Cincinnati Society of Natural History. 



numbers. Along a small creek, June 25, 1899, I counted 

 thirteen species of the Agrio?iin<z , and they were in such 

 swarms that they presented a remarkable sight. 



The following is a list of the species collected in this vicin- 

 ity, with notes on some of them. My thanks are due Pro- 

 fessor Hine, of Columbus, for assistance in their identifica- 

 tion : 



Calopteryx maculata Beauvois. 

 Het<zrina americana Fabricius. 

 Hetcerina tricolor Burmeister. 

 Lestes unguiculata Hagen. 

 Lestes disjimcta Selys. 

 Lestes rectangularis Say. 

 Lestes incequalis Walsh. 

 Argia putrida Hagen. 

 Argia violacea Hagen. 

 Argia apicalis Say. 

 Argia sedula Hagen. 

 Nehalennia posita Hagen. 

 Amphiagrion saucium Burmeister. 



Enallagma traviatum Selys. June 9th to July 8th, at lakes 

 in Spring Grove, this species flies, by hundreds, a few inches 

 above the water and generally in couple, stopping at intervals 

 on a leaf of some pond plant to oviposit. On June 20, I saw 

 a female submerged about four inches, clinging to the stem 

 of a Sagittaria, ovipositing. They fly most abundantly in 

 the morning ; in the afternoon they take shelter in the bushes, 

 and are much less active. 



Enallagma civile Hagen. Very abundant, June to Septem- 

 ber. On July 29, 1897, I saw a pair of this species oviposit- 

 ing on a submerged twig. The female was entirely under 

 water, and the male, clasping her neck with the tip of his 

 abdomen, was standing upright, with swiftly moving wings, 

 trying to retain his hold and yet not be drawn under water. 



Enallagma carunculatum Morse. Taken here, July 19, 1895, 

 by Professor Kellicott. I have not seen it since. 



Enallag7na geminatum Kellicott. 

 Enallagma cxsulans Hagen. 



2 



