26 DRAGONFLIES OF OHIO. 



Argia tibialis, Rambur. 



Length: of abdomen d 27. 9 27; of the hind wing 

 c?21, 9 22. 



Color bronze black variegated with lilac or blue as 

 follows: frons, clypeus, lips, broad stripe each side of 

 thoracic dorsum ; sides of thorax with second lateral 

 suture black, more or less of sides of 1-7 more in female, 

 with basal yellow rings on 3-7 in both sexes, the 

 dorsum of 9 and 10 in the male. The legs have more 

 or less of pale, pterostigma dark brown. 



The male has 10 incised as in the preceding species, 

 although not so deeply and the sides of the incisions 

 are more nearly vertical. The appendages are short; 

 the superior at first cylindrical then apically divided 

 by a deep groove extending obliquely across it, the 

 upper branch is wide, apex rounded, in profile some- 

 what wedge shaped, the lower is pointed and recurved 

 downward and inward. The inferiors are stouter, 

 longer, bifid, the upper stouter branch is pointed, the 

 point reaching the grove in the superiors, the lower is 

 smaller situated on the inner side of the former and 

 points downward. 



The appendages of the female are very short and 

 blunt, the valves short and broad, dark in color. 



This species is not common but has a wide range. 



Argia apicalis, Say. 



Length: of abdomen cT 31, 9 30; of hind wing <S 

 23, 9 25. 



The male is pale blue with black marks as follows: 

 Antennas, vertex, prothorax except a blue spot each 

 side, inferior humeral, mid dorsal carina, dorsum of 1-6 

 (;the same extends on 3-6 as an apical ring) and the 

 whole of 7. There are basal light rings on 3-7 and an 

 imperfect mid-dorsal on 1-6 



