Marshall 1941- 1942 Streptoprocne zonaris Mt. Cacachuaque Dec 25-Jan 6 Seen about every other day - especially on cloudy days - Usually only above the highest peaks but on some days the whole flock would hawk around over the finca & coffee-drying grounds some coming down within 200'. On summit- flock would turn up suddenly about every half hour - coming in rapidly from north east - would circle & rise above the steep south cliff where possibly up-current of air. Then would break up into smaller bands which would make off in different directions or hawk about higher & higher. Small groups would come whistling over the ridge occasionally - when going down - wings would shriek. Twittering notes often given. On day when seen over the hacienda (around noon) the whole sky would be filled with swifts - very loose flock & covering immense territory - yet would all show up or leave at about same time so that 1 min. would see swift in every direction, next min. only 1 or 2 just leaving. (No specimens.)