8 DRAGONFLIES OF OHIO. 



have been taken in Kentucky and doubtless will yet be 

 found on this side of the great river. 



The species of the genus are arranged in two 

 groups, thus : 



1. Wings spatulate, /. e. anterior and posterior margins of the wings 

 not parallel. 



(1.) Wings uniformly velvety black, ( brownish in young). 



maculata. 

 (2.) Wings hyaline basally, apical third or fourth blackish. 



eequabalis. 



2. Wings not spatulate, i. e., anterior and posterior margins nearly 

 parallel.* 



*No representatives as yet recorded from the State. 



1. Calopteryx maculata, Beauvois. 



Length: of hind wing, c? 28 mm., 9 30; of abdo- 

 men c? and 9 37 mm. 



The males are metallic blue or green ; the antennae, 

 under parts of head and thorax, legs, a broad humeral 

 stripe, the thoracic sutures and under parts of the 

 abdominal segments 1-7 are black ; segments 8-10 and 

 inferior appendages below are light — sometimes the 

 black extends to 10 or even to the appendages. The 

 wings are velvety black in the adult, some shade of 

 brown in the young. 



The superior appendages are forcipate, at base 

 nearly cylindrical, narrowing to the middle at 

 which they suddenly expand interiorly to the some- 

 what swollen and slightly decurved apex ; the distal 

 half bears several stout denticles on its outer margin. 

 The inferior appendages are shorter, truncate, some- 

 what curved inward and upward, with a sharp in- 

 curved tooth at inner angle. 



The females have the head and thorax similar to 

 the males, but with more blackish shades and the ab- 

 domen brassy brown with a pale light or white 

 dorsal band on 8-10, broader on 9 and often including 

 a part of 7. Abdominal appendages nearly as long as 

 10, slender, pointed and black. The wings are similar 



