204 



ENTOMOLOGICAL NEWS 



[July, '22 



morning came clear and cloudless and we were at the Creek 

 before 4.30 a. m. At 4.45 a. m. the only female of charadraea 

 any of us ever saw was seen ovipositing, and two of us, suffer- 

 ing from Somatochlora fever, in turn missed fair strokes at her. 

 But that morning Somatochloras were very rare, and though the 

 lour of us collected diligently until after 10 a. m., a later 

 hour than we had found it possible to remain on other days, 

 we got a total of only three males and one female of lincaris 

 and two males of charadraea. Possibly the following record 

 of temperatures, and possibly the lower humidity of the morn- 

 ing of July 10, will explain the relative scarcity of individuals 

 on that date. As the minimum temperature each day was from 

 4 to 6 a. m., no other tabulation of early morning temperatures 

 is given. The temperatures are from a registering thermometer 

 at The Wells County Bank at Bluffton. Probably at Davis 

 Creek the minimums fell slightly lower, but the record is accur- 

 ate enough for our purpose. If temperature is not the cause 

 of the difference in the activity of these dragonflies, I can offer 

 no other suggestion. It is an unfortunate fact that after twenty 

 years I am still unable to predict a good day for Macromias 

 on the Wabash River. 



* Temperatuie, Fahrenheit scale. 



During our collecting trips, we had several opportunities 

 to observe females of linearis ovipositing. This always took 

 place in fine gravel and sand at or near the water's edge where 

 the water was very shallow, usually at a ripple. The females 



