Illinoi 949 Euliea americana -46- June 23 Jewel Lake, Tilden Park, Contra Costa Co., Calif. At 7:30 p.m. the sun had set and only one adult of the N family and both adults a young of the south pair were seen - by 7:45 the N ad had disappeared into the cat-tails at L21. A few moments later the S birds were also out of sight. June 24 same locality - As soon as I chased them into the cat-tails this morning about 10:30, activity seemed to cease - occasionally one would be seen, but seldom for more than a moment - I had the boat off to water at 3 p.m. but it was not until 3:30 that activity started - at that time one bird crowed, and a moment later came splattering over the water from C15 to B18 - where he immediately attacked a young there, in quick succession three of the north brood were driven out to about C20. In the middle of this battle the N & "pukked" from somewhere over near the island and a moment later was seen charging across the lake. The young "peeped" excitedly as he passed and he killed two of them but without slowing his pace, he continued on to about B19.16 where he drew up, matching in paired display the antics of the other bird at B19.1. This display desated less than a minute before they broke it off and separated without