Catalogue of the Odonata of Ohio. 



109 



82. TETRAGONEURIA SEMIAQUEA Burm. 



One male was taken near Columbus, in May, by A. H. Dunham. 

 Several individuals were seen by the writer at Greenwood Lake, 

 Delaware, May 25, 1895. 



(7.) LIBELLULID^E. 



83. — PANTALA HYMEN^A Say. 



One male taken while flying about a receding puddle in a gravel- 

 pit, Cincinnati, July 18, 1895. 



84. — LIBELLULA AXILLENA West. form. VIBRANS Fab. 



Columbus, June 8; Licking Reservoir, June 14, 1895. It 

 appears to spend less time on the wing than any other species of 

 Libellula in our list. 



85. — diplax corrupta Hagen. 



Two males and two females were taken at Ross Lake, Cincinnati, 

 July 19; one male at Port Clinton, August 15, 1895. It tnus appears 

 to occur throughout the "maritime" parts of Ohio and in one 

 locality at least it is not rare. 



86. — diplax madida Hagen (?) 



Three males were taken on the shore of Lake Erie, at 'Port 

 Clinton, August 15, 1895. 



This species appears to be more at home "out at sea" than any 

 other one of its genus that I have observed. The males were found 

 sporting about and over wide shallow pools of the sandy beach ; the 

 females were seen several times to fly from repose far out over the 

 waves, touching a crest now and then and finally returning ; unfortu- 

 nately none were captured. 



While the species agrees in many ways with Dr. Hagen's descrip- 

 tion in "Psyche" V, 385, there are also disagreements, as 1 under- 

 stand his diagnosis, so I have grave doubts as to the correctness of 

 the reference. The size is that of madida ; the wings are not flavescent 

 at base and on the costa; they are hyaline throughout, at least in my 

 specimens which are old; but the veins are reddish brown: the 

 hamuli are not yellow but dark brown ; in form, on the other hand, 

 they appear to agree, the thick, ovate outer lobe bears a stout hook on 



