Catalogue of the Odonata of Ohio. 



203 



12. Argia violacea Hagen. 



Columbus, June 8 to September; Milan, July 10; Castalia, 

 July 11. Common. 



I have seen a half dozen, or more, females ovipositing at 

 one time in the algae and sediment on a half-submerged 

 boulder, each with a male clasping her prothorax, and stand- 

 ing straight up to avoid the possibility of contact with the 

 water. Both ludicrous and interesting. 



13. Argia tibialis Rambur. 



I have nowhere seen this Argia abundant. June 2, 1894, 

 three males and as many females were taken along the gorge 

 of the Licking River, near Black Hand. 



14. Argia apicalis Say. 



Taken in abundance at Milan, along the Huron River, 

 July 10. 



15. Argia sedula Hagen. 



Many males and three females captured at Sugar Grove, 

 September 4, 1894. They were most numerous in an aban- 

 doned lock of the Hocking Canal, through which a small 

 thread of water was flowing. It has heretofore been reported 

 from Virginia and Texas. 



The deep black and Prussian blue of the adult males make 

 a striking and beautiful form. The females, on the other 

 hand, are obscure ; their color is pale yellowish-olive, inclining 

 to brown on the abdomen; the mid-dorsal carnia is black, a 

 pale stripe each side, then darker to and including the humeral 

 suture ; the sides of the thorax are pale, the first lateral suture 

 black above, the second wholly so ; there is also a blackish 

 line near the posterior border of the mes- and the metepimera. 

 Wings slightly flavescent. 



Male abdomen 27 mm., hind wing 18 mm.; abdomen of the 

 female 25 mm., hind wing 20 mm. 



