Christman, E., Jr. 1960 Agelaius tricolor 3 mi. E., 50' elv., 22 Oct. Nacrell Ranch, 10 mi. S. Mayville, Yuba Co., Calif. On a duck hunt with ASL at 3 p.m. went into colony on N. side of marsh 75 ft. E. of N. end of #2 fence. Penetrated 40 ft in an ash. Five newly built nests were found. Six other nests were found & contained 4 nests with 3 eggs each and two with 4 eggs. All were opened & all contained eggs with an evident blastodisc, had no further development. Then I entered the area at #1 where I first found Tricolor nests on 2 Oct., & entered along old path thru cattails then made a perpendicular entrance into an area not previously examined. Three fresh nests (newly built) were found. One nest with one egg. One nest with two eggs. 4 nests three eggs and one nest with four eggs. All eggs was opened. Of all the clutches examined all eggs were at the blastodisc stage except two. Set of these eggs & a set of 4 eggs contained embryos. The embryos were about 5mm long, with eyes pigmented about 1/2. Unfortunately, these clutches were broken while drawing and of the cattails & were destroyed. Upon entered a colony since the birds fly swiftly over head in a tight mass, then about 20 yds away on the tops of the cattails. This morning another # was seen carrying nesting material. Again, masses of feeding birds fly to and from the marsh in all direct. No birds were collected this trip. Fresh nests are readily distinguished from the spring nests. The latter are collapsed, loose & covered with sandfeet.