(25) approached for food, then to the nest. Green-eyes' eyebrows lighter Green-eyes has slightly more distinct and lighter colored "eye- brows." Brown-eyes looks somewhat larger, is tamer, more active and seems to take the initiative in various bird enterprises. They appeared to loaf all of the afternoon, except that when they were given food, they went back to shaping the inside of the nest. Mar. 2nd. They were not working at 9 A.M.--loafing outside the south fence. They tried to come through the wire fence at the top of the slope, but the honeysuckle was too thick and they climbed over to me. For the first time, Green-eyes was seen to offer his mate a meal-worm, instead of its being the other way around. They then remembered that they had a nest and spent a little time shaping it. I suspect that Brown-eyes is really the male. (It is) About sunset they seemed to be looking for a place to roost. They wandered about quite a bit, showing little interest in me and more in each other than I have previously observed. They indulged in various capers about each other, both singing typical thrasher sup- pressed song and finally copulated. (First time noted). It was too dark under the trees to distinguish between them at a distance of 20 or 30 feet. March 3rd. Mr. Sampson and I went to see Dr. Grinnell and check the rough sketch which I made yesterday, of Brown Eyes, with the skins at the Museum of Vertebrate Zoology; for in all of the descriptions of thrash- ers which either of us recalls reading, detailed descriptions of the head and throat markings are lacking (and these are very distinct on two birds) and there appear to be no references to distinguishing marks of the sexes. Considering the roughness of the sketch, it checked very well with the skins, though no light was thrown upon the G.E. offers mate food. Copulation. Check sketch with skins. No light on distinguishing sexes.