86 DRAGONFLIES 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 anteliumeral stripe 



illinoisensis 



Expanse 110 millimeters or over, anteliumeral stripe present 



txniolata 



Macromia taeniolata, Rambur. 



Length of abdomen cf 58 9 61. hind wing cT 52 ? 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 I'nd abdominal seg- 

 ment. Abdomen black, with superior yellow markings 

 on segments 1-8. Sufierior 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 3'ello\v markings on 8 of the 



