24 DRAGONFLIES OF OHIO. 



with black as follows : antennae, lines about the vertex 

 and frqns, lines on the sides and .edges of prothorax 

 humeral and second lateral sutures and dorsum of the 

 abdomen. The blue of the sides extend as basal rings 

 on 3-7 ; ten is blue. The appendages are pale, short 

 and blunt ; the valves short, pale smoky below, 

 serrated. 



Putrida occures throughout the State, in vast 

 numbers along Lake Erie and about the islands; it 

 often comes on ship-board far from land. It flies from 

 May to October. The female, usually attended by the 

 male, oviDosits on submerged timbers and moss, and 

 alga-ladened stones. It is not uncommon, to see the 

 female and her consort descend beneath the water and 

 to remain submerged for what would appear to be a 

 long time. 



The following observations were made one day on 

 its habit of ovipositing under water. Five pairs were 

 noted on a timber of a dock ; they were from barely 

 covered to six inches under water ; the following notes 

 were made at the time. 



Pair 1. c? abandoned 9, emerged and flew away 

 after five minutes, cT remained one hour. 



Patr 2. c? abandoned 9 in seven minutes, cT re- 

 mained fifty-five minutes ; after exposure to the air for 

 a short time she returned beneath the water for fifteen 

 minutes. 



Pair 3. cT remained submerged twenty minutes, 9 

 thirty ; she flashed her wings and immediately re- 

 turned for twenty-five minutes. 



Pair 4. They were disturbed, emerged and flew 

 away together. 



Pair 5. They were seen to alight on the dock just 

 above the water and slowly back down until they were 

 covered. 



