88 DRAGONFLIES OF OHIO. 



although it has been taken as early as April 25. At 

 this early date the species was found in sunny places 

 along the border of woods. 



Didymops transversa, Say. 



Length: of abdomen tf 36-38 9 40; hind wing d" 

 33-35 9 37. 



Male; colors brown and yellowish. Head, front 

 livid with frons and nasus brownish, frons above with 

 an olive spot each side; rear of eyes yellowish, dark 

 near the occiput. Thorax brown, a transverse band 

 before base of the fore wings, mid-dorsal carina, a 

 narrow humeral and a prominent lateral stripe, white; 

 wings brownish at base, costa yellow, pterostigma and 

 veins fuscous ; legs, femora brown, tibiae yellowish 

 above, fuscous below, tarsi black. Abdomen brown, 

 all the segments more or less banded, a prominent 

 whitish band at base of 7, and a spot each side at base 

 of 8 ; 10 wholly whitish or yellowish. 



Superior appendages 2 millimeters in length, widest 

 at base, nearby straight, posterior third on the outer 

 side narrowed, apex acute; inferior appendage about 

 as long as superiors, edged with brown, conical, apex 

 blunt and furnished superiorly with a pair of 

 prominences. 



Female larger than the male and the brown mark- 

 ings between costa and third vein at the base of the 

 wings is noticeably longer. 



EPICORDULIA Selys. 



The two species of this genus are American. We 

 have only one of these in Ohio. This one is common 

 along all of our larger streams, canals, and lake shores 

 during July and August. 



Epicordulia princeps, Hagen. 



Length : of abdomen o 71 43 9 47 ; hind wing d" 41 9 

 45. 



