KELL1COTT. 27 



The female is light brown until fully adult, then 

 as blue as the male. Her markings differ slightly: the 

 inferior humeral is small or wanting, there is more 

 black on the abdomen, the legs are paler, and the 

 pterostigma lighter. 



The superior appendages of the male are short; in 

 profile they are narrow, end rounded, within there are 

 two long teeth, the inner longer, obtuse, the outer 

 acute* they are turned downward and outward 

 toward the inferiors. The inferiors are much longer 

 and stouter, equally bifid, the lower branch conical, 

 the upper stouter, more pointed. 



The female appendages are light in color, of the 

 usual form. The species is not uncommon on the 

 rocks along the larger streams. In no other of our 

 spepies are the sexes so nearly similar. 



Argia sedula, Hagen. 



Length : of abdomen c? 26, ? 26 ; of the hind wing 

 o* 18, 9 20. 



The male is black, marked with deep blue. The 

 frons, clypeus,labrum, postocular spots, the sides of the 

 prothorax and a spot each side of its dorsum, ante- 

 humeral stripes, the sides of the thorax (divided by a 

 black line on second suture) stripes on femora and 

 tibiae ( pale like sides of thorax ) the sides and apex of 

 the first abdominal ring, the sides, two basal dorsal 

 spots on two, basal rings on 1-7, the whole of 8-10 

 and sides of 3-7. The wings are slightly fumose, 

 pterostigma light brown. 



The female is clay colored and light olive, differing 

 totally in appearance from the male ; her wings are a 

 little more fumescent and the stigma lighter. 



The superior male appendages are longer than 

 those of the preceding species, and are somewhat 

 curved within, the ends are rounded with a pointed 

 tooth on the lower inner angle and another on the 



