explored down the Balim River, finding a suitable landing place for the plane, which was later used as a collecting camp and from which Teerink was flown back to Habbema Lake Auguts 19. The itinerary of the collecting party, including the activities concerning collecting and those from which an idea of the country were formed, follow. It is divided into the two natural parts; the high mountain section and the Idenburg slope section. Mt. Wilhelmina to Grand Valley, 1600 - 4500 meters. Reconnaissance flights were made over this area in June. First landing Habbema Lake, July 15, 1938; last party taken from Balim River, December 19, 1938. Personnel: Brass, Huls, Rand, Richardson, Teerink, and Toxopeus were inland all this period; Archbold for the period August 19 to October 6; van Arcken, Meyer-Dress and Schreuder, September 2 to October 3. We had two brigades of native infantry and Malay and Dyak carriers. We also had Ambonese and Dyak collecting boys. Between July 22 - 31 the whole collecting party was landed at Habbema Lake. This camp was kept open until November 18, and a few specimens were collected here throughout the period by men station- ed there. Intensive collecting of birds was carried on from Rand's arrival, July 30, until August 26, when he went to the 3600 meter camp, spending the night at the intermediate 3400 meter camp, except for an excursion to this 3600 meter camp in company with Brass, Huls and Toxopeus Auguts 15-17. From August 22-24 Toxopeus made an ex- cursion to the site of the 2800 meter camp to the north and collect- ed a few birds. Rand returned to Habbema Lake September 1 to take part in a reconnaissance flight over Mr. Wilhelmina on September 4, and returned to 3600 meters September 5 and 6. Collecting boys were left at the 3600 meter camp to carry on collecting there while