LIBELLULID^E. 



603 



rig. 580. 



basal space has no transverse veins, and the male appendages 

 are forcipate. (Hagen.) Calopteryx apicalis Burin, is shining- 

 brassy green, with long black feet. 



In Lestes there are two antecubital transverse venules ; the 

 fourth apical sector is broken ; the postcostal space is simple ; 

 and the quadrangular space is trapezoidal, 

 with the exterior inferior angle acute ; 

 the pterostigma is large, oblong, and the 

 appendages in the male are forcipated. 

 Lestes eurina Say is blue, varied with 

 green and violet. The beautiful genus 

 Agrion has the apical sector straight, the 

 postcostal space simple, the quadrangular 

 space trapezoidal, with the exterior inferior angle acute ; the 

 pterostigma small, rhomboidal, while the male abdominal ap- 

 pendages are short. Agrion civile Hageu is brassy-black, 

 varied with blue or green, with a hairy head and thorax. A. 

 saucium Burm. (Fig. 586) is red, variegated with black, and is 

 a common species. 



In the group ^Eschnina the wings are unequal, and all the 

 triangles of the wing are of the same form. In GompJms and 

 its allies - the 

 wings are un- 

 equal, the 

 hinder ones be- 

 ing broader, 

 and the trian- 

 gles of both 

 pairs of wings 

 have no trans- 

 verse veins. 

 Gomphus fra- 

 ternus Say is 

 yellow spotted Fi - 587 - 



with black, with black feet. The genus Anax differs in the 

 anal angle of the posterior wings being rounded in the male, 

 and the abdomen has a lateral interrupted ridge. Anax Jt/nitis 

 Drury is a large and widely spread species ; it is green, spot- 

 ted with blue and fuscous, with a yellow head. ^Eschna differs 



