790 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Diplax rubicundula Say. 



Qaite common in the suburbs of Kansas City, and at many points 

 along the railroad leading through Kansas to Denver. 



Mesothemis corrupta Hagen. 



Moderately common near pools and streams on the plains in and be- 

 yond Denver, August 5 and 8. It seemed to hav e disappeared by the 

 18th of the month, as I then failed to see it i n the same or similar 

 localities. 



MesotJiemis longipennis Burm. 



Observed in many places in Kansas, and one specimen seen in the 

 valley of the Arkansas, near Pueblo. 



Libellula pulchella Drury. 



One specimen observed in the suburbs of Denver, August 5. It kept 

 out of the reach of my net, and I was unable to secure it, although it 

 flew sometimes within three or four feet of the i)oint where I stood. 



Libellula luctuosa Burm. 



This species was very common all along the railroad through Kansas; 

 but no specimens were to be seen at a distance from the streams and 

 pools of water on the plains of Colorado. 



Libellula forensis Hagen. 



One specimen of this fine insect was met with on the road leading 

 from Denver to Golden, and at a distance of about six miles from the 

 former city. I obtained a full view of it, but could not get near enough 

 to capture it. 



Cordulia sp. 



One, if not more, of the brilliant green species of CorduUna was seen 

 in localities near the South Platte Eiver ; but none were in places where 

 I could capture them. A similar insect was seen near buffalo-pools at 

 several of the stopping-places along the line of the Kansas Pacific Rail- 

 road, within the limits of Colorado. 



JEsclma constricta Say. 



Observed in many places in Kansas and Colorado, along the line of 

 the Kansas Pacific Railroad, generally flying over pools of water. In 

 Clear Creek Cafion, it was seen at intervals of every few rods flying over 

 the creek or lodging on the rocks of the open spaces and around the 

 openings of the gulches, August 6. 



^schna sp. 



A larger species than the preceding was flying about near the mouth 

 of Clear Creek Caiion, but it was beyond the reach of my net. 



Anax Junius Drury. 



Very common along the Kansas Pacific Railroad, through Kansas and 

 into Colorado. It was always seen on the wing, flying over the railroad 

 ditches or pools. 



