86 DRAGONKLIES OF OHIO. 



equal numbers, have been taken while flying over the 

 surface of the water. 



The following key will separate the species of the 

 genus: 



Expanse less than 100 millimeters, no antehumeral stripe 



\ illinoisensis 

 Expanse 110 millimeters or over, antehumeral stripe present 



tcEniolata 



Macromia taeniolata, Rambur. 



Length of abdomen cT 58 9 61, hind wing c? 52 9 58. 



Colors black, yellow and brown. Male ; head large, 

 front vertex black with two prominences above, frons 

 metallic green with yellow spots superiorly, rhinarium 

 fuscous ; labrum olive, dark at middle and inferior edge 

 A faceted tubercle on the posterior edge of eye. 

 Thorax fuscous with a distinct greenish reflection ; 

 yellow superioraly, part of antehumeral and a complete 

 lateral band present, yellow. The latter entirely en- 

 circles the thorax, passing between the insertions of 

 the two pairs of wings above and the second and third 

 pairs of limbs below. Legs and feet black, the hind 

 femora reaching the middle of the 2nd abdominal seg- 

 ment. Abdomen black, with superior' yellow markings 

 on segments 1-8. Superior appendages 3-5 milli- 

 meters in length, bent inwards at apical third, apex 

 turned outwards ; an emargination on the outer side 

 extends from the base to beyond the middle where it 

 terminates in a small tooth. Inferior appendage 

 nearly as long as the superiors, conical, curving up- 

 wards towards the apex. 



Female usually larger than the male, and in my 

 specimens the superior yellow markings on 8 of the 

 male are not present. 



Female usually larger than the male, and in my 

 specimens, the superior yellow markings on 8 of the 



