Cogswell 1949 Chaetura vauxi Aug 8-19 Big Lagoon, Humboldt Co., Calif. way common. They were most in evidence, i.e., more in the air close together, over our camp for about ½ hour, after sunset. The last one usually disappeared shortly before myotis yumanensis appeared in numbers. They were numerous during mid.morning & mid p.m. on several dates along the ridge E. of the lagoon, over the marsh at the S.E. end of the lagoon + about the gravelly stream-bed of Maple Creek 1½ miles inland: one was collected near the log pond on the 13th, a few hundred feet from the inland edge of the tule marsh. Aug.22 "Bald Hills", 2½ mi. NW Schoolhouse Peak, 2500 ft., Humboldt Co. Calif. an estimated 100 or more were flying about over the grain field + stubble fields here, near (+ over) the edge of Douglas Fir forest: many swallows were here also. These were the only swifts seen while we were at French Camp. They were absent from seemingly suitable places in the vicinity of Schoolhouse Peak + on French Camp Ridge. Aug.27 3½ mi. N Willow Creek, 700 ft., Humboldt Co., Calif. I seen over lower Croon Creek canyon. Aug.28 Horse Tints Cr. canyon, 3000ft. ½ mi N, 1 mi E of above locality - about 10 seen in flight over forested slopes. Aug.30,31 2½ mi. N Willow creek, 400 ft., Humboldt Co., Calif. Several seen in flight over woodland, field, gravelly river banks.