Vol. XXX ] ENTOMOI, dCIC \l, \K\VS. IO5 



very faint, extreme tip apparently with a small sensorium. Beak 

 reaching somewhat beyond the posterior legs, eight-segmented. Ab- 

 dominal spiracles apparently lacking. 



Hosts. From Populus trichocarpa and Sali.v sp., S?.n Fran- 

 cisquito Creek, near Stanford University, California, and from 

 Populus candicans, Salt Lake City, Utah, (R. W. Doane, coll.). 



Notes. I am inclined to regard it as somewhat doubtful that 

 this is really P. salicola Perg. The original description lacks 

 definiteness in regard to the most important details and the 

 figure is somewhat impressionistic but it is obvious that the 

 species at hand is at least close to salicola. It certainly is not 

 P. popiilaria Pergande as the latter is described and figured 

 as having the dorsum thickly beset with minute points. The 

 description and figures here presented, will, it is hoped, aid 

 in clearing the matter up. 



I am entirely unable to separate the specimens found on 

 poplar from those found on willow, the only visible difference 

 being that the abdominal groups of pores are perhaps a trifle 

 larger in the specimens from the latter host. In the specimens 

 from poplar in Utah, this difference is quite noticeable, the 

 number of pores in all the groups being much reduced, some 

 of those toward the posterior end of the abdomen bemg en- 

 tirely lacking. 



It may be noted that the above descriptions are based upon 

 carefullv stained material. 



The Naiad of the Odonate Genus Coryphaeschna. 



By CLARENCE HAMILTON KENNEDY, North Carolina State 



College, West Raleigh. Xorth Carolina. 



Recently while examining Mr. Rrimley's collection of in- 

 teresting southern Odonata the writer was shown among other 

 immature specimens the largest aeshnine naiad* he had ever 

 seen a regular behemoth of a naiad. Mr. Rrimley believed 



*See Comstock. Ann. Ent. Soc. Amer., iqi8, vol. XI, pp. 222-224. 

 I have adopted Prof. Comstock's term for the imnuture state of the 

 Odonata. It is a most happy term for distinguishing the immature 

 stages of the aquatic orders. 



