170 



A NATURALIST IN THE GREAT LAKES REGION 



FIG. 178 FIG. 179 



FIGS. 178, 179: Fig. 178. Jaws 

 of nymph of Lestes forcipatus, after 

 Needham; Fig. 179. Nymph of 

 dragon fly, Celethemis eponina. 



have very prominent eyes, a very large labium, and the abdomen 



is scarcely narrowed at all until the ninth segment. There is a 



black band between the eyes and a black band encircling each 

 femur. The adult Lestes is rather dull colored, 

 and when it rests, the wings are held as a rule 

 spread horizontally rather than folded over the 

 back, as other damsel flies hold 

 theirs. The full-grown dragon fly 

 of Tramea lacerta has a wing- 

 spread of nearly 4 inches. The 

 body is dark, almost black. The 

 upper surface of the abdomen 

 bears white or greenish spots. It 

 flies from June to September. 

 C. eponina (Fig. 180) has a wing- 

 spread of about 3 inches. The 



thorax is red-brown with black stripes. The abdomen is black 



with yellow spots. The triangle is covered with a spot, and 



there are two bands, 



sometimes reduced to 



spots, on each wing. 



It also flies from June 



to September. 



Lampsilis luteola 



(Fig. 181) has a 



smooth shell with 



distinct narrow green 



,rays. It is about 



twice as long as high. 



It is good sized, 



usually 3-5 inches long and quite thick. The muscle scars and 



cardinal teeth are plain on the inside of the shell. 



Alasmodonta marginata (Fig. 182) is rayed with broad green 



radiating lines. In outline it is quadrate, the posterior region 



being truncate. The umbones are marked by three distinct 



FIG.' 180. Adult dragon fly, Celethemis eponina. 

 After Needham. 



