178 Illinois State Lahoratonj of Natural Historij. 



in the latter part of summer, and that the young hatching 

 from their eggs hibernate in the mud. 

 From Harkness and Ballard Sloughs. 



6. Gomphiis notatus, Ramb., nymph. 



These young are like the two preceding in general appear- 

 ance, but lack the median tooth of the labium of number 4 and 

 the dorsal ridge of number 5. They differ from both of the 

 preceding in having only about three blunt teeth on the inner 

 edge of the labial palpi. The commonest Gomphus at Quincy. 

 Of various sizes, some apparently ready to yield adults. 



This is the Gomphus fiuvialis of Mr. Walsh. Of the adult 

 dragon fly, Mr. W. says that it flies constantly over water, and 

 he thinks feeds exclusively on aquatic insects. It does not, as 

 he supposed, breed exclusively in running water. Common. 



Localities : Willow Slough, Lily Lake, Broad Lake, Wood 

 Slough. 



7. Anax Junius^ Drury. 



The adult is one of our largest and commonest dragon 

 flies. Its general color is obscure green, with some blue and 

 black markings. Wings clear, vf'iih. a yellow wash. The 

 young are to be distinguished from all others taken at Quincy 

 by the characters given at the beginning of this group. The 

 very young are marked with wide transverse alternating bands 

 of black and white. 



Taken only in Long Lake, although the adults were seen 

 now and then about several of the sloughs. 



8. Epiceschna heros, (Fabr.) Hagen. 



Two small nymphs, the largest one about .72 inch long, 

 were taken in Wood Slough August G. They were found 

 clinging to dead sticks, depending apparently on their dark, 

 obscure colors for immunity from enemies. They agree in the 

 main with Mr. Cabot's description of the young of this species. 

 The antennge are of six articles, the distal one being longest. 

 The labium is cleft, but lacks the tooth at each side. There 

 are lateral si)ines on the abdominal segments 5-9, and most of 

 the segments have a median dorsal ridge terminating in a tooth 

 behind. 



