198 



Cincinnati Society of Natural History. 



it at Columbus as early as May 15, and at Sugar Grove as late 

 as September 4. Milan, July 10; Oberlin (Lynds Jones); 

 Mansfield (K. Wilkinson). 



In this species, at least, the male does not seize the female 

 with his feet previous to clasping her prothorax with the 

 abdominal appendages. He flits about her, when at rest, 

 gradually approaching, and, finally, the female not attempting 

 to avoid him, he poises himself with sufficient accuracy to 

 pick her up by the prothorax, when they fly away "in 

 couple." 



2. Calopteryx .equabilis Say. 



^quabilis is apparently a rare insect throughout a greater 

 part of the State. Dr. Paul Fischer has taken it at Colum- 

 bus and I have taken it at Sugar Grove, in June. There 

 are no noticeable differences between these Central Ohio spec- 

 imens and those from Michigan, where I have taken it spar- 

 ingly. The males agree well with Dr. Hagen's description in 

 Psyche V, 246. The single female in the University collection 

 differs by not having a median dorsal abdominal band except 

 on 8, 9, and 10, and by having the " second joint of the an- 

 tennae yellow externally " only on the basal half. The ptero- 

 stigma is not reticulated, longer and narrower than in Macu- 

 lata. 



C. AUGUSTiPENNis Selys, and C. dimidiata Burm. are 

 attributed to Kentucky by Dr. Hagen, and may reasonably 

 be expected to occur on this side of the Ohio River. 



3. HET^RINA AMERICANA Fabr. 



A common form in the central parts, probably distributed 

 throughout ; at Columbus, Central College, and Sugar Grove, it 

 is abundant along rivers and smaller streams, especially w T here 

 grasses and shrubs overhang the water rippling over bars of 

 pebbles and among boulders. I have not seen adults until 

 the middle of July, but they are often numerous until the 

 middle of October, and may ordinarily be found as late as the 

 beginning of that month. 



