189 [Scudder. 



? Agrion (Ischnura) cceciim Hagen. 



Some of my specimens seem to agree pretty well with Hagen's 

 description of this species, but yet differ so much that I deem it best 

 to describe them throughout. 



The colors of the ? in life were not noted by me ; those of the $ 

 were a bronze-green with metallic reflections, and a deep bluish pur- 

 ple ; in the teneral stage the green was dull, and the purple very pale; 

 in the following description 1 give the colors as they now appear. 



Head black, the front brownish-black, labrum dark testaceous 

 (adult $), or luteous with a vertical transverse band of bronze-green 

 extending forward to the base of the antennge, and in the middle of 

 which the ocelli are situated (teneral) ; antennse blackish-brown, basal 

 joint reddish-brown (adult 3), or luteous (teneral), joints two and 

 three tipped with reddish-brown ((5) or two luteous, three fuscous, 

 basal half luteous (teneral ? ) ; dorsum of prothorax bronze-green, 

 sides bluish purple (adult 5), or sides pale purplish (teneral (5), or 

 pale testaceous (teneral?); posterior edge uniformly raised (5), or 

 entire and simple (?) ; thorax deep bluish purple (adult (5), or pale 

 purplish-brown (teneral 6), or pale testaceous (teneral ?), with a 

 broad straight median dorsal stripe, a broad straight humeral stripe, 

 largely clubbed at the apex, and a narrow metathoracic, sometimes 

 abbreviated, stripe, bronze-green, the humeral stripe in teneral ? only 

 dark testaceous ; wings hyahne ; pterostigma small, rhomboidal, ros}'- 

 brown (adult 5 ) or pale (teneral) ; legs blackish-fuscous with black 

 spines, those of tibise very long, the coxa?, the femora at base, their 

 posterior and inferior surfaces, and tibise except anterior surface, red- 

 dish-brown, claws reddish, black-tipped (adult $), or pale, the 

 anterior edge of superior surface of femora and tibiae and a basal 

 annulus on the tarsi blackish-fuscous (teneral) ; abdominal segments 

 1-3 bright blue, the base of 1, sides of 2 and a dorsal transverse band 

 just beyond the middle of the segment, its posterior edge excised, 

 apical fourth of 3 bronze-green, 4-7 and 10 bronze-green, 8-9 bright 

 blue (3 , in the teneral ? the blue is faint), or, bronze greenish-brown, 

 deepest on segments 1-2, 7-9, the sides wholly, and on segments 3-7 a 

 basal annulus pale testaceous (teneral ? , of which the terminal seg- 

 ment is destroyed) ; posterior edge of 10 in 6 strongly excised; supe- 

 rior appendages of $ black, forcipated, as long as the side of the 

 terminal segment, sub-incurved, interiorly subunguiculated at tip, a 

 tooth which is sometimes indistinctly bifid on the interior' edge at one- 

 third the distance from the tip, basal half suddenly produced at the 

 inferior inner angle to a broad rounded testaceous lamina ; inferior 

 appendages luteous, very short, broad, the outer upper angle furnished 

 with a sharp, subincurved and sharply upturned, black-tipped unguic- 



