Catalogue of the Odonata of Ohio. 



199 



America?ia, it seems, is peculiarly restricted in its range of 

 flight. I have never observed one so far as a few rods away 

 from their accustomed habitat — the water's edge. Another 

 notable habit is that of congregating, sometimes in compa- 

 nies of hundreds. These assemblies commence in the after- 

 noon, and do not disperse until the warmth of the following 

 day awakens them to activity. Both sexes assemble, and 

 they rest so compactly that I have captured seventy-five by 

 one sweep of the net. The slender, drooping twigs of the 

 willow, loaded with these beautiful insects, like a string of 

 gems, present a beautiful picture. 



I can not think that the female of this Hetcerina " flirts 

 her eggs into the open river, without attaching them to 

 aquatic plants." * It is not unusual to capture those having 

 the last few joints covered with mud precisely as is often 

 the case with endophytic species. In a few instances I have 

 seen the female, unattended by the male, resting on a half- 

 submerged log, or algal-laden rock, or water-weed, and 

 thrusting the abdomen beneath the water, place her eggs, 

 one by one, in the soft substance. 



" The small but distinct tubercle above on the posterior 

 base of the median lameliform tooth of the appendages " is 

 really double, and the truncated tips of the inferior append- 

 ages have tico robust acute teeth directed inward at the 

 median angle of the truncation, instead of one, as has been 

 stated. Again, the pterostigma of the female and teneral 

 male is yellow, but that of the adult male is brown or black. 



I think we may reasonably expect to find within our lim- 

 its, most likely along the Ohio River, H. tricolor Burm., H. 

 sclerata Walsh, and H. limbata Selys. 



(2) Agrioxin.-e. 



4. Lestes uxguiculata Hagen. 



Taken abundantly at Sandusky, July 3-13, 1894; Milan, 

 July 10; Castalia, Jul}' 11; Toledo, August 1. Not uncom- 

 mon from June to September at Columbus. 



• Walsh. Proc. Ent. Soc, Phil. II, 232. 



