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 Mar., 1912 A WEEK AFIELD IN SOUTHERN ARIZONA 61 latus). I spent some time looking for the nests of the latter but was not success- ful. There were, apparently, two pairs of them about one hundred yards apart. The occurrence of this bird at this season was very much of a surprise to me. There were numerous Killdeer along a small stream flowing from a spring in this flat, and I walked up so quietly I almost stepped on one before she saw me and left her nest and three pretty eggs. Several nests of White-necked Raven about ready for eggs were found in the mesquites, but we were a little early for eggs. Resuming our journey we crossed through Mescal gap where we saw Scott Orioles (Icterus parisorum) and Western Lark Sparrows (Chondestes gramrnacus strigatus), but as we were in a hurry to reach the San Pedro river at Fairbanks for a little collecting we did not stop to look for nests. We arrived Fig. 18. NEST OF-GAMBIL QUAIL, AT THE Foot OF A'MESQUITE BUSH there about one o'clock, and after lunch put in the balance of the day along the banks of the river. In a small mixed grove of cottomvoods and xvilloxvs I found txvo nests of Traill Flycatcher (Empidonax trailli) xvith three fresh eggs in each. Also collected a set of four Lucy Warbler eggs from a hole in a loxv dead xvilloxv stump. Incubation xvas far advanced. The female xvas flushed but did not make much of a demonsiration and disappeared entirely before I had finished taking a photograph of the nesting site. Sonora Yellow Warblers xvere quite numerous and I took one set of three eggs from a nest fifteen feet up in a slender villov. Tvo nests of you.ng Costa Hummers (Calypte costae) were also found here. One held newly hatched young and the other, young about grown.