female, and the lines drawn near each denote then' 

 natural size. The plant figured with them is Juncus articulatus 

 Linn. (Shining-fruited jointed Rush): it is found by the water's 

 edge. / 



