10 DRAGONFLIES OF OHIO. 



The male is metallic green ; the following black ; the 

 head except the clypeus, thoracic carina, a narrow 

 humeral stripe, more or less on thoracic sutures, the 

 legs and the abdominal appendages. The wings are 

 hyaline, except the tips, with a shade of brown which 

 is golden at certain angles, the tips are deep brown to 

 black, as follows: the anterior with one fourth or one 

 third black, irregular on inner border, the posterior 

 with one third or one half straight within. 



The superior abdominal appendages are forcipate, 

 on the inner surface there is a sinus at the middle 

 followed by a stout tooth, the apical portion is thick, 

 apex obtuse, outer margin denticulate; the inferiors are 

 shorter, stout, and straight seen from above, strongly 

 curved upwards, the apex with an incurved apical 

 hook ; the surface of these organs is rou^h and in opti- 

 cal section appears serrate. 



The female agrees closely in color with the male, the 

 tip of abdomen becoming brownish with a light band 

 on 8-10; and on sides of 5-10; there are light lines 

 above the thoracic feet. The abdominal appendages are 

 shorter than 10, stout, acute. The wings are lighter 

 apically than in the male; the pterostigma is narrow, 

 not reticulated, milk white. 



Compared with maculata, aequabilis is a little 

 larger, but more slender; the body is more decidedly 

 metallic green; the male appendages are similar, but 

 differ sufficiently, they are rougher, that is, the denticles 

 are more numerous and stouter, the strong tooth on 

 the inner curve is wanting in maculata, the inferior are 

 straighter, stouter and rougher than in maculata. The 

 wings besides their difference in color are not quite so 

 spatulate; the pterostigma is very different. 



JEquabilis has been taken thus far only in the cen- 

 tral part of the state in the first of summer. Its habits 

 appear to be similar to those of maculata except it has 



