RTH 1964 C. pasitlus 10 june Barrns, Alaska ascent but was silent after it started down In evening - are displaying on Oath's Bluff. 11 june Incredible activity in dren area near old gunset hut. Chase with 2 birds - landed - aggressive (chase) - landed with 1 wing aloft, fice raised to ~450 - returned and boil (1' aways) Chased again, gave rapid heard trill (different in quality from the notebook to their heard + sight's force i gather) - landed again with 1 wing up the round other - tail still half cocked - gave saw still note rapidly. Later I next found - east with 4 eggs - Nenbut I saw was in a low polyg - void scattered grass- sedge cover - nest was lined with grass blocks, set. pieces / lichens. Nest corn - about 60%. Incubation And did not give a distraction display but stayed in close giving a short (2-3 sec) chath - trill - crooped 18-10 notes, given in rapid succession [ch-ch-ch...]- number = quality. This is an excellent call - similar to a duo-it - call I heard - i.e. given near the nest but not in the distraction display. 13 june - Call note in flight - A fork, sharp stereophonic 'kritt' or 'ka-rith'. An aerial harp + very accompaniment (given continuously) for 4 min., 20 sec. + no vocal in song - but voice up pitch on loud and muddied down (i.e. more whip faster [illegible])