98 DRAGONFLIES OF OHIO. 



Male, colors yellow and brown, wholly blue pruin- 

 ose in old specimens. Front, mid-dorsal stripe and 

 lateral spots on thorax, and abdomen each side, yellow- 

 ish. In old specimens these markings are all obscured. 

 Wings yellowish along the front margin, at base the 

 space between subcostal and median veins black. 

 Pterostigma bicolored, inner half sulphur yellow, outer 

 half black. 



The female has the wings decidedly black at apex, 

 and in old specimens the yellow is encroached upon by 

 brown. 



The species so far has been taken in only one local- 

 ity in the state. Here it has been observed two years 

 in succession and no less than a dozen specimens taken, 

 so we have no doubt that it is a permanent resident in 

 Ohio. 



Mr. J. B. Parker secured specimens at Danville in 

 June 1897 and '98. 



Libellula vibrans, Fabricius. 



Length : of abdomen o 71 40, 9 38 ; hind wing <3 46, 

 9 48. 



Male, colors brown and yellowish, old specimens 

 pruinose. Front olive, labrum and labium yellow, the 

 latter black at middle, margins of mouth and mandi- 

 bles black. Thorax yellow on the sides marked with 

 black below, prothorax more or less black. Mid-dorsal 

 stripe on thorax yellow. All these markings may 

 become obsolete in old specimens. Abdomen yellow on 

 the sides at first, but later no markings can be seen. 

 Wings transparent, space between subcostal and 

 median veins at base, a small spot at nodus, and ex- 

 treme apex black. 



The female has more black at apex of wings. This 

 is the largest species of the genus in our fauna, the 

 small nodal spots in connection with the basal space 



