196 PROCEEDINGS OF THE NATIONAL MtJSEUM. 



24. LIBELLULA PULCHELLA Drury. 



This large and well marked species was seen but very few times 

 during the season, once on the Big South Fork near Burnside, July 11, 

 a second time near the small pond at Indian Creek Landing, July 17, 

 a third time near Gainesboro Landing, and finally near HartsviUe, 

 August 15. It seems remarkable that a species so cosmopolitan as 

 this should be so httle in evidence for the whole length of the river. 



25. PLATHEMIS LYDIA (Drury). 



This species was found everywhere, not on the river but up the 

 tributary creeks and around the little pools and ponds in the pastures 

 and fields. The first one was taken at Jellico, Tennessee, June 28, and 

 the last one at Clarksville, Tennessee, August 30. Specimens could 

 have been secured at every stopping place in Kentucky and Tennessee, 

 but the males are so easily distinguished while fl3^ng as to obviate 

 the necessity of their capture. 'It is seen only rarely on the river 

 banks. 



26. AGRION MACULATUM Beauvois. 



Common along aU the smaller shaded creeks running into the 

 Cumberland, but never appearing on the main river. Among the 

 localities from which specimens were obtained are Wilhamsburg, 

 Kentucky, June 29; Big South Fork, Beaver and Greasy Creeks, 

 Cloyd's Landing, Roaring River, Carthage, Hartsville, and Ashland 

 City, Tennessee, August 27. Probably every creek and run between 

 these geographic and time extremes would have yielded specimens. 

 A great difference was noted in the ease with which this species 

 could be approached at the different localities. At Wilhamsburg and 

 on Beaver Creek and at HartsviUe one could walk up and seize them 

 with his fingers. At Roaring River and Ashland City it was almost 

 impossible to get near enough to catch them with the net. 



27. HET^RINA AMERICANA (Fabricius). 



This species was common everywhere along the upper portion of 

 the river in the viciaity of swiftly running water. It is especially 

 fond of shallow rocky ripples, either in the main river or in any of 

 its tributary streams. Some were captured at practically every one 

 of the ripples visited, but the numbers diminished in descenduig the 

 river, until at the State line there were comparatively few. The 

 last one seen was secured at Rome in Smith County, Tennessee. As 

 americana dimiaished and finally disappeared the following species, 

 H. tricolor, appeared, increased in numbers, and finally took the place 

 of americana. 



Both of these species fly until October, so that this difference in 

 their distribution can not be attributed to seasonal changes, but 

 must be geographical. 



H. americana is a species whose range extends to the north and so 

 frequents the upper portions of the Cumberland River among the 

 mountains. 



