Maclaren 1968 C. melanocephalus 22 June) close together, with little interaction. Collected whar looked like a ♂ (SU 906), but is probably a first-year ♂ with little throat development. In the evening drove out to II-III, then I-II on Gasoline Ridge. In both places it was the same: many birds perching on flooded flats (East of II-III, No. of Gasoline) - I could have collected 3-5w perching observations until my pencil wore down. These birds showed only occasional interaction. Additionally, at each site a smaller number of ♂s were off on slightly more elevated land suitable for nesting involved in active chasing and display. These appear to be setting up territories. In both cases these birds appeared bolder; in no case was a small first-year bird involved in this activity. I collected one of these territorially inclined birds near Gasoline - SU 907. This is the heaviest bird collected to date - 106.9 g. Also collected 2 birds from flocks for comparison - SU 908, 9, [illegible] these were also over 100 g. 23 June the situation is about the same - many birds at the same places - some acting as if territorially inclined. Shot a territorial ♂ that displayed over a ♀ - I think this - by the west end of line X. this bird - SU 910 - was the lightest taken to date: 107.7 g. Also took 2 more from a flock - SU 911, 912: much lighter.