60 DRAGONFLIES OF OHIO. 



band each side not quite reaching the anterior border of 

 mesothorax, a broad black antehumeral separated ex- 

 cept at one point above from the narrower humeral by a 

 yellow line ; sides yellow with second lateral suture 

 black and a band below reaching the mesothorac stigma 

 a little above ; wings with the costa green ; pterostigma 

 brown, covering three or three and a half cells ; legs 

 and feet black. The abdomen with well marked dorsal 

 yellow band on 1-8, a broad space on 1. three lobed on 

 2, narrow, extending nearly the whole length of 3-6, on 

 7 half as long as ring, on 8 small triangle ; the sides of 

 1-2 yellow, on the lateral expansions of 8 a large bright 

 yellow spot separated from an apical one by irregular 

 brown shade, and all of the sides of 9. 



The appendages are blackish, longer than 10, from 

 above divaricate, base broad, tapering, apex acuminate, 

 in profile arched, apex obliquely truncated upward ; in- 

 feriors more spreading, reaching beyond the lower 

 angle of the truncation which is slightly prolonged, 

 apex turned upward, obtuse. 



The female differs in having the occiput concave 

 with an obtuse process in the middle, the humeral and 

 ante-humeral connected for a wider space, a yellow 

 stripe on outer side of first femur and sometimes on 

 third ; the abdomen is stouter, and the expansion of 

 the apex not so broad. The appendages black and 

 pointed ; the lamina reaches the middle of 9, bifid in 

 apical third, branches turned outwards at apex. 



Fraternus is common in most parts, in May, June, 

 and first days of July ; it is only found by the shore of 

 the great water or by considerable streams, then about 

 the most rapid reaches. The females oviposit by wash- 

 ing the eggs into the rapids or the breaking waves. 



Gomphus externus, Selys. 



Leng*h : of abdomen, cf 40, ? 40 ; of hind wing cf 

 34, ? 35. * 



